1. HES-HKS & KaoS meeting 21/Oct/2011 Toshi Gogami 11/Mar/2010, E05-115 End-Run Party at Kappo Nara, Newport News, US

2. Contents KDC x-t function correction (H 2 O) Momentum dependence of HKS tracking eff. About discarded events

3. x-t func. calibration (H 2 O, HKS side) DBASE/ – E05115.datbase, e05115.param.* E05115repaly/ PARAM/ – hdriftmap.param.*

4. x-t func. calibration (H 2 O, HKS side) Number of runs = 157 (H 2 O) – hdriftmap.param. 75511 (125 runs, 75523-75909) 75885 (3 runs, 75921-75923) 75928 (29 runs, 75921-7597) RUNParam 1Param 2 Need to check that these parameters are not used for other targets

5. Rates of the KDC wires 52 Cr, 77124 Wire Number Rate [kHz] KDC1-u KDC1-u’KDC1-xKDC1-x’KDC1-vKDC1-v’ KDC2-u KDC2-u’KDC2-xKDC2-x’KDC2-vKDC2-v’ < 510 kHz < 350 kHz < 290 kHz < 230 kHz 52 Cr, 76314 KDC1 KDC2 ~11 MHz ~22 MHz 77124 ( 52 Cr target ) 5 × 5

6. Momentum dependence of the HKS tracking efficiency HKS single analysis Kaon – hwatnkn1+hwatnkn2>1.0 – haernpe1+haernpe2+haernp e3<5.0 – 0.0<hmsq && hmsq<0.5 Pion and positron – hwatnkn1+hwatnkn2>1.0 – haernpe1+haernpe2+haernp e3>10.0 – -0.5<hmsq && hmsq<0.5 Proton – hwatnkn1+hwatnkn2 0.0 – haernpe1+haernpe2+haernp e3<5.0 – 0.6<hmsq && hmsq<1.2 Momentum distribution of HKS (HKS single) CH 2, 76314 (200,000 events)

7. Momentum dependence of the HKS tracking efficiency Tracking eff [%] 1.98.49 2.97.46 3.98.69 4.98.82 Region1Region2Region3Region4 CH 2, 76314 (200,000 events) Note : 52 Cr, 77124 No big difference in my code. Bug Tracking code itself (5/6 × 5/6)

8. HKS Event disp. Black : hit wires Blue : Selected wires Res : Tracks KDC1 (RUN 77124)

9. Data pickup for HKS event display Trans_scin Trans_dc Track Select_good_track Link_tracks H_physics Total hit in KDC Hit layer and wire Multiplicity for each layer Etc. Number of tracks x,xp,y,yp at reference plane Selected wires Layer residual, chi2 Momentum KTOF,AC,WC ntuple start data

10. Select data EMACS start ・・・・ data start ・・・ start ・・・・ data ・・・ Select start ・・・・ data start ・・・・ data start ・・・・ data ・・・・ For detail  http://lambda.phys.tohoku.ac.jp/~gogami/ppt/HLab-meeting(2011_1_25).pdf http://lambda.phys.tohoku.ac.jp/~gogami/ppt/HLab-meeting(2011_1_25).pdf

11. Select data EMACS start ・・・・ data start ・・・ start ・・・・ data ・・・ Select start ・・・・ data start ・・・・ data start ・・・・ data ・・・・ CH 2 (76314) Track : 26.8% 52 Cr(77124) Track : 3.6% ***_trash.dat Hit on the two chambers Required number of hit wires Tracking χ 2 ・・・

12. Events which are discarded CH 2, 76314 KDC1 KDC2

13. Events which are discarded 52 Cr, 77124 KDC1 KDC2

14. Events which are discarded 52 Cr, 77124 KDC1 KDC2 Where and why are these events discard ? Are these events threw away with correct cut condition? Where and why are these events discard ? Are these events threw away with correct cut condition?

15. Summary and To do Summary – KDC x-t function correction (H 2 O) Check parameter file which need to be corrected. – Momentum dependence of HKS tracking eff. Could see no difference between low and high mom. – Check bugs of my code – Is this just caused by tracking code itself (5/6 x 5/6) ? – About discarded events Need to be checked that – Where and why these events are threw away – Cut condition is correct To do – E01-011 Enge GEANT – E05-115 Momentum dependence of the HKS tracking efficiency HKS b.g. rate study by GEANT simulation Miss identification efficiency estimation by Doi code

16. END 12/Oct/2011, 駐車場より

17. x distribution of HKS RP HKS single analysis Kaon – hwatnkn1+hwatnkn2>1.0 – haernpe1+haernpe2+haernp e3<5.0 – 0.0<hmsq && hmsq<0.5 Pion and positron – hwatnkn1+hwatnkn2>1.0 – haernpe1+haernpe2+haernp e3>10.0 – -0.5<hmsq && hmsq<0.5 Proton – hwatnkn1+hwatnkn2 0.0 – haernpe1+haernpe2+haernp e3<5.0 – 0.6<hmsq && hmsq<1.2 x distribution of HKS Reference Plane (HKS single) CH 2, 76314 (200,000 events)

18. X distribution at HKS RP CH 2, 76314 (200,000 events)

19. Abs(WC – TC) |Wire center – Track coordinate| s 0 Wire center Track coordinate Black : |WC-TC| Magenta : Profile of |WC-TC| Green : x-t calc. Track Drift distance Fitting Function

20. x-t calibration for 52 Cr Target Residual better – KDC1 ; 400 [μm]  300 [μm] Number up – 10% increased at χ 2 <20

21. x-t calibration for H 2 O Target Residual better Number up – 10% increased at χ 2 <20

22. Tracking residuals of 12 C target High Current (Run:75967) Low Current (Run:76051) There are room to be improved maybe.