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HES-HKS & KaoS meeting

HES-HKS & KaoS meeting. Toshi Gogami 31/Jan/2012. Contents. K + cut efficiency. HKS detectors. 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 52 Cr). K + p, π +. Drift chambers -KDC1,KDC2-.

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HES-HKS & KaoS meeting

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

  2. Contents • K+ cut efficiency

  3. HKS detectors 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+ Drift chambers -KDC1,KDC2- • Cherenkov detectors -AC,WC- • Aerogel (n=1.05) • Water (n=1.33) TOF walls -2X,1Y,1X- (Plastic scintillators) σ ≈ 250 [μm] TOF σ ≈ 170 [ps] Strangeness 2010 at KEK

  4. K+ cut efficiency • K+ survival ratio after • 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 (accut,wccut) = (5,-0.1)pi suv. ratio: 0.0631439+-0.00148976K  suv. ratio: 0.876875+-0.00513167p  suv. ratio: 0.911427+-0.0023794(accut,wccut) = (10,-0.1)pi suv. ratio: 0.105762+-0.0019663K  suv. ratio: 0.931211+-0.00536427p  suv. ratio: 0.94023+-0.00243485(accut,wccut) = (15,-0.1)pi suv. ratio: 0.141455+-0.00231043K  suv. ratio: 0.956913+-0.00547386p  suv. ratio: 0.960014+-0.00247285 p K+ π+ Stricter cut of AC NPE p K+ π+

  6. K+ survival ratio after WC cut (CH2) looser cut of WC NPE (accut,wccut) = (2000,1.1)pi suv. ratio: 0.922368+-0.00752531K  suv. ratio: 0.987653+-0.00566791p  suv. ratio: 0.133889+-0.000701787(accut,wccut) = (2000,1)pi suv. ratio: 0.963952+-0.00777583K  suv. ratio: 0.989093+-0.0056741p  suv. ratio: 0.176933+-0.000821917(accut,wccut) = (2000,0.9)pi suv. ratio: 0.971601+-0.00782181K  suv. ratio: 0.999575+-0.00571909p  suv. ratio: 0.259314+-0.00102927 p K+ π+ Stricter cut of WC NPE K+ p π+

  7. K+ survival ratio after AC, WC cut (52Cr) K+ Increase… ! まぁまぁ K+ π+ p π+ (accut,wccut) = (7,-0.1) pi suv. ratio: 0.065416+-0.000449255 K suv. ratio: 0.586117+-0.00452555 p suv. ratio: 0.651355+-0.00184533 (accut,wccut) = (10,-0.1) pi suv. ratio: 0.0798301+-0.000499635 K suv. ratio: 0.633024+-0.00477219 p suv. ratio: 0.715314+-0.0019709 (accut,wccut) = (12,-0.1) pi suv. ratio: 0.106535+-0.00058428 K suv. ratio: 0.576053+-0.00447227 p suv. ratio: 0.750981+-0.00204033 (accut,wccut) = (2000,1.2) pi suv. ratio: 0.97553+-0.0026548 K suv. ratio: 1.04522+-0.00476197 p suv. ratio: 0.306715+-0.00108176 (accut,wccut) = (2000,1.1) pi suv. ratio: 0.980888+-0.00266569 K suv. ratio: 1.04946+-0.00477655 p suv. ratio: 0.342593+-0.00115887 (accut,wccut) = (2000,1) pi suv. ratio: 0.999912+-0.00270431 K suv. ratio: 1.04956+-0.00477692 p suv. ratio: 0.382421+-0.0012424

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

  9. 学会の移動+宿 伊丹空港 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 関西学院大学 梅田

  10. Summary & outlook • Summary • K+ cut efficiency • 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

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