Physics at the FCC: Workshop Overview Part II (BSM)
Transcript of Physics at the FCC: Workshop Overview Part II (BSM)
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Physics at the FCC: Workshop Overview Part II (BSM)
VLHC Seminar September 2017!
M.J. Ramsey-Musolf U Mass Amherst
http://www.physics.umass.edu/acfi/
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FCC Physics Week
Follow up to M. Mangano’s talk
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Goals For This Talk
• Give a flavor of important BSM opportunities presented at workshop
• Give my own perspective on status so far
• Invite discussion and input
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Outline
I. Context
II. Naturalness & EWSB
III. Cosmology
IV. Neutrinos
V. Outlook
Disclaimer: not all talks included, some interesting topics omitted due to time, mostly focused on material presented at workshop & not comprehensive review of recent work…
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I. Context
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Future Circular Colliders
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CEPC
Parameter DesignGoal
Par$cles e+,e-
Centerofmassenergy 2x120GeV
PeakLuminosity >2x1034/cm2/s
No.ofIP 2
e+ e- LTB
CEPC (50km-100km)
Boostr(50Km-100km)
SppC 50-100Km)
Q. Qin, PANIC 2017, Beijing
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SppC
Parameter Unit Value PreCDR CDR Ul$mate
Circumference km 54.4 100 100 C.M. energy TeV 70.6 75 125-150 Dipole field T 20 12 20-24 Injection energy TeV 2.1 2.1 4.2 Number of IPs 2 2 2 Nominal luminosity per IP cm-2s-1 1.2x1035 1.0x1035 - Beta function at collision m 0.75 0.75 - Circulating beam current A 1.0 0.7 - Bunch separation ns 25 25 - Bunch population 2.0x1011 1.5x1011 - SRpowerperbeam MW 2.1 1.1 - SR heat load per aperture @arc W/m 45 13 -
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Questions for the FCC
• What is the “value added” ?
• What are the synergies/complementarities involving the pp, ee, and ep colliders ?
• Are there well-defined targets in mass reach and precision that would definitively address key open questions ?
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Fundamental Questions
MUST answer SHOULD answer
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Fundamental Questions
MUST answer SHOULD answer
€
H 0
€
H 0
€
ϕNEW
Δ m2 ~ λ Λ2
ΛCosmological11
θQCD , parity, unification...
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Fundamental Questions
MUST answer SHOULD answer
€
H 0
€
H 0
€
ϕNEW
Δ m2 ~ λ Λ2
ΛCosmologicalOrigin of mν
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θQCD , parity, unification...
flavor…
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Scenarios
• Extended scalar sector
• Extended gauge sector
• Additional fermions
• Singlets • Un-colored EW multiplets • Colored scalars
• U(1)’ • Mirror SU(N) • GUTS
• Vector-like • Heavy NR • Gauginos
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Scenarios
• Extended scalar sector
• Extended gauge sector
• Additional fermions
• Singlets • Un-colored EW multiplets • Colored scalars
• U(1)’ • Mirror SU(N) • GUTS
• Vector-like • Heavy NR • Gauginos
Naturalness
Cosmology
Neutrino mass
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔ ✔
✔
✔
✔
✔
✔ ✔
✔
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Signatures & Reach
• New states
• Modifications of SM properties
• New interactions
• Higher energy • Higher parton luminosity • More statistics & bknd reduction • New detectors (LLPs…)
• Precision, precision, precision • “Clean” signals • More statistics
• Symmetry tests: CP, lepton number & flavor, baryon number…
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II. Naturalness & EWSB
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Naturalness
Scenarios Signatures
C. Verhaaren
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Naturalness
Scenarios Signatures
C. Verhaaren
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Naturalness: SUSY & Compositeness Minimal Composite Higgs: Modified W, Z couplings
• LHC: (v/f)2 ~ 0.1
• FCC-ee: (v/f)2 ~ 0.01
SUSY: Look for the cracks…
A. Katz
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Naturalness: SUSY & Higgs
A. Katz
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Naturalness & SUSY
Stop-induced hgg coupling modificaiton
M. McCullough
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Naturalness
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Higgs coupling deviations
ZZh coupling hhh coupling
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Naturalness: Little Hierarchy
A. Katz
( a little bit fuzzy…)
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Naturalness
Scenarios Signatures
C. Verhaaren
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Neutral Naturalness
A. Katz
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Neutral Naturalness
C. Verhaaren
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Neutral Naturalness Exotic Higgs decays
Exotic Higgs decays: h ! 0++ 0++ w/ 2 DV’s or 1 DV +…
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Neutral Naturalness: UV States
Cheng et al 1512.02647
C. Verhaaren
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Neutral Naturalness & Higgs Portal
SM gauge singlet scalars (illustrative of reach)
D. Buttazzo
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EWSB: BSM Higgs
2HDM
S. Su
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EWSB: BSM Higgs
2HDM
S. Su
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EWSB: BSM Higgs
2HDM
S. Su
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Naturalness
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• Value added
• Synergy/complementarity
• Well-defined target in mass and/or precision
Extend reach significantly beyond HL-LHC
Look for correspondence between new states (hh mode) and modified Higgs couplings (ee mode)
Assumptions about “acceptable” fine tuning…
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III. Cosmology
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Dark Sector
• What is the dark matter ?
