HES-HKS & KaoS meeting Toshi Gogami 31/Jan/2012.

Presentation on theme: "HES-HKS & KaoS meeting Toshi Gogami 31/Jan/2012."— Presentation transcript:

1 HES-HKS & KaoS meeting Toshi Gogami 31/Jan/2012

2 Contents K+ cut efficiency

3 HKS detectors − π+ K+ p K+ p, π+ 1 [m] HKS trigger CP = 1X ×1Y × 2X
June 2009 in JLab Hall-C 1 [m] HKS trigger CP = 1X ×1Y × 2X K = WC × AC  CP × K − π+ K+ p ~18 [kHz] (8 [μA] on 52Cr) K+ p, π+ Cherenkov detectors -AC,WC- Aerogel (n=1.05) Water (n=1.33) Drift chambers -KDC1,KDC2- TOF walls -2X,1Y,1X- (Plastic scintillators) σ ≈ 250 [μm] TOF σ ≈ 170 [ps] Strangeness 2010 at KEK

4 K+ cut efficiency π+ p K+ π+ p K+ K+ survival ratio after AC npe sum
WC NPE cut AC NPE cut Mass square cut Coincidence time cut π+ AC npe sum p K+ π+ WC npe sum p K+ Mass square

5 K+ survival ratio after AC cut (CH2)
looser cut of AC NPE p K+ π+ Stricter cut of AC NPE p (accut,wccut) = (5,-0.1) pi suv. ratio: K  suv. ratio: p  suv. ratio: (accut,wccut) = (10,-0.1) pi suv. ratio: K  suv. ratio: p  suv. ratio: (accut,wccut) = (15,-0.1) pi suv. ratio: K  suv. ratio: p  suv. ratio: K+ π+

6 K+ survival ratio after WC cut (CH2)
looser cut of WC NPE p K+ π+ Stricter cut of WC NPE (accut,wccut) = (2000,1.1) pi suv. ratio: K  suv. ratio: p  suv. ratio: (accut,wccut) = (2000,1) pi suv. ratio: K  suv. ratio: p  suv. ratio: (accut,wccut) = (2000,0.9) pi suv. ratio: K  suv. ratio: p  suv. ratio: K+ p π+

7 K+ survival ratio after AC, WC cut (52Cr)
まぁまぁ K+ Increase… ! K+ π+ p π+ (accut,wccut) = (7,-0.1) pi suv. ratio: K suv. ratio: p suv. ratio: (accut,wccut) = (10,-0.1) pi suv. ratio: K suv. ratio: p suv. ratio: (accut,wccut) = (12,-0.1) pi suv. ratio: K suv. ratio: p suv. ratio: (accut,wccut) = (2000,1.2) pi suv. ratio: K suv. ratio: p suv. ratio: (accut,wccut) = (2000,1.1) pi suv. ratio: K suv. ratio: p suv. ratio: (accut,wccut) = (2000,1) pi suv. ratio: K suv. ratio: p suv. ratio:

8 Need to improve the fitting
WC NPE1+2 > 0.1 Stricter cut WC NPE1+2 > 0.4 WC NPE1+2 > 0.6 K+ increase Fitting is not going well…. Pre π+ cut Cut low and high mom segments separately

9 学会の移動+宿 伊丹空港 関西学院大学 梅田 飛行機往復 + ホテル4泊(ホテルコムズ大阪、朝食付き) = 50,800円

10 Summary & outlook Summary Outlook K+ cut efficiency E01-011 E05-115
Need to fit mass square distribution for high multiplicity data. Outlook E01-011 ENGE + SPL GEANT4 TOSCA　来週千賀さんと E05-115 Trigger efficiency (Chiba study) Tracking efficiency K + Cut efficiency for high multiplicity data Matrix SNP2012 2/12- 2/18 J-PARC, Tohoku Univ. , Sakunami GCOE 国際シンポジウム 2/20 – 2/22 Tohoku Univ. JLab 出張 3/6 – 3/21 物理学会 (関西学院大学) 3/23 – 3/27 (前日入り)

11 END 26/Jan/2012, 愛宕神社