pptx

HES-HKS & KaoS meeting
Toshi Gogami
9/Aug/2012
仙台七夕祭り(6Aug2012)
Contents
• Current Spectra
• Mixed event analysis
• FB20
CH2 target
• Λ
– Δm~-100keV, FWHM~1.9MeV
• Σ
– Δm~+100keV, FWHM~1.9MeV
Single Gaussian fit
H2O target
• Λ
– Δm~-250keV, FWHM~2.5MeV
• Σ
– Δm~-10keV, FWHM~1.8MeV
Single Gaussian fit
12C
low current
~550 MeV (FWHM)
-11.34 MeV
The number of events
(-13MeV ~ -10.5MeV)
154 ± 20
The number of events
(-10.5MeV ~ -9.0MeV)
60 ± 16
12C
high current
The number of events
(-13.5MeV ~ -10MeV)
288 ± 41
The number of events
(-10.0MeV ~ -8.3MeV)
123 ± 30
7Li
target (without raster
correction)
7Li
To vanish a correlation between
y@target and missing mass.
target (with raster correction)
The number of events
(-7MeV ~ -2MeV)
517 ± 75
4月頃のChunhuaのマトリクスで
7Li target
陽にraster correctionは
入っていない
??
The number of events
(-7MeV ~ -2MeV)
481 ± 67
Preliminary status – 9ΛLi
KEK-E336
9 Be
L
9Be
target with Chen’s matrices
(~April)
 Lower statistic than that of previous page.
It might be wrong in the replay-stage.
Will check….
10B
target
The number of events
(-10.0MeV ~ -7.0MeV)
151 ± 31
The number of events
(-7.0MeV ~ -4.5MeV)
108 ± 29
10B
target
The number of events
(-10.0MeV ~ -7.0MeV)
151 ± 31
The number of events
(-7.0MeV ~ -4.5MeV)
108 ± 29
52Cr
target
(Before xt function correction)
52Cr
target
(Before xt function correction)
The number of events
(-21.0MeV ~ -18.0MeV)
15 ± 34
The number of events
(-17.0MeV ~ -12.0MeV)
123 ± 43
P. Bydzovsky, M. Sotona, T. Motoba, K. Itonaga, K. Ogawa, and O. Hashimoto ,
Photo- and electro-production of medium mass Λ-hypernuclei ,2008
The number of events
(-10.0MeV ~ -2.0MeV)
254 ± 54
Mixed event analysis
Reduce statistical errors which comes from
the accidental background.
Mixed event analysis
CH2
1. K+ selection and
coin-time selection
Iteration (j++)
2. Mix
– n+j<ent=total entries
•
(e,ep)
(e,eK+)
(e,eπ+)
Kn and en+j
– n+j>ent=total entries
•
10B
Kn and en+j-ent
[ ns ]
Mixed event analysis
6 bunches
4x300 bunches
Mixed event analysis (12ΛB)
10B(e,e’K+)10
ΛBe
Preparation for FB20 in Fukuoka
• 日程
– 8/19仙台発
– 8/21 oral presentation (15min + 5min)
• Electroproduction of K+Λ at JLab Hall-C
– 8/25仙台着
• 飛行機
– 往路28,600 + 復路20,900 = \49,500-
• 今週流れをfixして  来週発表練習したいです。
To do
• FB20 in Fukuoka
– 8/19 – 8/25
• SNP12 in Osaka
– 8/26 – 8/29
• Tours in Black forest
– 8/31(9/1) – 9/8
• JPS in Kyoto
– 8/10 – 8/14
• HYP2012 + core2core in Barcelona
– 10上旬
• JLab
• Mainz beam time
• JLab

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