JLab hypernuclear collaboration meeting/ JSPS Core to Core Seminar

Analysis Status of Heavy targets data of HES-HKS

9May2012 – 11May2012Department of Physics, Graduate School of Science, Tohoku Univ.

Toshiyuki Gogami

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 1

Contents1. Data summary & rate conditions

2. Improvement we did for high multiplicity data

3. What need to be done– Tracking code of HES– Optimization of cut conditions in the tracking stage– Parameter tune ( x-t function of drift chambers )

4. Summary

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 2

Contents1. Data summary & rate conditions

2. Improvement we did for high multiplicity data

3. What need to be done– Tracking code of HES– Optimization of cut conditions in the tracking stage– Parameter tune ( x-t function of drift chambers )

4. Summary

H2O52CrCH212C

Targets after the experiment

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 3

Data Summary

JLab E05-115 (2009/June – 2009/Nov)

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 4

e , e+ background in GEANT simulation

Vacuum chamber(sus304)

NMR port(sus304)

KDC1 KDC2

e- , e+

• Generated particle : e+

• Distribution : spherical uniform• Momentum : 860 – 1000 [MeV/c]• Angle : 0 – 2 [mrad]• 1000 events

e+

HKS

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 5

Rates of the HKS TOF detectors

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 6

Multiplicity of typical layer of chamber

HES HKS~1.13

~1.28

~2.24

~4.94

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 7

Contents1. Data summary & rate conditions

2. Improvement we did for high multiplicity data

3. What need to be done– Tracking code of HES– Optimization of cut conditions in the tracking stage– Parameter tune ( x-t function of drift chambers )

4. Summary

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 8

Discrepancy of Number of Λ (Before new tracking code adoption)

Lost events that we are interested in in tracking procedure.HES/HKS collaboration meeting, T.Gogami

Black : hit wires Blue : selected wiresRed : track

Black : hit wires Blue : selected wiresRed : track

REAL DATA REAL DATA

Λ Λ

Σ0Σ0

CH2 Target H2O Target

The number of ΛNΛ ¼ Nexpect

12C quasi-free

Acc. b.g.

16O quasi-freeAcc. b.g.

The number of ΛNΛ Nexpect

Very preliminary

Very preliminary

9-11/May/2012 9

HES/HKS collaboration meeting, T.Gogami

Results of Introduction of new Tracking Code

Increased !

Increased !

CH2

52Cr

•NΛ ¼ Nexpect

NΛ ½ Nexpect

H2O9-11/May/2012 10

Contents1. Data summary & rate conditions

2. Improvement we did for high multiplicity data

3. What need to be done– Tracking code of HES– Optimization of cut conditions in the tracking stage– Parameter tune ( x-t function of drift chambers )

4. Summary

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 11

Event display of HES detectors

Drift Chamber plane efficiency

• Other requirements– HKS

• 1X&1Y&2X

– HES• EH1&EH2

No No

YES YES YESYESYES

𝑃𝑙𝑎𝑛𝑒𝑒𝑓𝑓 . (𝑖)=h𝑇 𝑒𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝒀𝑬𝑺 (𝒊)h𝑇 𝑒𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑡𝑟𝑎𝑐𝑘𝑠

Extracted Track

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 12

Tracking efficiency

• HKS (KDC1 & KDC2)– 5/6 & 5/6

• HES (EDC1)– 8/10

• ・・・・・・• ・・・・・・• ・・・・・・

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 13

Analyzed runs

*ch276323763247632576326763277637676377763787637976380

*h2o75902759037590475908759097597175972759737597475975

*li76197761987619976200762017627176272762737627476275

*be76589765907659176592765947662976630766317663276633

*b76124761257612676127761287628576286762877628876289

*c75951759527595375954759677683976840768417684276843

*cr1 75997759987599976000760017601676017760187601976020

*cr2 77098770997710077101771027712077121771227712377124

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 14

Tracking efficiency

1 ….!?Need to check the tracking code

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 15

• ~~~~ HKS (5/6 & 5/6)~~~~~~~ch2 : Tracking Efficiency : 0.998974 +- 0.00760814 (0.761596%)h2o : Tracking Efficiency : 0.961109 +- 0.00190445 (0.198152%)li : Tracking Efficiency : 0.996378 +- 0.0205954 (2.06703%)be : Tracking Efficiency : 0.995274 +- 0.00535923 (0.538468%)b : Tracking Efficiency : 0.99921 +- 0.00912634 (0.913356%)c : Tracking Efficiency : 0.987929 +- 0.00179032 (0.181219%)cr1 : Tracking Efficiency : 0.974892 +- 0.00304261 (0.312097%)cr2 : Tracking Efficiency : 0.965851 +- 0.00320905 (0.332251% )