• What are its interactions ?
• Fermions • Scalars • …
• Scalar mediators • Vector mediators • Contact interactions
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Dark Sector P. Harris
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Dark Sector Beyond Mono-jet + MET
P. Harris
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Dark Sector Beyond Mono-jet + MET
P. Harris
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Dark Sector: EW Multiplets Cirelli & Strumia ‘05
Siganture: Disappearing charge track S+ ! SDM + π+ (soft)
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Dark Sector: EW Multiplets Disappearing charged tracks J.F. Zurita
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Dark Sector: EW Multiplets Disappearing charged tracks J.F. Zurita
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Dark Sector: EW Multiplets Disappearing charged tracks J.F. Zurita
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Dark Sector: EW Multiplets Disappearing charged tracks J.F. Zurita
100 TeV, 3ab-1
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Dark Sector: EW Multiplets Disappearing charged tracks J.F. Zurita
100 TeV, 3ab-1
Is MDM ~ 2-3 TeV reachable ?
Sensitivity
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Dark Sector: EW Multiplets Mono-Z J.F. Zurita
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Dark Sector: EW Multiplets Mono-Z J.F. Zurita
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Dark Sector: EW Multiplets Mono-Z J.F. Zurita
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Dark Sector: Mediators
M. Spannowsky
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Dark Sector: Mediators
M. Spannowsky
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Dark Sector: Mediators
M. Spannowsky
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Dark Sector: Mediators
M. Spannowsky
ILC
Δyee Δyee
Heavy mediator Light mediator
ILC
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Dark Sector: Mediators
M. Spannowsky
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Dark Sector: Mediators Coupling evolution
M. Spannowsky
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Dark Sector
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• Value added
• Synergy/complementarity
• Well-defined target in mass and/or precision
Extend reach significantly beyond HL-LHC
Discovery (hh mode) and interactions (ee and hh modes)
EW multiplets: MDM ~ 2-3 TeV
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Baryogenesis
• Baryon number violation ?
• BSM CPV ?
• Out of Equilibrium ?
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EW Phase Transition: Singlet Scalars
Next gen pp: Kotwal, No, R-M, Winslow 1605.06123 56
SFOEWPT Benchmarks: Resonant di-Higgs & precision Higgs studies
SFOEWPT •
h-S Mixing
m2 ⇡ MN (37)
�(N ! `H) 6= �(N ! ¯`H⇤) (38)
Lmass = y ¯L ˜HNR + h.c. + mN¯NRNC
R (39)
Lmass =
y
⇤
¯LcHHT L + h.c. (40)
�(NR ! `H) 6= �(NR ! ¯`H⇤) (41)
m⌫ =
m2D
MR
(42)
hp0| JEMµ |pi =
¯U(p0)
F1�µ +
iF2
2M�µ⌫q
⌫+
iF3
2M�µ⌫�5q
⌫+
FA
M2(q2�µ � 6qqµ)�5
�U(p) (43)
hp0| JEMµ |piPV =
FA
M2¯U(p0)
⇥(q2�µ � 6qqµ)�5
⇤U(p) (44)
Qquqd = ✏jk¯QjuR
¯QkdR (45)
YB =
nB
s= (8.82± 0.23)⇥ 10
�11(46)
mt̃R⇠ 160 GeV (47)
b¯b�� & 4⌧ (48)
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Next gen pp
LHC
EWPO
MJRM
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EW Phase Transition: Singlet Scalars
?
φ
?
φ
?
F
?
F1st order 2nd order
Profumo, R-M, Wainwright, Winslow: 1407.5342; see also Noble & Perelstein 0711.3018
<S >
m2 > 2 m1
m1 > 2 m2
Mixed States: Precision $ ILC, CPEC, FCC-ee
Modified Higgs Self-Coupling
Increasing mh
New scalars
FCC-hh/SPPC
FCC-ee/ CEPC
HL-LHC ILC
57 MJRM
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EW Phase Transition: Singlet Scalars
?
