Neutron disappearance and regeneration from mirror...
Transcript of Neutron disappearance and regeneration from mirror...
Neutron disappearance and regenerationfrom mirror state
Louis VarrianoUniversity of Tennessee Knoxville
International Workshop on Baryonamp Lepton Number Violation
May 17 2017
Mirror matter hypothesis- for a review see L B Okun Phys Usp 50 380-389 (2007)
ndash Mirror matter (MM) is a hypothetical form ofmatter and is a copy of the Standard Modelparticle content in a hidden ldquomirrorrdquo sectorwith identical self-couplings and possibly newinteractions between the two sectors
ndash MM sector has identical forces andself-interacting particles which are dark toordinary matter (OM) with gravity as acommon force
ndash Exact symmetry between the two sectorsmeans no new parameters except forpossible mixing parameters
ndash In Ltot MM might restore global paritybetween left-right in weak sector
Two identical gauge sectors (exSU(5)times SU(5)prime) with identicalfield contents couplings and
LagrangiansLtot = L+ Lprime + Lmix
Lmix could contain new particleinteractions between sectors for
neutral particles (eg γ ν netc)
1 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
ndash No DM has yet been observed despite popularity of existing models andexperimental searches for new particles
ndash Alternative DM models should be explored
ndash MM is a natural dark matter (DM) candidate since its particles do not interactwith OM except through gravity (and perhaps some new mixing force)
ndash MM is currently not excluded by any experiment and is consistent withcosmological observation
- R Foot Int J Mod Phys A 29 1430013 (2014)
ndash MM is similar to OM but because its temperature T prime lt T has sim 25 mirrorH and sim 75 mirror He by mass
- Z Berezhiani Int J Mod Phys A 19 3775 (2004)
2 Neutron disappearance and regeneration from mirror stateLouis Varriano
No DM direct detection experiments of MM yet
3 Neutron disappearance and regeneration from mirror stateLouis Varriano
Neutral particles could oscillate between sectorsndash Free neutrons (no charge and colorless) could oscillate between OM and MM
sectors via new mechanism- Z Berezhiani and L Bento Phys Rev Lett 96 081801 (2006)
ndash nminusnprime could be fast (τnnprime ≳ 1 s) compared to nminusn (τnn gt 24 times 108 s) whichcould be a second-order effect
- A Addazi Z Berezhiani and Y Kamyshkov arXiv160700348 (2016)
4 Neutron disappearance and regeneration from mirror stateLouis Varriano
Magnetic resonance in nminusnprime oscillations- Z Berezhiani Eur Phys J C 64 421-431 (2009)
ndash The nminusnprime Hamiltonian H =
(m+micro(minusrarrσ middotminusrarrB ) 1
τ1τ
m+micro(minusrarrσ middotminusrarrBprime)
)
ndash Enhancement of oscillationprobability if magnetic fieldsin each sector are alignedand same magnitude(ldquoresonancerdquo behavior)
ndash Direction and magnitude ofBprime unknown
ndash When microB ≫ ε thedependence of the probabilityof oscillation on angle βbetween the two magneticfield can be written
Pnrarrnprime(t) =sin2(
microB2 minus microBprime
2
)t
2τ 2(microB2 minus microBprime
2 )2[1 + cos(β)] +
sin2(
microB2 + microBprime
2
)t
2τ 2(microB2 + microBprime
2 )2[1 minus cos(β)]
5 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previous nminusnprime oscillation searches
ndash Three ultra-cold neutron experiments performed previously
1 G Ban et al Phys Rev Lett 99 161603 (2007)
2 A P Serebrov et al Phys Lett B 663 3 181-185 (2008)A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3137-140 (2009)
3 I Altarev et al Phys Rev D 80 032003 (2009)
ndash One neutron beam regeneration-type experiment performedpreviously (unpublished)
1 U Schmidt (Heidelberg) BLNV Workshop 2007
6 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons- A P Serebrov et al Phys Lett B 663 3 181-185 (2008)
- A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3 137-140 (2009)
ndash 190L volume stores sim 500 000 UCN with wallcollision rate of sim 10 per neutron per second
ndash Magnetic field varied sim 0 Gauss or plusmn02Gauss (up or down)
ndash Neutron lifetime in the trap is measured with acycle of 130 s filling 300 s storage and 130 scounting survivors
ndash Comparison of applied magnetic fieldcounting with shielded field (sim 0 G) countingcan reveal nminusnprime effect
ndash Assuming Bprime = 0 nminusnprime oscillation timeτ gt 448s (90 CL)
7 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons
8 Neutron disappearance and regeneration from mirror stateLouis Varriano
Reanalysis discovered magnetic anomaly- Z Berezhiani and F Nesti Eur Phys J C 72 1974 (2012)
ndash Asymmetry
AdetB (t) = NminusB(t)minusNB(t)
NminusB(t)+NB(t)
ndash Reanalysis shows the asymmetryhas a 52σ deviation from zerodependent on the appliedmagnetic field direction
ndash This could be indication ofnon-zero Bprime field present at Earth
ndash Fitted parameter indicate B sim 01G and τβ sim few seconds
ndash A new experiment should beperformed by an alternatemethod to be sensitive to thisanomaly
9 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN experiment with scanning magnetic field- I Altarev et al Phys Rev D 80 032003 (2009)
ndash Scanning over the magnetic field from+125microT to minus125microT in 25microTincrements
ndash Data shows that step size is toocoarse to observe resonance
ndash Data could be fit equally well withstraight line
ndash Low significance fit howeverindicates that Bprime sim 11microT β sim 25τ sim 20 s
ndash Experiment with finer steps inmagnetic field could revealresonance
10 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN scattering can have ambiguous interpretationndash UCN scattering on trap walls
leads to higher losscoefficients than predicted bycalculation - not wellunderstood
- E A Goremychkin and Yu NPokotilovski JGU Mainz
Germany (2016)
ndash Asymmetry anomaly might besome other unexplainedphenomenon not mirrortransformation
ndash Neutron beam regenerationexperiment without neutronreflections eliminatespotentially anomalous effects
11 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previously - cold neutron beam regeneration at B = 0- U Schmidt (Heidelberg) BLNV Workshop 2007
ndash Previous cold neutron beam experiment compared neutron counts with appliedmagnetic field to counts with suppressed zero field
ndash New proposed experiment revives previous beam technique with addedcomponent - scanning over lab magnetic field
ldquoNeutron disappearance and regeneration from mirror staterdquoZ Berezhiani M Frost Y Kamyshkov B Rybolt and L Varriano
