Lambda hypernuclear spectroscopy up to medium heavy mass number at JLab Hall-C Graduate school of...
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- Slide 1
- Lambda hypernuclear spectroscopy up to medium heavy mass number
at JLab Hall-C Graduate school of Science, Tohoku Univ. Toshiyuki
Gogami
- Slide 2
- Contents Introduction Experimental setup Analyses Missing mass
Summary
- Slide 3
- Contents Introduction Experimental setup Analyses Missing mass
Summary ee u u d u s s u d p K+K+ ** (e,eK + ) reaction
- Slide 4
- hypernuclear spectroscopy Updated from: O. Hashimoto and H.
Tamura, Prog. Part. Nucl. Phys. 57 (2006) 564. 52 V
- Slide 5
- Spectroscopic experiment by the (e,eK + ) reaction p n ** K+K+
e-e- e + p e + K + + target nucleus ~ 1990s The (K -, - ), ( +,K +
) reactions Energy resolution ~ a few MeV n e-Spectrometer K +
-Spectrometer p e p K+ Missing Mass M HY 2000~ The (e,eK + )
reaction Energy resolution ~0.5 MeV p
- Slide 6
- Experimental motivation JLab E05-115 (2009, Hall-C) Elementary
processes (, 0 ) 7 He [1], 9 Li, 10 Be N charge symmetry breaking
N-N coupling 12 B [2][3][4] Consistency check with the past
experiments Check analysis progress 52 V Single particle energy For
measurements with heavier targets [1] S.N.Nakamura et al., PRL 110,
012502 (2013) [2] T.Miyoshi et al., PRL 90, 232502 (2003) [3]
L.Yuan, PRC 73, 044607 (2006) [4] M.Iodice, PRL 99, 052501
(2007)
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- Contents Introduction Experimental setup Analyses Missing mass
Summary HES
- Slide 8
- Experimental setup (E05-115 @ JLab Hall-C)
- Slide 9
- Contents Introduction Experimental setup Analyses Missing mass
Summary
- Slide 10
- Analysis
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- x, x, y, y p, x, y @ Reference plane @ Target Missing Mass
- Slide 12
- Energy scale calibration e, K + Polyethylene target (0.45 g/cm
2 ) FWHM ~ 1.8 MeV
- Slide 13
- Contents Introduction Experimental setup Analyses Missing mass
Summary
- Slide 14
- 10 Be, 12 B histograms N s ~190 ss pp FWHM~0.9 MeV N s ~530 ss
Preliminary T.Motoba et al., PTP Supplement 185 ( 2010 ) Analyses
are in progress to achieve better energy resolution with keeping
good linearity. Analyses are in progress to achieve better energy
resolution with keeping good linearity.
- Slide 15
- Summary and outlook JLab E05-115 (2009) , 0, 7 He, 9 Li, 10 Be,
12 B, 52 V Analyses are in progress Matrix tuning Blind analysis
Efficiencies
- Slide 16
- E05-115 collaboration
- Slide 17
- Backup
- Slide 18
- New challenging experiment , 0 Elementary process Energy scale
calibration 12 B Consistency check 27 Mg, 48 Sc Deformation 208 Tl
Single particle energy 1m p n ** K+K+ e-e- target nucleus
- Slide 19
- New challenging experiment , 0 Elementary process Energy scale
calibration 12 B Consistency check 27 Mg, 48 Sc Deformation 208 Tl
Single particle energy 4 H Charge symmetry breaking 1m p n --
target nucleus
- Slide 20
- New challenging experiment , 0 Elementary process Energy scale
calibration 12 B Consistency check 27 Mg, 48 Sc Deformation 208 Tl
