Staging strategy of E15 - KEKnuclpart.kek.jp/pac/1101/pdf/pac2011.pdf · E15 staging strategy...
Transcript of Staging strategy of E15 - KEKnuclpart.kek.jp/pac/1101/pdf/pac2011.pdf · E15 staging strategy...
M. IwasakiRIKEN Nishina Center & TITech
Staging strategy of E15
for J-PARC E15 Collaboration
2011年1月15日土曜日
K- 3He K-pp
Λ
neutron
proton
proton
π−
decay
formation
at 1 GeV/c by bothmissing & invariant mass
K- 3He -> “ pp K- ” + n
E15: KN interaction study by nuclear bound state-
2011年1月15日土曜日
E15 staging strategy E151st ~ 30kW*week
2011年1月15日土曜日
E15 staging strategy E151st ~ 30kW*week
motivated by
2011年1月15日土曜日
1) Production cross sectioncan be as large as
few mb/sr in bound region!
E15 staging strategy E151st ~ 30kW*week
motivated by
2011年1月15日土曜日
T. Koike, T. Harada, Phys. Rev. C80, 055208 (2009)
1) Production cross sectioncan be as large as
few mb/sr in bound region!
E15 staging strategy E151st ~ 30kW*week
motivated by
2011年1月15日土曜日
T. Koike, T. Harada, Phys. Rev. C80, 055208 (2009)
1) Production cross sectioncan be as large as
few mb/sr in bound region!
E15 staging strategy E151st ~ 30kW*week
2) DISTO DATA
motivated by
2011年1月15日土曜日
T. Koike, T. Harada, Phys. Rev. C80, 055208 (2009)
1) Production cross sectioncan be as large as
few mb/sr in bound region!
E15 staging strategy E151st ~ 30kW*week
2) DISTO DATAT. Yamazaki, M. Maggiora, P. Kienle, et al, PRL 104, 132502 (2010)
motivated by
2011年1月15日土曜日
T. Koike, T. Harada, Phys. Rev. C80, 055208 (2009)
1) Production cross sectioncan be as large as
few mb/sr in bound region!
E15 staging strategy E151st ~ 30kW*week
2) DISTO DATAT. Yamazaki, M. Maggiora, P. Kienle, et al, PRL 104, 132502 (2010)
3) Background Study
motivated by
2011年1月15日土曜日
Production cross section (KH)T. Koike, T. Harada, Phys. Rev. C80, 055208 (2009)
K-pp N,,,,
K-pp YN,,,,
K-pp total,,,,
V0 = -344 W0 = -203 MeV
K-pp N,,,,
(SGM)
K-pp total,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
V0 = -404 W0 = -213 MeV
-150 -100 -50 0 50E ( MeV )
K-pp N,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
-150 -100 -50 0 500
20
40
60
E ( MeV )
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(FINUDA)
K-pp N,,,,K-pp N
,, ,,K-pp YN,,,,
K-pp total,,,,
V0 = -292 W0 = -107 MeV(YA)B( N) = 0.7
B(YN) = 0.2
1B( N) = 0.11
2
K-pp N,,,,
K-pp N,,,,K-pp YN,,,,
K-pp total,,,,
V0 = -237 W0 = -128 MeVB( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
0
20
40
60
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(DHW)
DHW: A. Dote, T. Hyodo, and W. Weise, Nucl. Phys. A804, 197 (2008); Phys. Rev. C79, 014003 (2009).
YA: T. Yamazaki and Y. Akaishi, Phys. Lett. B535, 70 (2002); Proc. Jpn. Academy, Series B 83, 144 (2007)
SGM: N.V. Shevchenko, A. Gal, and J. Mares, Phys. Rev. Lett. 98, 082301 (2007);N.V. Shevchenko, A. Gal, J. Mares, and J. Revai, Phys. Rev. C76, 044004 (2007).
˘
˘
FINUDA: M. Agnello et al., Phys. Rev. Lett. 94, 212303 (2005).