arXiv 1703067335 (2017)
12 Neutron disappearance and regeneration from mirror stateLouis Varriano
New proposed regeneration experiment
ndash Proposed regeneration experiment tobe sensitive to τ sim 10 minus 20 sindependent of angle β
ndash Paper examines SNS as possible siteof experiment as an examplerarr Leah Broussard (next) to talkabout real experiment at HFIR
13 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter hypothesis- for a review see L B Okun Phys Usp 50 380-389 (2007)
ndash Mirror matter (MM) is a hypothetical form ofmatter and is a copy of the Standard Modelparticle content in a hidden ldquomirrorrdquo sectorwith identical self-couplings and possibly newinteractions between the two sectors
ndash MM sector has identical forces andself-interacting particles which are dark toordinary matter (OM) with gravity as acommon force
ndash Exact symmetry between the two sectorsmeans no new parameters except forpossible mixing parameters
ndash In Ltot MM might restore global paritybetween left-right in weak sector
Two identical gauge sectors (exSU(5)times SU(5)prime) with identicalfield contents couplings and
LagrangiansLtot = L+ Lprime + Lmix
Lmix could contain new particleinteractions between sectors for
neutral particles (eg γ ν netc)
1 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
ndash No DM has yet been observed despite popularity of existing models andexperimental searches for new particles
ndash Alternative DM models should be explored
ndash MM is a natural dark matter (DM) candidate since its particles do not interactwith OM except through gravity (and perhaps some new mixing force)
ndash MM is currently not excluded by any experiment and is consistent withcosmological observation
- R Foot Int J Mod Phys A 29 1430013 (2014)
ndash MM is similar to OM but because its temperature T prime lt T has sim 25 mirrorH and sim 75 mirror He by mass
- Z Berezhiani Int J Mod Phys A 19 3775 (2004)
2 Neutron disappearance and regeneration from mirror stateLouis Varriano
No DM direct detection experiments of MM yet
3 Neutron disappearance and regeneration from mirror stateLouis Varriano
Neutral particles could oscillate between sectorsndash Free neutrons (no charge and colorless) could oscillate between OM and MM
sectors via new mechanism- Z Berezhiani and L Bento Phys Rev Lett 96 081801 (2006)
ndash nminusnprime could be fast (τnnprime ≳ 1 s) compared to nminusn (τnn gt 24 times 108 s) whichcould be a second-order effect
- A Addazi Z Berezhiani and Y Kamyshkov arXiv160700348 (2016)
4 Neutron disappearance and regeneration from mirror stateLouis Varriano
Magnetic resonance in nminusnprime oscillations- Z Berezhiani Eur Phys J C 64 421-431 (2009)
ndash The nminusnprime Hamiltonian H =
(m+micro(minusrarrσ middotminusrarrB ) 1
τ1τ
m+micro(minusrarrσ middotminusrarrBprime)
)
ndash Enhancement of oscillationprobability if magnetic fieldsin each sector are alignedand same magnitude(ldquoresonancerdquo behavior)
ndash Direction and magnitude ofBprime unknown
ndash When microB ≫ ε thedependence of the probabilityof oscillation on angle βbetween the two magneticfield can be written
Pnrarrnprime(t) =sin2(
microB2 minus microBprime
2
)t
2τ 2(microB2 minus microBprime
2 )2[1 + cos(β)] +
sin2(
microB2 + microBprime
2
)t
2τ 2(microB2 + microBprime
2 )2[1 minus cos(β)]
5 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previous nminusnprime oscillation searches
ndash Three ultra-cold neutron experiments performed previously
1 G Ban et al Phys Rev Lett 99 161603 (2007)
2 A P Serebrov et al Phys Lett B 663 3 181-185 (2008)A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3137-140 (2009)
3 I Altarev et al Phys Rev D 80 032003 (2009)
ndash One neutron beam regeneration-type experiment performedpreviously (unpublished)
1 U Schmidt (Heidelberg) BLNV Workshop 2007
6 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons- A P Serebrov et al Phys Lett B 663 3 181-185 (2008)
- A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3 137-140 (2009)
ndash 190L volume stores sim 500 000 UCN with wallcollision rate of sim 10 per neutron per second
ndash Magnetic field varied sim 0 Gauss or plusmn02Gauss (up or down)
ndash Neutron lifetime in the trap is measured with acycle of 130 s filling 300 s storage and 130 scounting survivors
ndash Comparison of applied magnetic fieldcounting with shielded field (sim 0 G) countingcan reveal nminusnprime effect
ndash Assuming Bprime = 0 nminusnprime oscillation timeτ gt 448s (90 CL)
7 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons
8 Neutron disappearance and regeneration from mirror stateLouis Varriano
Reanalysis discovered magnetic anomaly- Z Berezhiani and F Nesti Eur Phys J C 72 1974 (2012)
ndash Asymmetry
AdetB (t) = NminusB(t)minusNB(t)
NminusB(t)+NB(t)
ndash Reanalysis shows the asymmetryhas a 52σ deviation from zerodependent on the appliedmagnetic field direction
ndash This could be indication ofnon-zero Bprime field present at Earth
ndash Fitted parameter indicate B sim 01G and τβ sim few seconds
ndash A new experiment should beperformed by an alternatemethod to be sensitive to thisanomaly
9 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN experiment with scanning magnetic field- I Altarev et al Phys Rev D 80 032003 (2009)
ndash Scanning over the magnetic field from+125microT to minus125microT in 25microTincrements
ndash Data shows that step size is toocoarse to observe resonance
ndash Data could be fit equally well withstraight line
ndash Low significance fit howeverindicates that Bprime sim 11microT β sim 25τ sim 20 s
ndash Experiment with finer steps inmagnetic field could revealresonance
10 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN scattering can have ambiguous interpretationndash UCN scattering on trap walls
leads to higher losscoefficients than predicted bycalculation - not wellunderstood
- E A Goremychkin and Yu NPokotilovski JGU Mainz
Germany (2016)
ndash Asymmetry anomaly might besome other unexplainedphenomenon not mirrortransformation
ndash Neutron beam regenerationexperiment without neutronreflections eliminatespotentially anomalous effects
11 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previously - cold neutron beam regeneration at B = 0- U Schmidt (Heidelberg) BLNV Workshop 2007
ndash Previous cold neutron beam experiment compared neutron counts with appliedmagnetic field to counts with suppressed zero field
ndash New proposed experiment revives previous beam technique with addedcomponent - scanning over lab magnetic field
