HES-HKS & KaoS meeting

21/Oct/2011Toshi Gogami

11/Mar/2010, E05-115 End-Run Partyat Kappo Nara, Newport News, US

Contents

• KDC x-t function correction (H2O) • Momentum dependence of HKS tracking eff.• About discarded events

x-t func. calibration (H2O, HKS side)

• DBASE/– E05115.datbase, e05115.param.*

E05115repaly/• PARAM/

– hdriftmap.param.*

x-t func. calibration (H2O, HKS side)

• Number of runs = 157 (H2O)– hdriftmap.param.• 75511 (125 runs, 75523-75909)• 75885 (3 runs, 75921-75923)• 75928 (29 runs, 75921-7597)

RUN Param 1 Param 2

Need to check that these parameters are not used for other targets

Rates of the KDC wires52Cr, 77124

Wire Number

Rate

[kHz

]KDC1-u KDC1-u’ KDC1-x KDC1-x’ KDC1-v KDC1-v’

KDC2-u KDC2-u’ KDC2-x KDC2-x’ KDC2-v KDC2-v’

< 510 kHz < 350 kHz

< 290 kHz < 230 kHz

52Cr, 76314

KDC1 KDC2~11 MHz~22 MHz

77124 ( 52Cr target )

5 × 5

Momentum dependence of the HKS tracking efficiency

HKS single analysis• Kaon

– hwatnkn1+hwatnkn2>1.0– haernpe1+haernpe2+haernpe3<5.

0– 0.0<hmsq && hmsq<0.5

• Pion and positron– hwatnkn1+hwatnkn2>1.0– haernpe1+haernpe2+haernpe3>1

0.0– -0.5<hmsq && hmsq<0.5

• Proton – hwatnkn1+hwatnkn2<1.0 &

hwatnkn1+hwatnkn2>0.0– haernpe1+haernpe2+haernpe3<5.

0– 0.6<hmsq && hmsq<1.2

Momentum distribution of HKS (HKS single)

CH2, 76314 (200,000 events)

Momentum dependence of the HKS tracking efficiency

• Trackingeff [%]

1. 98.492. 97.463. 98.694. 98.82

Region1 Region2 Region3 Region4

CH2, 76314 (200,000 events)

Note : 52Cr, 77124

No big difference in my code.• Bug• Tracking code itself

(5/6 × 5/6)

HKS Event disp.Black : hit wiresBlue : Selected wiresRes : Tracks

KDC1(RUN 77124)

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

Select data

EMACS

start・・・・・・・・datastart・・・・・・start・・・・・・・・data・・・

Select

start・・・・・・・・datastart・・・・・・・・datastart・・・・・・・・data・・・・

For detail http://lambda.phys.tohoku.ac.jp/~gogami/ppt/HLab-meeting(2011_1_25).pdf

Select data

EMACS

start・・・・・・・・datastart・・・・・・start・・・・・・・・data・・・

Select

start・・・・・・・・datastart・・・・・・・・datastart・・・・・・・・data・・・・

• CH2(76314)• Track : 26.8%

• 52Cr(77124)• Track : 3.6%

***_trash.dat

• Hit on the two chambers• Required number of hit wires• Tracking χ2

• ・・・

Events which are discarded

CH2, 76314

KDC1

KDC2

Events which are discarded

52Cr, 77124

KDC1

KDC2

Events which are discarded

52Cr, 77124

KDC1

KDC2

• Where and why are these events discard ?• Are these events threw away with correct cut condition?

Summary and To do• Summary

– KDC x-t function correction (H2O)• 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

END

12/Oct/2011, 駐車場より

x distribution of HKS RP

HKS single analysis• Kaon

– hwatnkn1+hwatnkn2>1.0– haernpe1+haernpe2+haernpe3<5.

0– 0.0<hmsq && hmsq<0.5

• Pion and positron– hwatnkn1+hwatnkn2>1.0– haernpe1+haernpe2+haernpe3>1

0.0– -0.5<hmsq && hmsq<0.5

• Proton – hwatnkn1+hwatnkn2<1.0 &

hwatnkn1+hwatnkn2>0.0– haernpe1+haernpe2+haernpe3<5.

0– 0.6<hmsq && hmsq<1.2

x distribution of HKS Reference Plane (HKS single)

CH2, 76314 (200,000 events)

X distribution at HKS RP

CH2, 76314 (200,000 events)

Abs(WC – TC)

|Wire center – Track coordinate|

s0

Wire center

Track coordinate

Black : |WC-TC|Magenta : Profile of |WC-TC|Green : x-t calc.

Track

Drift distance

Fitting Function

x-t calibration for 52Cr Target

• Residual better– KDC1 ; 400 [μm] 300 [μm]

• Number up– 10% increased at χ2 <20

x-t calibration for H2O Target

• Residual better

• Number up– 10% increased at χ2 <20

Tracking residuals of 12C targetHigh Current (Run:75967)

Low Current (Run:76051)

There are room to be improved maybe.