3He (K-, n) X @ 1 GeV/c Excluding K- escape process
2011年1月15日土曜日
Production cross section (KH)T. Koike, T. Harada, Phys. Rev. C80, 055208 (2009)
K-pp N,,,,
K-pp YN,,,,
K-pp total,,,,
V0 = -344 W0 = -203 MeV
K-pp N,,,,
(SGM)
K-pp total,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
V0 = -404 W0 = -213 MeV
-150 -100 -50 0 50E ( MeV )
K-pp N,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
-150 -100 -50 0 500
20
40
60
E ( MeV )
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(FINUDA)
K-pp N,,,,K-pp N
,, ,,K-pp YN,,,,
K-pp total,,,,
V0 = -292 W0 = -107 MeV(YA)B( N) = 0.7
B(YN) = 0.2
1B( N) = 0.11
2
K-pp N,,,,
K-pp N,,,,K-pp YN,,,,
K-pp total,,,,
V0 = -237 W0 = -128 MeVB( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
0
20
40
60
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(DHW)
DHW: A. Dote, T. Hyodo, and W. Weise, Nucl. Phys. A804, 197 (2008); Phys. Rev. C79, 014003 (2009).
YA: T. Yamazaki and Y. Akaishi, Phys. Lett. B535, 70 (2002); Proc. Jpn. Academy, Series B 83, 144 (2007)
SGM: N.V. Shevchenko, A. Gal, and J. Mares, Phys. Rev. Lett. 98, 082301 (2007);N.V. Shevchenko, A. Gal, J. Mares, and J. Revai, Phys. Rev. C76, 044004 (2007).
˘
˘
FINUDA: M. Agnello et al., Phys. Rev. Lett. 94, 212303 (2005).
3He (K-, n) X @ 1 GeV/c Excluding K- escape process
few mb/sr in bound region!cf. 10 μb/sr assumed in prop.
2011年1月15日土曜日
Production cross section (KH)T. Koike, T. Harada, Phys. Rev. C80, 055208 (2009)
K-pp N,,,,
K-pp YN,,,,
K-pp total,,,,
V0 = -344 W0 = -203 MeV
K-pp N,,,,
(SGM)
K-pp total,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
V0 = -404 W0 = -213 MeV
-150 -100 -50 0 50E ( MeV )
K-pp N,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
-150 -100 -50 0 500
20
40
60
E ( MeV )
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(FINUDA)
K-pp N,,,,K-pp N
,, ,,K-pp YN,,,,
K-pp total,,,,
V0 = -292 W0 = -107 MeV(YA)B( N) = 0.7
B(YN) = 0.2
1B( N) = 0.11
2
K-pp N,,,,
K-pp N,,,,K-pp YN,,,,
K-pp total,,,,
V0 = -237 W0 = -128 MeVB( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
0
20
40
60
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(DHW)
3He (K-, n) X @ 1 GeV/c Excluding K- escape process
few mb/sr in bound region!cf. 10 μb/sr assumed in prop.
2011年1月15日土曜日
Production cross section (KH)T. Koike, T. Harada, Phys. Rev. C80, 055208 (2009)
K-pp N,,,,
K-pp YN,,,,
K-pp total,,,,
V0 = -344 W0 = -203 MeV
K-pp N,,,,
(SGM)
K-pp total,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
V0 = -404 W0 = -213 MeV
-150 -100 -50 0 50E ( MeV )
K-pp N,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
-150 -100 -50 0 500
20
40
60
E ( MeV )
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(FINUDA)
K-pp N,,,,K-pp N
,, ,,K-pp YN,,,,
K-pp total,,,,
V0 = -292 W0 = -107 MeV(YA)B( N) = 0.7
B(YN) = 0.2
1B( N) = 0.11
2
K-pp N,,,,
K-pp N,,,,K-pp YN,,,,
K-pp total,,,,
V0 = -237 W0 = -128 MeVB( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
0
20
40
60
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(DHW)
3He (K-, n) X @ 1 GeV/c Excluding K- escape process
few mb/sr in bound region!cf. 10 μb/sr assumed in prop.