ldquoNeutron disappearance and regeneration from mirror staterdquoZ Berezhiani M Frost Y Kamyshkov B Rybolt and L Varriano
arXiv 1703067335 (2017)
12 Neutron disappearance and regeneration from mirror stateLouis Varriano
New proposed regeneration experiment
ndash Proposed regeneration experiment tobe sensitive to τ sim 10 minus 20 sindependent of angle β
ndash Paper examines SNS as possible siteof experiment as an examplerarr Leah Broussard (next) to talkabout real experiment at HFIR
13 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
ndash No DM has yet been observed despite popularity of existing models andexperimental searches for new particles
ndash Alternative DM models should be explored
ndash MM is a natural dark matter (DM) candidate since its particles do not interactwith OM except through gravity (and perhaps some new mixing force)
ndash MM is currently not excluded by any experiment and is consistent withcosmological observation
- R Foot Int J Mod Phys A 29 1430013 (2014)
ndash MM is similar to OM but because its temperature T prime lt T has sim 25 mirrorH and sim 75 mirror He by mass
- Z Berezhiani Int J Mod Phys A 19 3775 (2004)
2 Neutron disappearance and regeneration from mirror stateLouis Varriano
No DM direct detection experiments of MM yet
3 Neutron disappearance and regeneration from mirror stateLouis Varriano
Neutral particles could oscillate between sectorsndash Free neutrons (no charge and colorless) could oscillate between OM and MM
sectors via new mechanism- Z Berezhiani and L Bento Phys Rev Lett 96 081801 (2006)
ndash nminusnprime could be fast (τnnprime ≳ 1 s) compared to nminusn (τnn gt 24 times 108 s) whichcould be a second-order effect
- A Addazi Z Berezhiani and Y Kamyshkov arXiv160700348 (2016)
4 Neutron disappearance and regeneration from mirror stateLouis Varriano
Magnetic resonance in nminusnprime oscillations- Z Berezhiani Eur Phys J C 64 421-431 (2009)
ndash The nminusnprime Hamiltonian H =
(m+micro(minusrarrσ middotminusrarrB ) 1
τ1τ
m+micro(minusrarrσ middotminusrarrBprime)
)
ndash Enhancement of oscillationprobability if magnetic fieldsin each sector are alignedand same magnitude(ldquoresonancerdquo behavior)
ndash Direction and magnitude ofBprime unknown
ndash When microB ≫ ε thedependence of the probabilityof oscillation on angle βbetween the two magneticfield can be written
Pnrarrnprime(t) =sin2(
microB2 minus microBprime
2
)t
2τ 2(microB2 minus microBprime
2 )2[1 + cos(β)] +
sin2(
microB2 + microBprime
2
)t
2τ 2(microB2 + microBprime
2 )2[1 minus cos(β)]
5 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previous nminusnprime oscillation searches
ndash Three ultra-cold neutron experiments performed previously
1 G Ban et al Phys Rev Lett 99 161603 (2007)
2 A P Serebrov et al Phys Lett B 663 3 181-185 (2008)A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3137-140 (2009)
3 I Altarev et al Phys Rev D 80 032003 (2009)
ndash One neutron beam regeneration-type experiment performedpreviously (unpublished)
1 U Schmidt (Heidelberg) BLNV Workshop 2007
6 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons- A P Serebrov et al Phys Lett B 663 3 181-185 (2008)
- A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3 137-140 (2009)
ndash 190L volume stores sim 500 000 UCN with wallcollision rate of sim 10 per neutron per second
ndash Magnetic field varied sim 0 Gauss or plusmn02Gauss (up or down)
ndash Neutron lifetime in the trap is measured with acycle of 130 s filling 300 s storage and 130 scounting survivors
ndash Comparison of applied magnetic fieldcounting with shielded field (sim 0 G) countingcan reveal nminusnprime effect
ndash Assuming Bprime = 0 nminusnprime oscillation timeτ gt 448s (90 CL)
7 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons
8 Neutron disappearance and regeneration from mirror stateLouis Varriano
Reanalysis discovered magnetic anomaly- Z Berezhiani and F Nesti Eur Phys J C 72 1974 (2012)
ndash Asymmetry
AdetB (t) = NminusB(t)minusNB(t)
NminusB(t)+NB(t)
ndash Reanalysis shows the asymmetryhas a 52σ deviation from zerodependent on the appliedmagnetic field direction
ndash This could be indication ofnon-zero Bprime field present at Earth
ndash Fitted parameter indicate B sim 01G and τβ sim few seconds
ndash A new experiment should beperformed by an alternatemethod to be sensitive to thisanomaly
9 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN experiment with scanning magnetic field- I Altarev et al Phys Rev D 80 032003 (2009)
ndash Scanning over the magnetic field from+125microT to minus125microT in 25microTincrements
ndash Data shows that step size is toocoarse to observe resonance
ndash Data could be fit equally well withstraight line
ndash Low significance fit howeverindicates that Bprime sim 11microT β sim 25τ sim 20 s
ndash Experiment with finer steps inmagnetic field could revealresonance
10 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN scattering can have ambiguous interpretationndash UCN scattering on trap walls
leads to higher losscoefficients than predicted bycalculation - not wellunderstood
- E A Goremychkin and Yu NPokotilovski JGU Mainz
Germany (2016)
ndash Asymmetry anomaly might besome other unexplainedphenomenon not mirrortransformation
ndash Neutron beam regenerationexperiment without neutronreflections eliminatespotentially anomalous effects
11 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previously - cold neutron beam regeneration at B = 0- U Schmidt (Heidelberg) BLNV Workshop 2007
ndash Previous cold neutron beam experiment compared neutron counts with appliedmagnetic field to counts with suppressed zero field
ndash New proposed experiment revives previous beam technique with addedcomponent - scanning over lab magnetic field
ldquoNeutron disappearance and regeneration from mirror staterdquoZ Berezhiani M Frost Y Kamyshkov B Rybolt and L Varriano
arXiv 1703067335 (2017)
12 Neutron disappearance and regeneration from mirror stateLouis Varriano
New proposed regeneration experiment
ndash Proposed regeneration experiment tobe sensitive to τ sim 10 minus 20 sindependent of angle β
ndash Paper examines SNS as possible siteof experiment as an examplerarr Leah Broussard (next) to talkabout real experiment at HFIR
13 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
No DM direct detection experiments of MM yet
3 Neutron disappearance and regeneration from mirror stateLouis Varriano