Single particle energy Design and setup 3-D magnetic field
calculation Monte Carlo simulation Experimental operation Analyses
Energy scale calibration Tracking 1m 4 H Charge symmetry
breaking
- Slide 21
- Background events in the HKS z [cm] y [cm] x [cm] KDC1 KDC2
KDC1 KDC2 9 Be, 38.4 [A] REAL DATA SIMULATION e+e+ 52 Cr target
Luminosity ( 1/10 ) Worse S/N Tracking is not easy
- Slide 22
- Tracking efficiency and residual ~ 160 m Plane efficiency
Tracking residual ~ 350 m
- Slide 23
- 52 Cr(e,eK + ) 52 V Preliminary N bind ~870
- Slide 24
- Hit wire selection REAL DATA Black : hit wires Blue : selected
wires Red : track 52 Cr Target REAL DATA CH 2 Target Compared to
the conventional code Number of K + +130% Analysis time 30%
CUT
- Slide 25
- JLab E05-115, Carbon (112mg/cm 2 )
- Slide 26
- Energy scale calibration e, K + conversion Mx M < 100
keV/c2
- Slide 27
- REAL DATA Black : hit wires Blue : selected wires Red : track
CH 2 Target H 2 O Target
- Slide 28
- 52LV
- Slide 29
- Singles rate summary Up to ~30 [MHz] Up to ~15 [MHz] HES HKS
HKS trigger ~ 10[kHz] HES trigger ~ a few[MHz] HKS-HES
Collaboration Meeting, T.Gogami29
- Slide 30
- B.G. mix rate (real data) a b * hks ntulpe HKS-HES
Collaboration Meeting, T.Gogami30
- Slide 31
- e + simulation SIMULATION To see 1.Number of event 2.Angle
& momentum of e + generated in target To see 1.Number of event
2.Angle & momentum of e + generated in target HKS-HES
Collaboration Meeting, T.Gogami31
- Slide 32
- Spectroscopic experiment by the (e,eK + ) reaction p n ** K+K+
e-e- e + p e + K + + ee target nucleus Feynman diagram u u d u s s
u d p K+K+ ** ~ 1990s The (K -, - ), ( +,K + ) reactions Energy
resolution ~ a few MeV n e-Spectrometer K + -Spectrometer p e p K+
Missing Mass H HY 32 2000~ The (e,eK + ) reaction Energy resolution
~0.5 MeV p 2012/9/14JPS meeting in Kyoto, Toshi Gogami
- Slide 33
- Background events in the HKS z [cm] y [cm] x [cm] KDC1 KDC2
KDC1 KDC2 9 Be, 38.4 [A] REAL DATA SIMULATION ~2.24 ~4.94 e+e+ 52
Cr target Luminosity ( 1/10 ) Worse S/N Tracking is not easy
- Slide 34
- 10 Be, 12 B histograms N s ~190 ss pp FWHM~0.9 MeV N s ~530 ss
Preliminary
- Slide 35
- Experimental motivation JLab E05-115 (2009, Hall-C) Elementary
processes (, 0 ) 7 He [1], 9 Li, 10 Be N charge symmetry breaking
N-N coupling 12 B Consistency check with the past experiments Check
analysis progress 52 V Single particle energy (systematic study) ls
splitting, core-configuration mixing [1] S.N.Nakamura et al., PRL
110, 012502 (2013)
- Slide 36
- Detectors & Trigger K + p, + e-e- Drift chambers TOF walls
(Plastic scintillators) Cherenkov detectors Aerogel (n=1.05) Water
(n=1.33) HES HKS HKS trigger (TOF1x2x3) x Chrenkov ~10 kHz HKS
trigger (TOF1x2x3) x Chrenkov ~10 kHz HES trigger (TOF1x2) ~2000
kHz HES trigger (TOF1x2) ~2000 kHz Coincidence trigger HES x HKS
< 2 kHz Coincidence trigger HES x HKS < 2 kHz
2012/10/6Core2Core in Barcelona, Toshi Gogami36
- Slide 37
- 52 Cr(e,eK + ) 52 V Mixed event analysis s p d f
Preliminary
- Slide 38
- Electro-production of K + JLab E05-115 experiment by the (e,eK
+ ) reaction Small Q 2 ( ~0.01 [GeV/c] 2 ) almost real photon Real