K-pp N,,,,
K-pp YN,,,,
K-pp total,,,,
V0 = -344 W0 = -203 MeV
K-pp N,,,,
(SGM)
K-pp total,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
V0 = -404 W0 = -213 MeV
-150 -100 -50 0 50E ( MeV )
K-pp N,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
-150 -100 -50 0 500
20
40
60
E ( MeV )
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(FINUDA)
K-pp N,,,,K-pp N
,, ,,K-pp YN,,,,
K-pp total,,,,
V0 = -292 W0 = -107 MeV(YA)B( N) = 0.7
B(YN) = 0.2
1B( N) = 0.11
2
K-pp N,,,,
K-pp N,,,,K-pp YN,,,,
K-pp total,,,,
V0 = -237 W0 = -128 MeVB( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
0
20
40
60
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(DHW)
limiting to nYN final states1mb/sr!~>
2011年1月15日土曜日
exclusive pp → K+Λp at Tp = 2.85 GeV
BK~100MeV and ΓK~100MeV
T. Yamazaki, M. Maggiora, P. Kienle, et al, PRL 104, 132502 (2010)
DISTO DATA
2011年1月15日土曜日
KH vs DISTO
K-pp N,,,,
K-pp YN,,,,
K-pp total,,,,
V0 = -344 W0 = -203 MeV
K-pp N,,,,
(SGM)
K-pp total,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
V0 = -404 W0 = -213 MeV
-150 -100 -50 0 50E ( MeV )
K-pp N,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
-150 -100 -50 0 500
20
40
60
E ( MeV )
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(FINUDA)
K-pp N,,,,
K-pp N,, ,,K-pp YN,,,,
K-pp total,,,,
V0 = -292 W0 = -107 MeV(YA)B( N) = 0.7
B(YN) = 0.2
1B( N) = 0.11
2
K-pp N,,,,
K-pp N,,,,K-pp YN,,,,
K-pp total,,,,
V0 = -237 W0 = -128 MeVB( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
0
20
40
60
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(DHW)
2011年1月15日土曜日
KH vs DISTO
K-pp N,,,,
K-pp YN,,,,
K-pp total,,,,
V0 = -344 W0 = -203 MeV
K-pp N,,,,
(SGM)
K-pp total,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
V0 = -404 W0 = -213 MeV
-150 -100 -50 0 50E ( MeV )
K-pp N,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
-150 -100 -50 0 500
20
40
60
E ( MeV )
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(FINUDA)
K-pp N,,,,
K-pp N,, ,,K-pp YN,,,,
K-pp total,,,,
V0 = -292 W0 = -107 MeV(YA)B( N) = 0.7
B(YN) = 0.2
1B( N) = 0.11
2
K-pp N,,,,
K-pp N,,,,K-pp YN,,,,
K-pp total,,,,
V0 = -237 W0 = -128 MeVB( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
0
20
40
60
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(DHW)
-150 -100 -50 0 50E ( MeV )
-150 -100 -50 0 500
20
40
60
E ( MeV )
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(FINUDA)
K-pp total,,,,
V0 = -292 W0 = -107 MeV(YA)B( N) = 0.7
B(YN) = 0.2
1B( N) = 0.11
2
,,
K-pp total,,,,
V0 = -237 W0 = -128 MeVB( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
0
20
40
60
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(DHW)
K-pp N,,,,DISTO K-pp N,,,,DISTO
K-pp N,,,,DISTOK-pp N,,,,DISTO
DISTO
2011年1月15日土曜日
KH vs DISTO
K-pp N,,,,
K-pp YN,,,,
K-pp total,,,,
V0 = -344 W0 = -203 MeV
K-pp N,,,,
(SGM)
K-pp total,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
V0 = -404 W0 = -213 MeV
-150 -100 -50 0 50E ( MeV )
K-pp N,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
-150 -100 -50 0 500
20
40
60
E ( MeV )
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(FINUDA)
K-pp N,,,,
K-pp N,, ,,K-pp YN,,,,
K-pp total,,,,
V0 = -292 W0 = -107 MeV(YA)B( N) = 0.7
B(YN) = 0.2
1B( N) = 0.11
2
K-pp N,,,,
K-pp N,,,,K-pp YN,,,,