Neutral particles could oscillate between sectorsndash Free neutrons (no charge and colorless) could oscillate between OM and MM
sectors via new mechanism- Z Berezhiani and L Bento Phys Rev Lett 96 081801 (2006)
ndash nminusnprime could be fast (τnnprime ≳ 1 s) compared to nminusn (τnn gt 24 times 108 s) whichcould be a second-order effect
- A Addazi Z Berezhiani and Y Kamyshkov arXiv160700348 (2016)
4 Neutron disappearance and regeneration from mirror stateLouis Varriano
Magnetic resonance in nminusnprime oscillations- Z Berezhiani Eur Phys J C 64 421-431 (2009)
ndash The nminusnprime Hamiltonian H =
(m+micro(minusrarrσ middotminusrarrB ) 1
τ1τ
m+micro(minusrarrσ middotminusrarrBprime)
)
ndash Enhancement of oscillationprobability if magnetic fieldsin each sector are alignedand same magnitude(ldquoresonancerdquo behavior)
ndash Direction and magnitude ofBprime unknown
ndash When microB ≫ ε thedependence of the probabilityof oscillation on angle βbetween the two magneticfield can be written
Pnrarrnprime(t) =sin2(
microB2 minus microBprime
2
)t
2τ 2(microB2 minus microBprime
2 )2[1 + cos(β)] +
sin2(
microB2 + microBprime
2
)t
2τ 2(microB2 + microBprime
2 )2[1 minus cos(β)]
5 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previous nminusnprime oscillation searches
ndash Three ultra-cold neutron experiments performed previously
1 G Ban et al Phys Rev Lett 99 161603 (2007)
2 A P Serebrov et al Phys Lett B 663 3 181-185 (2008)A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3137-140 (2009)
3 I Altarev et al Phys Rev D 80 032003 (2009)
ndash One neutron beam regeneration-type experiment performedpreviously (unpublished)
1 U Schmidt (Heidelberg) BLNV Workshop 2007
6 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons- A P Serebrov et al Phys Lett B 663 3 181-185 (2008)
- A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3 137-140 (2009)
ndash 190L volume stores sim 500 000 UCN with wallcollision rate of sim 10 per neutron per second
ndash Magnetic field varied sim 0 Gauss or plusmn02Gauss (up or down)
ndash Neutron lifetime in the trap is measured with acycle of 130 s filling 300 s storage and 130 scounting survivors
ndash Comparison of applied magnetic fieldcounting with shielded field (sim 0 G) countingcan reveal nminusnprime effect
ndash Assuming Bprime = 0 nminusnprime oscillation timeτ gt 448s (90 CL)
7 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons
8 Neutron disappearance and regeneration from mirror stateLouis Varriano
Reanalysis discovered magnetic anomaly- Z Berezhiani and F Nesti Eur Phys J C 72 1974 (2012)
ndash Asymmetry
AdetB (t) = NminusB(t)minusNB(t)
NminusB(t)+NB(t)
ndash Reanalysis shows the asymmetryhas a 52σ deviation from zerodependent on the appliedmagnetic field direction
ndash This could be indication ofnon-zero Bprime field present at Earth
ndash Fitted parameter indicate B sim 01G and τβ sim few seconds
ndash A new experiment should beperformed by an alternatemethod to be sensitive to thisanomaly
9 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN experiment with scanning magnetic field- I Altarev et al Phys Rev D 80 032003 (2009)
ndash Scanning over the magnetic field from+125microT to minus125microT in 25microTincrements
ndash Data shows that step size is toocoarse to observe resonance
ndash Data could be fit equally well withstraight line
ndash Low significance fit howeverindicates that Bprime sim 11microT β sim 25τ sim 20 s
ndash Experiment with finer steps inmagnetic field could revealresonance
10 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN scattering can have ambiguous interpretationndash UCN scattering on trap walls
leads to higher losscoefficients than predicted bycalculation - not wellunderstood
- E A Goremychkin and Yu NPokotilovski JGU Mainz
Germany (2016)
ndash Asymmetry anomaly might besome other unexplainedphenomenon not mirrortransformation
ndash Neutron beam regenerationexperiment without neutronreflections eliminatespotentially anomalous effects
11 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previously - cold neutron beam regeneration at B = 0- U Schmidt (Heidelberg) BLNV Workshop 2007
ndash Previous cold neutron beam experiment compared neutron counts with appliedmagnetic field to counts with suppressed zero field
ndash New proposed experiment revives previous beam technique with addedcomponent - scanning over lab magnetic field
ldquoNeutron disappearance and regeneration from mirror staterdquoZ Berezhiani M Frost Y Kamyshkov B Rybolt and L Varriano
arXiv 1703067335 (2017)
12 Neutron disappearance and regeneration from mirror stateLouis Varriano
New proposed regeneration experiment
ndash Proposed regeneration experiment tobe sensitive to τ sim 10 minus 20 sindependent of angle β
ndash Paper examines SNS as possible siteof experiment as an examplerarr Leah Broussard (next) to talkabout real experiment at HFIR
13 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
Neutral particles could oscillate between sectorsndash Free neutrons (no charge and colorless) could oscillate between OM and MM
sectors via new mechanism- Z Berezhiani and L Bento Phys Rev Lett 96 081801 (2006)
ndash nminusnprime could be fast (τnnprime ≳ 1 s) compared to nminusn (τnn gt 24 times 108 s) whichcould be a second-order effect
- A Addazi Z Berezhiani and Y Kamyshkov arXiv160700348 (2016)
4 Neutron disappearance and regeneration from mirror stateLouis Varriano
Magnetic resonance in nminusnprime oscillations- Z Berezhiani Eur Phys J C 64 421-431 (2009)
ndash The nminusnprime Hamiltonian H =
(m+micro(minusrarrσ middotminusrarrB ) 1
τ1τ
m+micro(minusrarrσ middotminusrarrBprime)
)
ndash Enhancement of oscillationprobability if magnetic fieldsin each sector are alignedand same magnitude(ldquoresonancerdquo behavior)
ndash Direction and magnitude ofBprime unknown
ndash When microB ≫ ε thedependence of the probabilityof oscillation on angle βbetween the two magneticfield can be written
Pnrarrnprime(t) =sin2(
microB2 minus microBprime
2
)t
2τ 2(microB2 minus microBprime
2 )2[1 + cos(β)] +
sin2(
microB2 + microBprime
2
)t
2τ 2(microB2 + microBprime
2 )2[1 minus cos(β)]
5 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previous nminusnprime oscillation searches
ndash Three ultra-cold neutron experiments performed previously
1 G Ban et al Phys Rev Lett 99 161603 (2007)
2 A P Serebrov et al Phys Lett B 663 3 181-185 (2008)A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3137-140 (2009)
3 I Altarev et al Phys Rev D 80 032003 (2009)
