JLab hypernuclear collaboration meeting / JSPS Core to Core Seminar Analysis Status of Heavy targets data of HES-HKS 9May2012 – 11May2012 Department of Physics, Graduate School of Science, Tohoku Univ. Toshiyuki Gogami HES/HKS collaboration meeting, T.Gogami9-11/May/20121

Contents 1.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/20122

Contents 1.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 H2OH2O 52 Cr CH 2 12 C Targets after the experiment HES/HKS collaboration meeting, T.Gogami9-11/May/20123

Data Summary JLab E (2009/June – 2009/Nov) HES/HKS collaboration meeting, T.Gogami9-11/May/20124

e, e + background in GEANT simulation Vacuum chamber (sus304) NMR port (sus304) KDC1KDC2 e -, e + Generated particle : e + Distribution : spherical uniform Momentum : 860 – 1000 [MeV/c] Angle : 0 – 2 [mrad] 1000 events e+e+ HKS HES/HKS collaboration meeting, T.Gogami9-11/May/20125

Rates of the HKS TOF detectors HES/HKS collaboration meeting, T.Gogami9-11/May/20126

Multiplicity of typical layer of chamber HES HKS ~1.13 ~1.28 ~2.24 ~4.94 HES/HKS collaboration meeting, T.Gogami9-11/May/20127

Contents 1.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/20128

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 wires Red : track Black : hit wires Blue : selected wires Red : track REAL DATA ΛΛ Σ0Σ0 Σ0Σ0 CH 2 Target H 2 O Target 12 C quasi-free Acc. b.g. 16 O quasi-free Acc. b.g. Very preliminary 9-11/May/20129

HES/HKS collaboration meeting, T.Gogami Results of Introduction of new Tracking Code Increased ! CH 2 52 Cr H2OH2O 9-11/May/201210

Contents 1.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/ Event display of HES detectors

Drift Chamber plane efficiency Other requirements – HKS 1X & 1Y & 2X – HES EH1 & EH2 No YES Extracted Track HES/HKS collaboration meeting, T.Gogami9-11/May/201212

Tracking efficiency HES (EDC1) – 8/10 ・・・・・・ HES/HKS collaboration meeting, T.Gogami9-11/May/201213

Analyzed runs * ch *h2o *li *be *b *c *cr *cr HES/HKS collaboration meeting, T.Gogami9-11/May/201214

Tracking efficiency 1 ….!? Need to check the tracking code HES/HKS collaboration meeting, T.Gogami9-11/May/ ~~~~ HKS (5/6 & 5/6)~~~~~~~ ch2 : Tracking Efficiency : ( %) h2o : Tracking Efficiency : ( %) li : Tracking Efficiency : ( %) be : Tracking Efficiency : ( %) b : Tracking Efficiency : ( %) c : Tracking Efficiency : ( %) cr1 : Tracking Efficiency : ( %) cr2 : Tracking Efficiency : ( % ) ~~~~ HES (8/10) ~~~~~~~ ch2 : Tracking Efficiency : ( %) h2o : Tracking Efficiency : ( %) li : Tracking Efficiency : ( %) be : Tracking Efficiency : ( %) b : Tracking Efficiency : ( %) c : Tracking Efficiency : ( %) cr1 : Tracking Efficiency : ( %) cr2 : Tracking Efficiency : ( %) If there is a bias to use 10/10, 9/10 and 8/10 are possible to be thrown.

Contents 1.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/201216

Events which are discarded 52 Cr, KDC1 KDC2 HES/HKS collaboration meeting, T.Gogami9-11/May/201217

Events which are discarded 52 Cr, KDC1 KDC2 Where and why are these events discarded ? Are these events threw away by correct cut condition? Where and why are these events discarded ? Are these events threw away by correct cut condition? HES/HKS collaboration meeting, T.Gogami9-11/May/201218

Events which are discarded 52 Cr, KDC1 KDC2 Where and why are these events discarded ? Are these events threw away by correct cut condition? 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/201219

Contents 1.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/201220

x-t function calibration |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 HES/HKS collaboration meeting, T.Gogami9-11/May/201221

x-t calibration for 52 Cr Target Residuals better – KDC1 ; 400 [μm]  300 [μm] Number up – ~10% increased at χ 2 <20 – (~5% increased without χ 2 cut) χ 2 cut condition HES/HKS collaboration meeting, T.Gogami9-11/May/201222

Contents 1.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/201223

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/201224

END JLab E collaboration, 2009, JLab Hall-C HES/HKS collaboration meeting, T.Gogami9-11/May/201225

Rates of the KDC Layers CH 2, KDC1 KDC2 ~3 MHz ~6 MHz HES/HKS collaboration meeting, T.Gogami9-11/May/201226

Rates of the KDC Layers H 2 O, KDC1 KDC2 ~10 MHz ~20 MHz HES/HKS collaboration meeting, T.Gogami9-11/May/201227

Rates of the KDC Layers 52 Cr, KDC1 KDC2 ~11 MHz ~22 MHz HES/HKS collaboration meeting, T.Gogami9-11/May/201228

Rates of the KDC wires CH 2, Wire Number Rate [kHz] KDC1-u KDC1-u’KDC1-xKDC1-x’KDC1-vKDC1-v’ KDC2-u KDC2-u’KDC2-xKDC2-x’KDC2-vKDC2-v’ < 150 kHz < 120 kHz < 70 kHz < 60 kHz HES/HKS collaboration meeting, T.Gogami9-11/May/201229

Rates of the KDC wires H 2 O, Wire Number Rate [kHz] KDC1-u KDC1-u’KDC1-xKDC1-x’KDC1-vKDC1-v’ KDC2-u KDC2-u’KDC2-xKDC2-x’KDC2-vKDC2-v’ < 450 kHz < 270 kHz < 250 kHz < 200 kHz HES/HKS collaboration meeting, T.Gogami9-11/May/201230

Rates of the KDC wires 52 Cr, 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 HES/HKS collaboration meeting, T.Gogami9-11/May/201231

x-t calibration for H 2 O Target Residual better Number up – 10% increased at χ 2 <20 HES/HKS collaboration meeting, T.Gogami9-11/May/201232

Singles rate summary Up to ~30 [MHz] Up to ~15 [MHz] HES HKS HKS trigger ~ 10[kHz] HES trigger ~ a few[MHz] HKS-HES Collaboration Meeting, T.Gogami33

B.G. mix rate (real data) a b * hks ntulpe HKS-HES Collaboration Meeting, T.Gogami34

e + simulation SIMULATION To see 1.Number of event 2.Angle & momentum of e + generated in target To see 1.Number of event 2.Angle & momentum of e + generated in target HKS-HES Collaboration Meeting, T.Gogami35

Target thickness dependence (Simulation) H2OH2O 52 Cr 9 Be 12 C CH 2 10 B 7 Li Consistent with B.G. mix rate ! SIMULATION HKS-HES Collaboration Meeting, T.Gogami36

Tracking in HKS (pattern recognition) Make combination of hit wire belong to one space point for tracking pre tracking 1.Test point 2.Space point x y x y HKS-HES Collaboration Meeting, T.Gogami37