K-pp total,,,,
V0 = -237 W0 = -128 MeVB( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
0
20
40
60
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(DHW)
-150 -100 -50 0 50E ( MeV )
-150 -100 -50 0 500
20
40
60
E ( MeV )
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(FINUDA)
K-pp total,,,,
V0 = -292 W0 = -107 MeV(YA)B( N) = 0.7
B(YN) = 0.2
1B( N) = 0.11
2
,,
K-pp total,,,,
V0 = -237 W0 = -128 MeVB( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
0
20
40
60
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(DHW)
K-pp N,,,,DISTO K-pp N,,,,DISTO
K-pp N,,,,DISTOK-pp N,,,,DISTO
DISTO
- does not fit in KH scheme
BK~100MeV and ΓK~100MeV
- only for Λp decay ch.private communication
2011年1月15日土曜日
KH vs DISTO
K-pp N,,,,
K-pp YN,,,,
K-pp total,,,,
V0 = -344 W0 = -203 MeV
K-pp N,,,,
(SGM)
K-pp total,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
V0 = -404 W0 = -213 MeV
-150 -100 -50 0 50E ( MeV )
K-pp N,,,,
B( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
-150 -100 -50 0 500
20
40
60
E ( MeV )
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(FINUDA)
K-pp N,,,,
K-pp N,, ,,K-pp YN,,,,
K-pp total,,,,
V0 = -292 W0 = -107 MeV(YA)B( N) = 0.7
B(YN) = 0.2
1B( N) = 0.11
2
K-pp N,,,,
K-pp N,,,,K-pp YN,,,,
K-pp total,,,,
V0 = -237 W0 = -128 MeVB( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
0
20
40
60
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(DHW)
-150 -100 -50 0 50E ( MeV )
-150 -100 -50 0 500
20
40
60
E ( MeV )
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(FINUDA)
K-pp total,,,,
V0 = -292 W0 = -107 MeV(YA)B( N) = 0.7
B(YN) = 0.2
1B( N) = 0.11
2
,,
K-pp total,,,,
V0 = -237 W0 = -128 MeVB( N) = 0.7 B(YN) = 0.2
1B( N) = 0.11
2
0
20
40
60
d2/d
ndE n
( µ
b/(s
r. MeV
) )
(DHW)
K-pp N,,,,DISTO K-pp N,,,,DISTO
K-pp N,,,,DISTOK-pp N,,,,DISTO
DISTO
- does not fit in KH scheme
BK~100MeV and ΓK~100MeV
- only for Λp decay ch.private communication
easy to observe,if dσ/dΩ 1mb/sr~>and Λp decay channel
( n + Λp final state )
2011年1月15日土曜日
Neutron missing mass spectra @ 30kW*week
simulated by T. Hiraiwa
2000 2200 2400 2600 2800 3000]2c,n) [MeV/-He(K3missing mass of
0
100
200
300
400
500
coun
ts
Expected yield for 30 kW. week
incident beampp -K p (100%)
conv.2NR + N FSI2NR +
relative yields of background
components are unknown
equal yields assumed
3He(K-,n) p : fully reconstructed
acceptance
600
2011年1月15日土曜日
Neutron missing mass spectra @ 30kW*week
simulated by T. Hiraiwa
Assume DISTO like data, BK~100MeV and ΓK~100MeV
dσ/dΩθ=0 = 1 mb/srBR(Λp) = 100 %
for simplicity
p3He
nK-
CDS
NC
"Kpp"
signal
2000 2200 2400 2600 2800 3000]2c,n) [MeV/-He(K3missing mass of
0
100
200
300
400
500
coun
ts
Expected yield for 30 kW. week
incident beampp -K p (100%)
conv.2NR + N FSI2NR +
relative yields of background
components are unknown
equal yields assumed
3He(K-,n) p : fully reconstructed
acceptance
600
2011年1月15日土曜日
Neutron missing mass spectra @ 30kW*week
simulated by T. Hiraiwa
Assume DISTO like data, BK~100MeV and ΓK~100MeV
dσ/dΩθ=0 = 1 mb/srBR(Λp) = 100 %
for simplicity
p3He
nK-
CDS
NC
"Kpp"
signal
2000 2200 2400 2600 2800 3000]2c,n) [MeV/-He(K3missing mass of
0
100
200
300
400
500
coun
ts
Expected yield for 30 kW. week
incident beampp -K p (100%)
