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Zhengyun YOU, FVTX Review Nov 2008 1 FVTX Software and Simulation Zhengyun You Los Alamos National Laboratory.

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Presentation on theme: "Zhengyun YOU, FVTX Review Nov 2008 1 FVTX Software and Simulation Zhengyun You Los Alamos National Laboratory."— Presentation transcript:

1 Zhengyun YOU, FVTX Review Nov 2008 1 FVTX Software and Simulation Zhengyun You Los Alamos National Laboratory

2 Zhengyun YOU, FVTX Review Nov 2008 2 Outline Software updates –Simulation –Geometry –Hit response & reconstruction –Tracking Ongoing and future work Software organization

3 Zhengyun YOU, FVTX Review Nov 2008 3 Software Overview Current status: All materials have been updated to current design in simulation Full geometry updated in simulation and offline code New hit response and cluster fitting Track reconstruction algorithm updated To be developed : Phenix Raw Data File (PRDF) generation Alignment and Calibration software Online Monitoring Database Interface Full GEANT3 simulation Digitize hits into Hit Silicon Strips Clusters formed and Centroids Extracted Find FVTX TracksFind Muon Tracks Match MuTr and FVTX Tracks Kalman Filter Fit Extract DCA, other Fit Variables, Analysis Event Generation (PYTHIA, HIJING) Real Data (PRDF)

4 Zhengyun YOU, FVTX Review Nov 2008 4 Simulation Materials fully described in GEANT3 StationFVTX overall Wedge Radiation length on one Station (North St2) Radiation length of one Wedge (North St2, Wedge 1) Wedge projection view Radiation length

5 Zhengyun YOU, FVTX Review Nov 2008 5 Geometry in Offline Old design New design (displayed in ROOT) Offline geometry is fully converted from detector description in GEANT3 to ROOT for consistency, with alignment correction allowed Two versions of design allowed for performance comparison Strips added for full description FVTXStationWedge Strips

6 Zhengyun YOU, FVTX Review Nov 2008 6 Hit response & reconstruction ADC conversion (3 bit) Noise level added Noises added to charge Random noise hits added Cluster finding & Fitting Unweighted Weighted, using ADC Weighted, using true Q Coordinate Resolution (  m) 5 10 15 20 25 30 35 40 45 50 Q (charge) distribution on strips ADC vs. Q (charge) 3 bit (8 bin) conversion threshold ADC conversion Q (charge) 10000 20000 30000 40000 50000 Q (charge) Count 600 500 400 300 200 100 0 ADC

7 Zhengyun YOU, FVTX Review Nov 2008 7 Tracking New track finding algorithm (Columbia) In Au+Au events (highest occupancy environment, but reasonably modest, 3% occupancy) Good FVTX track finding efficiency Good efficiency for matching Muon (MUID+MUTR) tracks and FVTX tracks Expect further tuning to improve performance even further FVTX Track Finding Efficiency (In Au+Au events) MUTR-FVTX Track Matching Efficiency (Prompt muons in Au+Au events)

8 Zhengyun YOU, FVTX Review Nov 2008 8 DCA (Distance of Closest Approach)  prompt Use Kalman Filter to fit and project to z_vertex Get DCA components in r (good) and phi (less good) ~100  m resolution in DCA_r Multiple-scattering dominated resolution Sufficient resolution to separate prompt, heavy quark, and light meson decays DCA_r (with updated geometry and software ) Momentum (GeV/c) DCA_r Resolution (cm) Momentum (GeV/c) DCA_r (old design and simulation in review 2007)

9 Zhengyun YOU, FVTX Review Nov 2008 9 Blind analysis DST (with MC info)DST (without MC info) GEANT Simulation (all sub-detectors in central & muon arms ) Reconstruction with MC Reconstruction Physics Result with MCPhysics Result Event Generation Result comparison Blind to MC Hit response The purpose of blind analysis is to test the performance of VTX/FVTX software, and to show that they are ready for real data analysis Events are generated and simulated with VTX + FVTX + other PHENIX sub-detectors Analyzers only get DST files and are blind to MC information. Analysis results will be compared with MC information. If possible problems exist, they will be found and be fixed until two sides match.