ndash One neutron beam regeneration-type experiment performedpreviously (unpublished)
1 U Schmidt (Heidelberg) BLNV Workshop 2007
6 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons- A P Serebrov et al Phys Lett B 663 3 181-185 (2008)
- A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3 137-140 (2009)
ndash 190L volume stores sim 500 000 UCN with wallcollision rate of sim 10 per neutron per second
ndash Magnetic field varied sim 0 Gauss or plusmn02Gauss (up or down)
ndash Neutron lifetime in the trap is measured with acycle of 130 s filling 300 s storage and 130 scounting survivors
ndash Comparison of applied magnetic fieldcounting with shielded field (sim 0 G) countingcan reveal nminusnprime effect
ndash Assuming Bprime = 0 nminusnprime oscillation timeτ gt 448s (90 CL)
7 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons
8 Neutron disappearance and regeneration from mirror stateLouis Varriano
Reanalysis discovered magnetic anomaly- Z Berezhiani and F Nesti Eur Phys J C 72 1974 (2012)
ndash Asymmetry
AdetB (t) = NminusB(t)minusNB(t)
NminusB(t)+NB(t)
ndash Reanalysis shows the asymmetryhas a 52σ deviation from zerodependent on the appliedmagnetic field direction
ndash This could be indication ofnon-zero Bprime field present at Earth
ndash Fitted parameter indicate B sim 01G and τβ sim few seconds
ndash A new experiment should beperformed by an alternatemethod to be sensitive to thisanomaly
9 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN experiment with scanning magnetic field- I Altarev et al Phys Rev D 80 032003 (2009)
ndash Scanning over the magnetic field from+125microT to minus125microT in 25microTincrements
ndash Data shows that step size is toocoarse to observe resonance
ndash Data could be fit equally well withstraight line
ndash Low significance fit howeverindicates that Bprime sim 11microT β sim 25τ sim 20 s
ndash Experiment with finer steps inmagnetic field could revealresonance
10 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN scattering can have ambiguous interpretationndash UCN scattering on trap walls
leads to higher losscoefficients than predicted bycalculation - not wellunderstood
- E A Goremychkin and Yu NPokotilovski JGU Mainz
Germany (2016)
ndash Asymmetry anomaly might besome other unexplainedphenomenon not mirrortransformation
ndash Neutron beam regenerationexperiment without neutronreflections eliminatespotentially anomalous effects
11 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previously - cold neutron beam regeneration at B = 0- U Schmidt (Heidelberg) BLNV Workshop 2007
ndash Previous cold neutron beam experiment compared neutron counts with appliedmagnetic field to counts with suppressed zero field
ndash New proposed experiment revives previous beam technique with addedcomponent - scanning over lab magnetic field
ldquoNeutron disappearance and regeneration from mirror staterdquoZ Berezhiani M Frost Y Kamyshkov B Rybolt and L Varriano
arXiv 1703067335 (2017)
12 Neutron disappearance and regeneration from mirror stateLouis Varriano
New proposed regeneration experiment
ndash Proposed regeneration experiment tobe sensitive to τ sim 10 minus 20 sindependent of angle β
ndash Paper examines SNS as possible siteof experiment as an examplerarr Leah Broussard (next) to talkabout real experiment at HFIR
13 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
Magnetic resonance in nminusnprime oscillations- Z Berezhiani Eur Phys J C 64 421-431 (2009)
ndash The nminusnprime Hamiltonian H =
(m+micro(minusrarrσ middotminusrarrB ) 1
τ1τ
m+micro(minusrarrσ middotminusrarrBprime)
)
ndash Enhancement of oscillationprobability if magnetic fieldsin each sector are alignedand same magnitude(ldquoresonancerdquo behavior)
ndash Direction and magnitude ofBprime unknown
ndash When microB ≫ ε thedependence of the probabilityof oscillation on angle βbetween the two magneticfield can be written
Pnrarrnprime(t) =sin2(
microB2 minus microBprime
2
)t
2τ 2(microB2 minus microBprime
2 )2[1 + cos(β)] +
sin2(
microB2 + microBprime
2
)t
2τ 2(microB2 + microBprime
2 )2[1 minus cos(β)]
5 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previous nminusnprime oscillation searches
ndash Three ultra-cold neutron experiments performed previously
1 G Ban et al Phys Rev Lett 99 161603 (2007)
2 A P Serebrov et al Phys Lett B 663 3 181-185 (2008)A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3137-140 (2009)
3 I Altarev et al Phys Rev D 80 032003 (2009)
ndash One neutron beam regeneration-type experiment performedpreviously (unpublished)
1 U Schmidt (Heidelberg) BLNV Workshop 2007
6 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons- A P Serebrov et al Phys Lett B 663 3 181-185 (2008)
- A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3 137-140 (2009)
ndash 190L volume stores sim 500 000 UCN with wallcollision rate of sim 10 per neutron per second
ndash Magnetic field varied sim 0 Gauss or plusmn02Gauss (up or down)
ndash Neutron lifetime in the trap is measured with acycle of 130 s filling 300 s storage and 130 scounting survivors
ndash Comparison of applied magnetic fieldcounting with shielded field (sim 0 G) countingcan reveal nminusnprime effect
ndash Assuming Bprime = 0 nminusnprime oscillation timeτ gt 448s (90 CL)
7 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons
8 Neutron disappearance and regeneration from mirror stateLouis Varriano
Reanalysis discovered magnetic anomaly- Z Berezhiani and F Nesti Eur Phys J C 72 1974 (2012)
ndash Asymmetry
AdetB (t) = NminusB(t)minusNB(t)
NminusB(t)+NB(t)
ndash Reanalysis shows the asymmetryhas a 52σ deviation from zerodependent on the appliedmagnetic field direction
ndash This could be indication ofnon-zero Bprime field present at Earth
ndash Fitted parameter indicate B sim 01G and τβ sim few seconds
ndash A new experiment should beperformed by an alternatemethod to be sensitive to thisanomaly
9 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN experiment with scanning magnetic field- I Altarev et al Phys Rev D 80 032003 (2009)
ndash Scanning over the magnetic field from+125microT to minus125microT in 25microTincrements
ndash Data shows that step size is toocoarse to observe resonance
ndash Data could be fit equally well withstraight line
ndash Low significance fit howeverindicates that Bprime sim 11microT β sim 25τ sim 20 s
ndash Experiment with finer steps inmagnetic field could revealresonance
10 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN scattering can have ambiguous interpretationndash UCN scattering on trap walls