φ
?
φ
?
F
?
F1st order 2nd order
<S >
Curtain, Meade, Yu: arXiv: 1409.0005
Z2 symmetric real singlet extension
• Loop-induced 1-step transition • 2-step transition for µS
2 < 0
VBF @ 100 TeV pp:
pp ! h jj , h ! invis
2 Step*
1 Step
Significance w/ 3000 fb-1
Non-pert 58 * Singlet two step: see also Profumo, R-M,
Shaugnessy 2007
> 2 σ
MJRM
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EW Phase Transition: DM Direct Detection
?
φ
?
φ
?
F
?
F1st order 2nd order
<S >
Curtain, Meade, Yu: arXiv: 1409.0005
Z2 symmetric real singlet extension
• Loop-induced 1-step transition • 2-step transition for µS
2 < 0
Scalar singlet DM: direct detection
LUX Exclusion
Xenon1T
59 MJRM
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?
φ
?
φ
?
F
?
F1st order 2nd order
Increasing mh
New scalars
EW Multiplets: Two-Step EWPT
<φ0 >
Baryogenesis
Quench sphalerons
Small entropy dilution
φ dark matter
φ0
j
Patel, R-M: arXiv 1212.5652 ; Blinov et al: 1505.05195
• Step 1: thermal loops • Step 2: tree-level barrier
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One step
Two step
MJRM
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?
φ
?
φ
?
F
?
F1st order 2nd order
Increasing mh
New scalars
EW Multiplets: Two-Step EWPT
j
Patel, R-M: arXiv 1212.5652 ; Blinov et al: 1505.05195
<Σ0 >
€
h j γ
γ
Σ+ Trip
let M
ass
Higgs Portal Coupling
Two-step EWB favorable
61
One step
Two step
MJRM
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?
φ
?
φ
?
F
?
F1st order 2nd order
Increasing mh
New scalars
EW Multiplets: Two-Step EWPT
j
Patel, R-M: arXiv 1212.5652 ; Blinov et al: 1505.05195
<Σ0 >
€
h j γ
γ
Σ+ Trip
let M
ass
Higgs Portal Coupling
Two-step EWB favorable
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One step
Two step M. Mangano
FCC-ee: < 2% on δHγγ
MJRM
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EWPT
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• Value added
• Synergy/complementarity
• Well-defined target in mass and/or precision
Extend reach significantly beyond HL-LHC
Look for correspondence between new states (hh mode) and modified Higgs couplings (ee & hh modes)
Singlets: 100 TeV + 30 ab-1
EW Multiplets: < 10% on hγγ
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IV. Neutrino Mass
• RH neutrinos (type I & II see-saw)
• New scalars (LRSM, raditive see-saw)
• Lepton number violation (another day)
ACFI workshop July ‘17: http://www.physics.umass.edu/acfi/seminars-and-workshops/neutrinos-at-the-high-energy-frontier
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RH Sterile Neutrinos
E. Cazzato
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RH Sterile Neutrinos
E. Cazzato
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RH Sterile Neutrinos
E. Cazzato
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RH Sterile Neutrinos
E. Cazzato
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RH Sterile Neutrinos
E. Cazzato
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RH Sterile Neutrinos
O. Fischer, ACFI ‘17 Workshop
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RH Sterile Neutrinos
M. Drewes
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New Scalars & mν
Y. Zhang
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New Scalars & mν
Y. Zhang
Majorana mass
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Neutrino Mass
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• Value added
• Synergy/complementarity
• Well-defined target in mass and/or precision
Extend reach significantly beyond HL-LHC
Probe different regions of (MN , θ ) space; produce new scalars; LNV & LFV @ FCC-hh
Leptogenesis-viable region ?
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V. Outlook - 1
• FCC will provide an exciting opportunity to significantly extend the reach in mass scale and precision, addressing key open questions in fundamental physics
• Different modes (pp, e+e-, e-p ) are richly complementary
• There is considerable room for additional theoretical and experimental study
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V. Outlook - 2
A. Blondel
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V. Outlook - 2
A. Blondel
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V. Outlook - 2
A. Blondel
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Back Up
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Solutions w/ LLP’s: Neutral Naturalness
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Mirror Glueballs
SM
OEFF
Juknevich
cm
m
D. Curtin, C. Verhaaren
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Solutions w/ LLP’s: Neutral Naturalness
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Mirror Glueballs
SM
OEFF
Juknevich
Exotic Higgs decays: h ! 0++ 0++ w/ 2 DV’s or 1 DV +…
D. Curtin, C. Verhaaren
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Dark Sector: Mediators
M. Spannowsky