10 Zhengyun YOU, FVTX Review Nov 2008 10 Roadmap Blind analysis Geometry revalidation Test events generation Check Cluster&Track finding Test events analysis Large scale events generationMC Info Events analysis 5/0811/084/09 Result comparison Loop Fix possible problems Alignment tool Database Online Monitoring

11 Zhengyun YOU, FVTX Review Nov 2008 11 Manpower in Blind Analysis CoordinatorAnthony Denis Frawley (FSU) Geometry revalidation Alexandre Lebedev (IASU), Hubert van Hecke (LANL), Zhengyun You (LANL) Barrel vertex finding Alan Dion (IASU), Dave Winter (Columbia) Forward vertex finding Melynda Brooks (LANL), Hugo Pereira (Saclay), Dave Winter (Columbia) Background generation Axel Dress (SUNYSB), Benjamin Bannier (SUNYSB) Event generation Alexandre Lebedev (IASU), Axel Dress (SUNYSB), Benjamin Bannier (SUNYSB) Event analysisLANL, Columbia, NMSU, …

12 Zhengyun YOU, FVTX Review Nov 2008 12 Future Work & Manpower Blind analysis Alignment tool Online monitoring Database interface Software Leader H. v Hecke (LANL) X. Wang (NMSU) GEANT Simu. H.v Hecke (LANL) D. M. Lee (LANL) Offline Software M. Brooks (LANL) Z. You (LANL) X. Wang (NMSU) D. Winter (Columbia) E. Vazquez (Columbia) H.Pereira (Saclay) Analysis LANL, NMSU, Columbia, UNM, Saclay, BNL, … Alignment Z. You (LANL) NMSU Database Columbia Online Monitoring LANL Columbia

13 Zhengyun YOU, FVTX Review Nov 2008 13 Summary Much progress in software updates in this year – All materials described in GEANT3 – Full geometry updated in offline code – New hits response and cluster finding – New track finding algorithm Blind analysis and other work is going well

14 Zhengyun YOU, FVTX Review Nov 2008 14 Backup Slides

15 Zhengyun YOU, FVTX Review Nov 2008 15 FVTX Performance – DCA (In Review 2007) (r) Muon acceptance DCA r-z resolution (cm) Momentum (GeV) Without staggering DCA  -z resolution (cm) Momentum (GeV) With staggering DCA(r) in embedded events same DCA_r DCA_phi

16 Zhengyun YOU, FVTX Review Nov 2008 16 Physics analysis Single Muons –Precise heavy flavor and hadron measurements at forward rapidity –Separation of charm and beauty –W background rejection improved Dimuons –First direct bottom measurement via B  J/  –Separation of J/  from  ’ with improved in resolution and S:B –First Drell-Yan measurements from RHIC –Direct measurement of c-cbar events via  +  - becomes possible Physics –Advance understanding of energy loss, by adding precise heavy flavor measurements of R AA and flow. –First detection of  ’ plus heavy quark allow detailed understanding of vector meson production and modification –Separation/Understanding of Cold Nuclear Matter and QGP effects with rapidity coverage –Precise gluon polarization and sea quark measurements over large x range, fundamental tests of Sivers functions possible

17 Zhengyun YOU, FVTX Review Nov 2008 17 Heavy flavor measurement Signal & Background extracted from PHENIX run2 measurements S/B enhancement for D ->  S/B enhancement for B ->  Full simulation and reconstruction with FVTX

18 Zhengyun YOU, FVTX Review Nov 2008 18 W background rejection Single muon spectrum contributions from: W-->  X Hadron punch-throughs & decays Mis-reconstructed hadrons Tight MuTr cuts plus FVTX cuts improve signal:background by ~10 5 Simulated W signal and background from Run5 background W->  Background before cuts Background after cuts W->  before/after cuts Background reduced by ~10 5 Most of signals kept

19 Zhengyun YOU, FVTX Review Nov 2008 19 Dimuon spectra improvement Au+Au Mass Resolution and Background Rejection Improvement  ’ added to vector meson measurements, J/  improved for given run, precision open heavy flavor added (recombination) QGP and CNM vector meson production understood p+p

20 Zhengyun YOU, FVTX Review Nov 2008 20 Heavy Ion R AA with FVTX Mechanisms for heavy/light quark suppression poorly understood Clear distinction among models –Radiative energy loss (W.Horowitz & S.Wicks et al.) –Radiative and collisional energy loss (M. Djordjevic et al.) –Dissociative energy loss (I. Vitev et al.) FVTX provides discrimination power even without c/b separation

21 Zhengyun YOU, FVTX Review Nov 2008 21 Heavy Ion R AA for charm/beauty Separated Statistical separation of charm and beauty with DCA cuts

22 Zhengyun YOU, FVTX Review Nov 2008 22 Double Spin Asymmetry A LL from pp Measurements of open charm and beauty add decisive information to the quest determining the source of the nucleon spin!

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