leads to higher losscoefficients than predicted bycalculation - not wellunderstood
- E A Goremychkin and Yu NPokotilovski JGU Mainz
Germany (2016)
ndash Asymmetry anomaly might besome other unexplainedphenomenon not mirrortransformation
ndash Neutron beam regenerationexperiment without neutronreflections eliminatespotentially anomalous effects
11 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previously - cold neutron beam regeneration at B = 0- U Schmidt (Heidelberg) BLNV Workshop 2007
ndash Previous cold neutron beam experiment compared neutron counts with appliedmagnetic field to counts with suppressed zero field
ndash New proposed experiment revives previous beam technique with addedcomponent - scanning over lab magnetic field
ldquoNeutron disappearance and regeneration from mirror staterdquoZ Berezhiani M Frost Y Kamyshkov B Rybolt and L Varriano
arXiv 1703067335 (2017)
12 Neutron disappearance and regeneration from mirror stateLouis Varriano
New proposed regeneration experiment
ndash Proposed regeneration experiment tobe sensitive to τ sim 10 minus 20 sindependent of angle β
ndash Paper examines SNS as possible siteof experiment as an examplerarr Leah Broussard (next) to talkabout real experiment at HFIR
13 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previous nminusnprime oscillation searches
ndash Three ultra-cold neutron experiments performed previously
1 G Ban et al Phys Rev Lett 99 161603 (2007)
2 A P Serebrov et al Phys Lett B 663 3 181-185 (2008)A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3137-140 (2009)
3 I Altarev et al Phys Rev D 80 032003 (2009)
ndash One neutron beam regeneration-type experiment performedpreviously (unpublished)
1 U Schmidt (Heidelberg) BLNV Workshop 2007
6 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons- A P Serebrov et al Phys Lett B 663 3 181-185 (2008)
- A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3 137-140 (2009)
ndash 190L volume stores sim 500 000 UCN with wallcollision rate of sim 10 per neutron per second
ndash Magnetic field varied sim 0 Gauss or plusmn02Gauss (up or down)
ndash Neutron lifetime in the trap is measured with acycle of 130 s filling 300 s storage and 130 scounting survivors
ndash Comparison of applied magnetic fieldcounting with shielded field (sim 0 G) countingcan reveal nminusnprime effect
ndash Assuming Bprime = 0 nminusnprime oscillation timeτ gt 448s (90 CL)
7 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons
8 Neutron disappearance and regeneration from mirror stateLouis Varriano
Reanalysis discovered magnetic anomaly- Z Berezhiani and F Nesti Eur Phys J C 72 1974 (2012)
ndash Asymmetry
AdetB (t) = NminusB(t)minusNB(t)
NminusB(t)+NB(t)
ndash Reanalysis shows the asymmetryhas a 52σ deviation from zerodependent on the appliedmagnetic field direction
ndash This could be indication ofnon-zero Bprime field present at Earth
ndash Fitted parameter indicate B sim 01G and τβ sim few seconds
ndash A new experiment should beperformed by an alternatemethod to be sensitive to thisanomaly
9 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN experiment with scanning magnetic field- I Altarev et al Phys Rev D 80 032003 (2009)
ndash Scanning over the magnetic field from+125microT to minus125microT in 25microTincrements
ndash Data shows that step size is toocoarse to observe resonance
ndash Data could be fit equally well withstraight line
ndash Low significance fit howeverindicates that Bprime sim 11microT β sim 25τ sim 20 s
ndash Experiment with finer steps inmagnetic field could revealresonance
10 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN scattering can have ambiguous interpretationndash UCN scattering on trap walls
leads to higher losscoefficients than predicted bycalculation - not wellunderstood
- E A Goremychkin and Yu NPokotilovski JGU Mainz
Germany (2016)
ndash Asymmetry anomaly might besome other unexplainedphenomenon not mirrortransformation
ndash Neutron beam regenerationexperiment without neutronreflections eliminatespotentially anomalous effects
11 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previously - cold neutron beam regeneration at B = 0- U Schmidt (Heidelberg) BLNV Workshop 2007
ndash Previous cold neutron beam experiment compared neutron counts with appliedmagnetic field to counts with suppressed zero field
ndash New proposed experiment revives previous beam technique with addedcomponent - scanning over lab magnetic field
ldquoNeutron disappearance and regeneration from mirror staterdquoZ Berezhiani M Frost Y Kamyshkov B Rybolt and L Varriano
arXiv 1703067335 (2017)
12 Neutron disappearance and regeneration from mirror stateLouis Varriano
New proposed regeneration experiment
ndash Proposed regeneration experiment tobe sensitive to τ sim 10 minus 20 sindependent of angle β
ndash Paper examines SNS as possible siteof experiment as an examplerarr Leah Broussard (next) to talkabout real experiment at HFIR
13 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons- A P Serebrov et al Phys Lett B 663 3 181-185 (2008)
- A P Serebrov et al Nucl Instr Meth Phys Res 611 2-3 137-140 (2009)
ndash 190L volume stores sim 500 000 UCN with wallcollision rate of sim 10 per neutron per second
ndash Magnetic field varied sim 0 Gauss or plusmn02Gauss (up or down)
ndash Neutron lifetime in the trap is measured with acycle of 130 s filling 300 s storage and 130 scounting survivors
ndash Comparison of applied magnetic fieldcounting with shielded field (sim 0 G) countingcan reveal nminusnprime effect
ndash Assuming Bprime = 0 nminusnprime oscillation timeτ gt 448s (90 CL)
7 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons
8 Neutron disappearance and regeneration from mirror stateLouis Varriano
Reanalysis discovered magnetic anomaly- Z Berezhiani and F Nesti Eur Phys J C 72 1974 (2012)
ndash Asymmetry
AdetB (t) = NminusB(t)minusNB(t)
NminusB(t)+NB(t)
ndash Reanalysis shows the asymmetryhas a 52σ deviation from zerodependent on the appliedmagnetic field direction
ndash This could be indication ofnon-zero Bprime field present at Earth
ndash Fitted parameter indicate B sim 01G and τβ sim few seconds
ndash A new experiment should beperformed by an alternatemethod to be sensitive to thisanomaly
9 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN experiment with scanning magnetic field- I Altarev et al Phys Rev D 80 032003 (2009)
ndash Scanning over the magnetic field from+125microT to minus125microT in 25microTincrements
