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