• ~~~~ HES (8/10) ~~~~~~~ch2 : Tracking Efficiency : 1 +- 0.00527844 (0.527844%)h2o : Tracking Efficiency : 1 +- 0.00095474 (0.095474%)li : Tracking Efficiency : 1 +- 0.0172701 (1.72701%)be : Tracking Efficiency : 1 +- 0.00419163 (0.419163%)b : Tracking Efficiency : 1 +- 0.00820523 (0.820523%)c : Tracking Efficiency : 1 +- 0.00153384 (0.153384%)cr1 : Tracking Efficiency : 1 +- 0.00100727 (0.100727%)cr2 : Tracking Efficiency : 1 +- 0.00103985 (0.103985%)

If there is a bias to use 10/10, 9/10 and 8/10 are possible to be thrown.

Contents1. Data summary & rate conditions

2. Improvement we did for high multiplicity data

3. What need to be done– Tracking code of HES– Optimization of cut conditions in the tracking stage– Parameter tune ( x-t function of drift chambers )

4. Summary

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 16

Events which are discarded

52Cr, 77124

KDC1

KDC2

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 17

Events which are discarded

52Cr, 77124

KDC1

KDC2

• Where and why are these events discarded ?• Are these events threw away by correct cut condition?

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 18

Events which are discarded

52Cr, 77124

KDC1

KDC2

• Where and why are these events discarded ?• Are these events threw away by correct cut condition?

h_pattern_recognition.f

~10% up

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 19

Contents1. Data summary & rate conditions

2. Improvement we did for high multiplicity data

3. What need to be done– Tracking code of HES– Optimization of cut conditions in the tracking stage– Parameter tune ( x-t function of drift chambers )

4. Summary

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 20

x-t function calibration

|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

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 21

x-t calibration for 52Cr Target

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

• Number up– ~10% increased at χ2 <20– (~5% increased without χ2 cut)

χ2 cut condition

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 22

Contents1. Data summary & rate conditions

2. Improvement we did for high multiplicity data

3. What need to be done– Tracking code of HES– Optimization of cut conditions in the tracking stage– Parameter tune ( x-t function of drift chambers )

4. Summary

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 23

Summary & What we need to do

• Parameter tune– x-t function calibration– TOF counters calibration

• Cut condition optimization– Optimization of the cuts in the tracking code

• Tracking code of HES– Too good tracking efficiency

• Prefer 10/10 events ?

• Estimate hidden efficiencies– Miss identification rate in the tracking stage

• By using GEANT simulation

– Trigger efficiency (TOF, AC over kill, TUL.....)HES/HKS collaboration meeting, T.Gogami9-11/May/2012 24

ENDJLab E05-115 collaboration, 2009, JLab Hall-C

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 25

Rates of the KDC LayersCH2, 76314

KDC1 KDC2~3 MHz~6 MHz

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 26

Rates of the KDC LayersH2O, 75971

KDC1 KDC2~10 MHz~20 MHz

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 27

Rates of the KDC Layers52Cr, 76314

KDC1 KDC2~11 MHz~22 MHz

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 28

Rates of the KDC wiresCH2, 76314

Wire Number

Rate

[kH

z]

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

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

< 150 kHz < 120 kHz

< 70 kHz < 60 kHz

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 29

Rates of the KDC wiresH2O, 75971

Wire Number

Rate

[kH

z]

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

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

< 450 kHz < 270 kHz

< 250 kHz < 200 kHz

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 30

Rates of the KDC wires52Cr, 77124

Wire Number

Rate

[kH

z]

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

HES/HKS collaboration meeting, T.Gogami9-11/May/2012 31

x-t calibration for H2O Target

• Residual better

• Number up– 10% increased at χ2 <20 HES/HKS collaboration meeting, T.Gogami9-11/May/2012 32

Singles rate summaryUp to ~30 [MHz]

Up to ~15 [MHz]HES

HKS

HKS trigger ~ 10[kHz]

HES trigger ~ a few[MHz]

COIN 2.0 [kHz]

HKS-HES Collaboration Meeting, T.Gogami 33

B.G. mix rate (real data)

ab

B.G mix rate =

* hks ntulpeHKS-HES Collaboration Meeting, T.Gogami 34

e+ simulation

SIMULATION

• To see 1. Number of event2. Angle & momentum

of e+ generated in target

HKS-HES Collaboration Meeting, T.Gogami 35

Target thickness dependence(Simulation)

H2O52Cr9Be

12C CH2

10B

7Li

Consistent with B.G. mix rate !

SIMULATION

HKS-HES Collaboration Meeting, T.Gogami 36

Tracking in HKS (pattern recognition)

• Make combination of hit wire belong to one space point for tracking

• pre tracking

1. Test point2. Space point

x

y

x

y

HKS-HES Collaboration Meeting, T.Gogami 37