ndash Data shows that step size is toocoarse to observe resonance
ndash Data could be fit equally well withstraight line
ndash Low significance fit howeverindicates that Bprime sim 11microT β sim 25τ sim 20 s
ndash Experiment with finer steps inmagnetic field could revealresonance
10 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN scattering can have ambiguous interpretationndash UCN scattering on trap walls
leads to higher losscoefficients than predicted bycalculation - not wellunderstood
- E A Goremychkin and Yu NPokotilovski JGU Mainz
Germany (2016)
ndash Asymmetry anomaly might besome other unexplainedphenomenon not mirrortransformation
ndash Neutron beam regenerationexperiment without neutronreflections eliminatespotentially anomalous effects
11 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previously - cold neutron beam regeneration at B = 0- U Schmidt (Heidelberg) BLNV Workshop 2007
ndash Previous cold neutron beam experiment compared neutron counts with appliedmagnetic field to counts with suppressed zero field
ndash New proposed experiment revives previous beam technique with addedcomponent - scanning over lab magnetic field
ldquoNeutron disappearance and regeneration from mirror staterdquoZ Berezhiani M Frost Y Kamyshkov B Rybolt and L Varriano
arXiv 1703067335 (2017)
12 Neutron disappearance and regeneration from mirror stateLouis Varriano
New proposed regeneration experiment
ndash Proposed regeneration experiment tobe sensitive to τ sim 10 minus 20 sindependent of angle β
ndash Paper examines SNS as possible siteof experiment as an examplerarr Leah Broussard (next) to talkabout real experiment at HFIR
13 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
Most persuasive experiment with ultra-cold neutrons
8 Neutron disappearance and regeneration from mirror stateLouis Varriano
Reanalysis discovered magnetic anomaly- Z Berezhiani and F Nesti Eur Phys J C 72 1974 (2012)
ndash Asymmetry
AdetB (t) = NminusB(t)minusNB(t)
NminusB(t)+NB(t)
ndash Reanalysis shows the asymmetryhas a 52σ deviation from zerodependent on the appliedmagnetic field direction
ndash This could be indication ofnon-zero Bprime field present at Earth
ndash Fitted parameter indicate B sim 01G and τβ sim few seconds
ndash A new experiment should beperformed by an alternatemethod to be sensitive to thisanomaly
9 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN experiment with scanning magnetic field- I Altarev et al Phys Rev D 80 032003 (2009)
ndash Scanning over the magnetic field from+125microT to minus125microT in 25microTincrements
ndash Data shows that step size is toocoarse to observe resonance
ndash Data could be fit equally well withstraight line
ndash Low significance fit howeverindicates that Bprime sim 11microT β sim 25τ sim 20 s
ndash Experiment with finer steps inmagnetic field could revealresonance
10 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN scattering can have ambiguous interpretationndash UCN scattering on trap walls
leads to higher losscoefficients than predicted bycalculation - not wellunderstood
- E A Goremychkin and Yu NPokotilovski JGU Mainz
Germany (2016)
ndash Asymmetry anomaly might besome other unexplainedphenomenon not mirrortransformation
ndash Neutron beam regenerationexperiment without neutronreflections eliminatespotentially anomalous effects
11 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previously - cold neutron beam regeneration at B = 0- U Schmidt (Heidelberg) BLNV Workshop 2007
ndash Previous cold neutron beam experiment compared neutron counts with appliedmagnetic field to counts with suppressed zero field
ndash New proposed experiment revives previous beam technique with addedcomponent - scanning over lab magnetic field
ldquoNeutron disappearance and regeneration from mirror staterdquoZ Berezhiani M Frost Y Kamyshkov B Rybolt and L Varriano
arXiv 1703067335 (2017)
12 Neutron disappearance and regeneration from mirror stateLouis Varriano
New proposed regeneration experiment
ndash Proposed regeneration experiment tobe sensitive to τ sim 10 minus 20 sindependent of angle β
ndash Paper examines SNS as possible siteof experiment as an examplerarr Leah Broussard (next) to talkabout real experiment at HFIR
13 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
Reanalysis discovered magnetic anomaly- Z Berezhiani and F Nesti Eur Phys J C 72 1974 (2012)
ndash Asymmetry
AdetB (t) = NminusB(t)minusNB(t)
NminusB(t)+NB(t)
ndash Reanalysis shows the asymmetryhas a 52σ deviation from zerodependent on the appliedmagnetic field direction
ndash This could be indication ofnon-zero Bprime field present at Earth
ndash Fitted parameter indicate B sim 01G and τβ sim few seconds
ndash A new experiment should beperformed by an alternatemethod to be sensitive to thisanomaly
9 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN experiment with scanning magnetic field- I Altarev et al Phys Rev D 80 032003 (2009)
ndash Scanning over the magnetic field from+125microT to minus125microT in 25microTincrements
ndash Data shows that step size is toocoarse to observe resonance
ndash Data could be fit equally well withstraight line
ndash Low significance fit howeverindicates that Bprime sim 11microT β sim 25τ sim 20 s
ndash Experiment with finer steps inmagnetic field could revealresonance
10 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN scattering can have ambiguous interpretationndash UCN scattering on trap walls
leads to higher losscoefficients than predicted bycalculation - not wellunderstood
- E A Goremychkin and Yu NPokotilovski JGU Mainz
Germany (2016)
ndash Asymmetry anomaly might besome other unexplainedphenomenon not mirrortransformation
ndash Neutron beam regenerationexperiment without neutronreflections eliminatespotentially anomalous effects
11 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previously - cold neutron beam regeneration at B = 0- U Schmidt (Heidelberg) BLNV Workshop 2007
ndash Previous cold neutron beam experiment compared neutron counts with appliedmagnetic field to counts with suppressed zero field
ndash New proposed experiment revives previous beam technique with addedcomponent - scanning over lab magnetic field
ldquoNeutron disappearance and regeneration from mirror staterdquoZ Berezhiani M Frost Y Kamyshkov B Rybolt and L Varriano
arXiv 1703067335 (2017)
12 Neutron disappearance and regeneration from mirror stateLouis Varriano
New proposed regeneration experiment
ndash Proposed regeneration experiment tobe sensitive to τ sim 10 minus 20 sindependent of angle β