photon 2013/3/27JPS meeting in Hiroshima, Toshi Gogami38
- Slide 39
- An importance of measurement of K + production at forward
angles At forward angles Data show lack of consistency We can
access K cm ~ 15 deg P.Bydzovsky and T.Mart, Phys. Rev. C 76,
065202 (2007) 2013/3/27JPS meeting in Hiroshima, Toshi Gogami39
Real photon Q 2 = 0 [ GeV/c ] 2
- Slide 40
- , 0 from polyethylene ( CH 2 )target JPS meeting in Hiroshima,
Toshi Gogami 2013/3/27 Preliminary 40
- Slide 41
- , 0 from CH 2 target JPS meeting in Hiroshima, Toshi Gogami
2013/3/27 Preliminary 41 p(e,eK + ) ~1.8MeV (FWHM) m = 19 17 keV/c
2 p(e,eK + ) 0 ~1.8MeV (FWHM) m = 73 47 keV/c 2 JLab E05-115 CH 2,
~ 450 [mg/cm 2 ] ~ 2.0 [A] ~ 38 [hours]
- Slide 42
- Cross sections 2013/3/27JPS meeting in Hiroshima, Toshi
Gogami42 SAPHIR : K.H. Glander et al., Eur. Phys. J. A 19, 251-273
(2004) CLAS : R. Bradford et al., Phys. Rev. C 73, 035202 (2006)
(*) + p K + + (*) + p K + + 0 Preliminary 200 16 91 Preliminary 85
13 34
- Slide 43
- Cross sections 2013/3/27JPS meeting in Hiroshima, Toshi
Gogami43 SAPHIR : K.H. Glander et al., Eur. Phys. J. A 19, 251-273
(2004) CLAS : R. Bradford et al., Phys. Rev. C 73, 035202 (2006)
JLab E94-107 : P. Markoviz et al., Proceedings of SENDAI08 (2009)
JLab E91-016 : F. Dohrmann et al., arXiv 0707.3059v2 (2007) (*) + p
K + + (*) + p K + + 0 Preliminary 200 16 91 Preliminary 85 13
34
- Slide 44
- Q 2 dependence (JLab E05-115) JLab E05-115, CH 2 target
Preliminary 2013/3/27JPS meeting in Hiroshima, Toshi Gogami44 W =
1.93 GeV CM = 17 degrees W = 1.93 GeV CM = 17 degrees (SAPHIR)
- Slide 45
- Apply to u,v-layer Applied to uu and vv layers, too. Selective
region determined by 1X and 2X Convert v v-layer x x-layer JPS
meeting in Kyoto, Toshi Gogami452012/9/14
- Slide 46
- Hit wires event display (2) GREEN region Selective region RED
markers & lines Selected hit wires BLACK markers & lines
Rejected hit wires v v u uu u x x v v u uu u x x KDC1 KDC2 particle
JPS meeting in Kyoto, Toshi Gogami462012/9/14
- Slide 47
- Detectors & Trigger K + p, + e-e- Drift chambers TOF walls
(Plastic scintillators) Cherenkov detectors Aerogel (n=1.05) Water
(n=1.33) HES HKS 2012/10/6Core2Core in Barcelona, Toshi
Gogami47
- Slide 48
- Detectors & Trigger K + p, + e-e- Drift chambers TOF walls
(Plastic scintillators) Cherenkov detectors Aerogel (n=1.05) Water
(n=1.33) HES HKS HKS trigger (TOF1x2x3) x Chrenkov ~10 kHz HKS
trigger (TOF1x2x3) x Chrenkov ~10 kHz HES trigger (TOF1x2) ~2000
kHz HES trigger (TOF1x2) ~2000 kHz Coincidence trigger HES x HKS
< 2 kHz Coincidence trigger HES x HKS < 2 kHz
2012/10/6Core2Core in Barcelona, Toshi Gogami48
- Slide 49
- Coincident K + Identification (OFF-LINE) 2012/10/6Core2Core in
Barcelona, Toshi Gogami49 Cherenkov selection Coincidence time
selection Aerogel (n=1.05) Water (n=1.33) K+K+ ++ p CUT p cut + cut
= HKS T - HES T ( e,ep ) ( e,e + ) CUT ( e,eK + ) Coincidence of
(e,eK + ) selection CUT m K 2 selection Coincident K + : ~90% ( + :
< 1%, p : < 2% )
- Slide 50
- 10 Be, 12 B histograms N s ~190 ss pp FWHM~0.9 MeV N s ~530 ss
Preliminary