conv.2NR + N FSI2NR +
relative yields of background
components are unknown
equal yields assumed
3He(K-,n) p : fully reconstructed
acceptance
600
2NR initiated reactions
p3He
n
K-CDS
NCσ ~ 10 mb each
backgrounds
2011年1月15日土曜日
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
In-flight Kinematics
p3HenK-
kinematical boundary
3-body Phase Space (Dalitz's plot) at CM
Λpn event distribution on Phase Space
simulated by T. Hiraiwa2011年1月15日土曜日
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
CDS Acceptance
p3HenK-
3-body Phase Space (Dalitz's plot) at CM
CDSp in CDS(p )
CDS Acceptance
simulated by T. Hiraiwa2011年1月15日土曜日
p in CDSn in NC
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
CDS & NC Acceptance
p3HenK-
3-body Phase Space (Dalitz's plot) at CM
CDS
NC
CDS & NC Acceptance
simulated by T. Hiraiwa2011年1月15日土曜日
on 3-body Phase Space (Dalitz's plot) at CM
p in CDSn in NC
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
(Tp - Tn ) / 3Q
T /
Q
CDS & NC Acceptance
Background? Two Nucleon Reaction and FSI (Σ-Λ conversion)
simulated by T. Hiraiwa2011年1月15日土曜日
p3He
nK-
or
p3He
n
K-
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
on 3-body Phase Space (Dalitz's plot) at CM2NR and conversion
Background? Two Nucleon Reaction and FSI (Σ-Λ conversion)
simulated by T. Hiraiwa
multi-step PWIA
2011年1月15日土曜日
p3He
nK-
or
p3He
n
K-
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
on 3-body Phase Space (Dalitz's plot) at CM2NR and conversion
Background? Two Nucleon Reaction and FSI (Σ-Λ conversion)
simulated by T. Hiraiwa
multi-step PWIA
1st step
2011年1月15日土曜日
p3He
nK-
or
p3He
n
K-
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
on 3-body Phase Space (Dalitz's plot) at CM2NR and conversion
Background? Two Nucleon Reaction and FSI (Σ-Λ conversion)
simulated by T. Hiraiwa
multi-step PWIA
1st step
2nd step
2011年1月15日土曜日
p3He
nK-
or
p3He
n
K-
n
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
on 3-body Phase Space (Dalitz's plot) at CM2NR and conversion
CDS
CDS
p3He
nK-
or
p3He
n
K-
n
p in CDS(p )
Background? Two Nucleon Reaction and FSI (Σ-Λ conversion)
simulated by T. Hiraiwa
multi-step PWIA
2011年1月15日土曜日
p3He
nK-
CDS
NC
p3He
n
K-CDS
NCor
p in CDSn in NC
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
on 3-body Phase Space (Dalitz's plot) at CM2NR and conversion
Background? Two Nucleon Reaction and FSI (Σ-Λ conversion)
simulated by T. Hiraiwa
multi-step PWIA
2011年1月15日土曜日
p3He
nK-
CDS
NCon 3-body Phase Space (Dalitz's plot) at CM2NR and conversion
0
0.2
0.4
0.6
0.8
1
p in CDSn in NC
-0.6 -0.4 -0.2 0 0.2 0.4 0.6
(Tp - Tn ) / 3Q
T /
Q
p3He
n
K-CDS
NCor
p3He
nK-
CDS
NC
"Kpp"
signal
Background? vs signal (ratio arbitrary)Two Nucleon Reaction and FSI (Σ-Λ conversion)
simulated by T. Hiraiwa
multi-step PWIA
2011年1月15日土曜日
Is two nucleon reaction possible?in in-flight kinematics @ 1GeV/c
De Broglie wave length @ 1 GeV/c ~ 1.2 fm<
Nucleon distance ~ 1.5 fm
Not very likely...
although 2NR process should be examined on
cf.
1) nucleon or hyperon scattering2) Σ→Λ conversion
Two successive reaction after KNN
Note: Simple KNN channel excluded: Because it is easy to discriminate
T. Kishimoto et al., Prog. Theor. Phys. 118 (2007) 181
2NR not
seen!
by reducing the trigger level.