ndash Paper examines SNS as possible siteof experiment as an examplerarr Leah Broussard (next) to talkabout real experiment at HFIR
13 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN experiment with scanning magnetic field- I Altarev et al Phys Rev D 80 032003 (2009)
ndash Scanning over the magnetic field from+125microT to minus125microT in 25microTincrements
ndash Data shows that step size is toocoarse to observe resonance
ndash Data could be fit equally well withstraight line
ndash Low significance fit howeverindicates that Bprime sim 11microT β sim 25τ sim 20 s
ndash Experiment with finer steps inmagnetic field could revealresonance
10 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN scattering can have ambiguous interpretationndash UCN scattering on trap walls
leads to higher losscoefficients than predicted bycalculation - not wellunderstood
- E A Goremychkin and Yu NPokotilovski JGU Mainz
Germany (2016)
ndash Asymmetry anomaly might besome other unexplainedphenomenon not mirrortransformation
ndash Neutron beam regenerationexperiment without neutronreflections eliminatespotentially anomalous effects
11 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previously - cold neutron beam regeneration at B = 0- U Schmidt (Heidelberg) BLNV Workshop 2007
ndash Previous cold neutron beam experiment compared neutron counts with appliedmagnetic field to counts with suppressed zero field
ndash New proposed experiment revives previous beam technique with addedcomponent - scanning over lab magnetic field
ldquoNeutron disappearance and regeneration from mirror staterdquoZ Berezhiani M Frost Y Kamyshkov B Rybolt and L Varriano
arXiv 1703067335 (2017)
12 Neutron disappearance and regeneration from mirror stateLouis Varriano
New proposed regeneration experiment
ndash Proposed regeneration experiment tobe sensitive to τ sim 10 minus 20 sindependent of angle β
ndash Paper examines SNS as possible siteof experiment as an examplerarr Leah Broussard (next) to talkabout real experiment at HFIR
13 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
UCN scattering can have ambiguous interpretationndash UCN scattering on trap walls
leads to higher losscoefficients than predicted bycalculation - not wellunderstood
- E A Goremychkin and Yu NPokotilovski JGU Mainz
Germany (2016)
ndash Asymmetry anomaly might besome other unexplainedphenomenon not mirrortransformation
ndash Neutron beam regenerationexperiment without neutronreflections eliminatespotentially anomalous effects
11 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previously - cold neutron beam regeneration at B = 0- U Schmidt (Heidelberg) BLNV Workshop 2007
ndash Previous cold neutron beam experiment compared neutron counts with appliedmagnetic field to counts with suppressed zero field
ndash New proposed experiment revives previous beam technique with addedcomponent - scanning over lab magnetic field
ldquoNeutron disappearance and regeneration from mirror staterdquoZ Berezhiani M Frost Y Kamyshkov B Rybolt and L Varriano
arXiv 1703067335 (2017)
12 Neutron disappearance and regeneration from mirror stateLouis Varriano
New proposed regeneration experiment
ndash Proposed regeneration experiment tobe sensitive to τ sim 10 minus 20 sindependent of angle β
ndash Paper examines SNS as possible siteof experiment as an examplerarr Leah Broussard (next) to talkabout real experiment at HFIR
13 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
Previously - cold neutron beam regeneration at B = 0- U Schmidt (Heidelberg) BLNV Workshop 2007
ndash Previous cold neutron beam experiment compared neutron counts with appliedmagnetic field to counts with suppressed zero field
ndash New proposed experiment revives previous beam technique with addedcomponent - scanning over lab magnetic field
ldquoNeutron disappearance and regeneration from mirror staterdquoZ Berezhiani M Frost Y Kamyshkov B Rybolt and L Varriano
arXiv 1703067335 (2017)
12 Neutron disappearance and regeneration from mirror stateLouis Varriano
New proposed regeneration experiment
ndash Proposed regeneration experiment tobe sensitive to τ sim 10 minus 20 sindependent of angle β
ndash Paper examines SNS as possible siteof experiment as an examplerarr Leah Broussard (next) to talkabout real experiment at HFIR
13 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
New proposed regeneration experiment
ndash Proposed regeneration experiment tobe sensitive to τ sim 10 minus 20 sindependent of angle β
ndash Paper examines SNS as possible siteof experiment as an examplerarr Leah Broussard (next) to talkabout real experiment at HFIR
13 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
Conclusions
ndash Mirror matter offers an attractive theory to help explain several big problems inphysics including nature of dark matter and could also shed light on thebaryonic asymmetry problem
- Z Berezhiani arXiv160208599 (2016)
ndash A neutron regeneration experiment can check the anomalous UCN signalunambiguously with good control of magnetic fields and by eliminating neutronwall reflections which lack a satisfactory theoretical understanding
ndash The unique character of the resonance signal is different than simplymeasuring a UCN asymmetry which might be attributed to different effects
ndash By enhancingsuppressing the resonance signal it could be possible todetermine mirror magnetic field vector at Earth
14 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
Questions
ndash Thanks to the paper co-authors Z Berezhiani M Frost Y Kamyshkov and BRybolt
ndash Thanks to B Kerbikov L Broussard and J Barrow for many usefuldiscussions as well as the nminusnprime collaboration currently working on therealization of this experiment at HFIR
15 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
Mirror matter as dark matter
- T Tait Snowmass 2013
17 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano
Parameters affecting experiment
nminusnprime disappearance is influenced by six parameters
ndash τ - nminusnprime oscillation period
ndash B - lab magnetic field strength
ndash Bprime - mirror magnetic field strength
ndash β - angle between lab magnetic field and mirror magnetic field
ndash φ isin C - Fermi pseudo-potential of residual lab gas (H2)rArr residual gas pressure
ndash φprime isin C - Fermi pseudo-potential of mirror gas (Hprime2 or Hprime
2)rArr mirror gas pressure (neglected here)
18 Neutron disappearance and regeneration from mirror stateLouis Varriano