2011年1月15日土曜日
π+p
π−
preliminary
~2800 Λ σmass =3.5MeV/c2
preliminary
Present?
missing: transportation ofSW Magnet and NC
2011年1月15日土曜日
E151st ~ 30kW*week (2% in terms of proton on target)
E15 staging strategy
E15 approved = 1500kW*week (@ Pt equiv.)apparatus preparation is ready
not easy to realize
1) to know the background processes 2) to evaluate the realistic beam time for E15full
3) present an information of the KN interaction 3He(K-, n) spectrum below KN threshold4) a hint of signal in Λ + p + n final states
--
E151st realize before long shutdown in 2012
2011年1月15日土曜日
E151st ~ 30kW*week (2% in terms of proton on target)
E15 staging strategy
divide into 3 periods
E15 approved = 1500kW*week (@ Pt equiv.)apparatus preparation is ready
not easy to realize
1) to know the background processes 2) to evaluate the realistic beam time for E15full
3) present an information of the KN interaction 3He(K-, n) spectrum below KN threshold4) a hint of signal in Λ + p + n final states
--
E151st realize before long shutdown in 2012
2011年1月15日土曜日
J-PARC E15 Collaborationhttp://ag.riken.jp/J-PARC/collaboration/
2011年1月15日土曜日
Thank you for attention!
2011年1月15日土曜日
spare
2011年1月15日土曜日
K1.8BR with Pt (@50% loss)
E17 ~ 10kW*week
E151st ~ 30kW*week (first stage)cf. 1500kW*week (E15 full @ Pt equiv.)
E31 ~ 180kW*week
KN by x-ray via K- 3He
KN by bound state via K- 3He
Λ(1405) via K- d
> 2kW?
> 10kW?> 100kW?
> 20~40kW?
required power
All K incident experiments: Present Duty Factor will be OK up to few 10th of kW
2011年1月15日土曜日
Signal can be easily discriminated from signal in both FSI cases !
1) nucleon or hyperon scattering2) Σ→Λ conversion
Two successive reaction after KNN
Note: Simple KNN channel excluded: Because it is easy to discriminate
2011年1月15日土曜日
p in CDSn in NC
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
CDS & NC Acceptance
p3HenK-
3-body Phase Space (Dalitz's plot) at CM
CDS
NC
Can we extend the detection capability?
simulated by T. Hiraiwa2011年1月15日土曜日
p in CDSn in NC
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
CDS & NC Acceptance with one proton missing
p3HenK-
3-body Phase Space (Dalitz's plot) at CM
CDS
NC
p missing from CDS
Can we extend the detection capability?
simulated by T. Hiraiwa2011年1月15日土曜日
p3HenK-
CDS
NC
p missing from CDS
p3He
nK-
CDS
NC
"Kpp"
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
"Kpp" 3-body Phase Space (Dalitz's plot) at CM
Can we extend the detection capability?
BK~100MeV, ΓK~100MeV(like DISTO data)
simulated by T. Hiraiwa2011年1月15日土曜日
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
"Kpp" with one proton missing3-body Phase Space (Dalitz's plot) at CM
p3HenK-
CDS
NC
p missing from CDS
p3He
nK-
CDS
NC
"Kpp"
p missing from CDS
Can we extend the detection capability?
BK~100MeV, ΓK~100MeV(like DISTO data)
simulated by T. Hiraiwa2011年1月15日土曜日
Λpn final state selection by CDS & NCWhat happens if we miss other particles?
Other processes can be clearly
separated!
simulated by T. Hiraiwa
other than Λpn
Missing Energy [MeV]0 200 400 600 8000
50
100
150
200
250
coun
ts (a
.u.)
relative yields of each components
are unknown
missingmissing
QF-
pn final state
0pn final state
+
2011年1月15日土曜日
•Efficiency (NC eff. Is not included.)-‐3body phase space 0.079 % (all detected)
“Kpp”(B=100MeV Γ=100MeV) 0.042 % (all detected)0.098 % (one proton missing)
0.12% (one proton missing)
Improvement by one proton missing
Λpn / Σ0pn still be separated
x 2 improvement
Are they perfect?
QF-Y production also separated
simulated by T. Hiraiwa
•Missing proton resoluOon: 28.4 ±0.3 MeV/c2
but partial overlap with pπ missing
=X = N
NX = NX = NX =
]2cpn) [MeV/-, -Missing Mass of 3He(K600 800 1000 1200 1400 1600 1800
coun
ts (a
.u.)
0
1000
2000
3000
4000
5000
6000relative yields of each
components are unknown
missingp
p missing
p missing p missing
2011年1月15日土曜日
2011年1月15日土曜日
on 3-body Phase Space (Dalitz's plot) at CM
p in CDSn in NC
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
(Tp - Tn ) / 3Q
T /
Q
CDS & NC Acceptance
Background? Two Nucleon Reaction and FSI (Σ-Λ conversion)
simulated by T. Hiraiwa2011年1月15日土曜日
p3He
nK-
CDS
NCon 3-body Phase Space (Dalitz's plot) at CM
p in CDSn in NC
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
2NR and conversion
s
or
p3He
n
K-CDS
NCs
s
s
Background? Two Nucleon Reaction and FSI (Σ-Λ conversion)
simulated by T. Hiraiwa
multi-step PWIA
2011年1月15日土曜日
p3He
nK-
CDS
NCon 3-body Phase Space (Dalitz's plot) at CM
p in CDSn in NC
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
2NR and conversion
s
or
p3He
n
K-CDS
NCs
s
s
Background? Two Nucleon Reaction and FSI (Σ-Λ conversion)
simulated by T. Hiraiwa
multi-step PWIA
1st step
2011年1月15日土曜日
p3He
nK-
CDS
NCon 3-body Phase Space (Dalitz's plot) at CM
p in CDSn in NC
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
2NR and conversion
s
or
p3He
n
K-CDS
NCs
s
s
Background? Two Nucleon Reaction and FSI (Σ-Λ conversion)
simulated by T. Hiraiwa
multi-step PWIA
1st step
2nd step
2011年1月15日土曜日
p3He
nK-
CDS
NCon 3-body Phase Space (Dalitz's plot) at CM
p in CDSn in NC
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
2NR and conversion
s
or
p3He
n
K-CDS
NCs
s
s
Background? Two Nucleon Reaction and FSI (Σ-Λ conversion)
simulated by T. Hiraiwa
multi-step PWIA
2011年1月15日土曜日
p3He
nK-
CDS
NCon 3-body Phase Space (Dalitz's plot) at CM
p in CDSn in NC
-0.6 -0.4 -0.2 0 0.2 0.4 0.60
0.2
0.4
0.6
0.8
1
T /
Q
(Tp - Tn ) / 3Q
2NR and conversion
s
or
p3He
n
K-CDS
NCs
s
s
Background? Two Nucleon Reaction and FSI (Σ-Λ conversion)
simulated by T. Hiraiwa
multi-step PWIA
2011年1月15日土曜日
p3He
nK-
CDS
NCon 3-body Phase Space (Dalitz's plot) at CM
p in CDSn in NC
-0.6 -0.4 -0.2 0 0.2 0.4 0.6
(Tp - Tn ) / 3Q
0
0.2
0.4
0.6
0.8
1
T /
Q
2NR and conversion
s
or
p3He
n
K-CDS
NCs
s
s
p3He
nK-
CDS
NC
"Kpp"
signal signal
Background? vs signal (ratio arbitrary)Two Nucleon Reaction and FSI (Σ-Λ conversion)
simulated by T. Hiraiwa
multi-step PWIA
2011年1月15日土曜日
• Yield = Nkaon x t x dσ/dΩ(θ=0) x r x R x A x e x ε
–Nkaon : kaon per spill → 300k/spill (30 kW operaOon)
–t : target → 0.08 [g/cm3] / 3 [g/mol] x 6.02 x 1023 [mol-‐1] x 9.3 [cm] ~ 1.4 x 1023 [cm-‐2] –dσ/dΩ (@ θ = 0) → 3 [mb/sr] –r : branching raOo (Λ → π-‐p) → 0.63–R : “Kpp” decay branch → Br(Λp) + Br(Σ0p) ~ 1–A : NC acceptance → 12 [msr] –e : NC efficiency → 0.3
–ε : overall efficiency (trigger, detector, ana., etc) → 0.7• 2.1 x 104 signals on missing mass spectrum (by 1 week run)
Estimated yield by one proton missing
PLB 652(2007)262-268PR C 80,055208(2009)
(Λp + Σ0p branch)
2011年1月15日土曜日