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Status of the PANDA Simulations

Status of the PANDA Simulations. Event Generator UrQMD p A MVD Resolution Time of Flight Estimates of Data Rates “Complete” Analysis of pp  Y (3770)DD Updated “to-do” list. p. p,n. g. K. h. L S X. Multiplicity. Mass [GeV/c 2 ]. Using UrQMD for pA (A.Galoyan).

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Status of the PANDA Simulations

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  1. Status of the PANDA Simulations • Event Generator UrQMD p A • MVD Resolution • Time of Flight • Estimates of Data Rates • “Complete” Analysis of ppY(3770)DD • Updated “to-do” list PANDA Collab. Meeting, May 2003

  2. p p,n g K h L S X Multiplicity Mass [GeV/c2] Using UrQMD for pA (A.Galoyan) UrQMD ~OK but must be modified Galoyan&Polanski hep-ph/0304196 Multiplicity distribution Produced Particles p (7 GeV/c) + Fe (10K events) PANDA Collab. Meeting, May 2003

  3. Phase Space Distribution All particles Q vs P Neutron dN/dQ Q PANDA Collab. Meeting, May 2003

  4. MVD Resolution (A.Sokolov) • Investigate MVD resolution with pp4mm (8GeV) • Take small angle scattering into account with a reduced weight for hits in outer layers • Modify pad orientation: 1st and 3rd – 5th layers with pads  to beam 2nd layer || to beam direction • Pad intrinsic resolution 12x70 mm • Increase diameter of the the beam pipe PANDA Collab. Meeting, May 2003

  5. Vertex Resolution • D0 = radial distance • Z0 = longitudinal distance polar angle Q polar angle Q polar angle Q PANDA Collab. Meeting, May 2003

  6. Increased Beam Pipe Diameter PANDA Collab. Meeting, May 2003

  7. Z0 Resolution, R=40 mm Beam Pipe sZ0 increases from ~13 mm to ~18 mm PANDA Collab. Meeting, May 2003

  8. Systematic Error in Z0 PANDA Collab. Meeting, May 2003

  9. Momentum Resolution mean resolution for pp4m events at 8 GeV PANDA Collab. Meeting, May 2003

  10. Time of Flight (C.Schwarz) • Kaon ID in the DIRC starts at about 600 MeV/c • Can Reduce # of DIRC PMTs with ToF • Redundancy • Fast trigger • Resolution ~ 100 ps • Detector type: RPC or scintillator? PANDA Collab. Meeting, May 2003

  11. TOP (Time of Propagation)

  12. DIRC vs ToF DIRC is needed for P>600 MeV/c and ToF for P<600 MeV/c

  13. Estimated Data Rates (P.Salabura+JR) • Number of Readout Channels • Mean Multiplicity • Data per Event • Event rate (107 Hz interactions) PANDA Collab. Meeting, May 2003

  14. Number of Readout Channels • MVD 9.2x106 pixels • STT 8.7x103 wires • MDCT 1.7x103 wires • DIRC 1.0x104 PMTs • EMCT 7.5x103 crystals • RICH 4.5x104 pads • MuonT 3.2x104 cells • +ToF+FS … PANDA Collab. Meeting, May 2003

  15. Mean Multiplicities (pp 8 GeV/c) • MVD 12 hits/evt x 2.5 pads/hit = 30 • STT 94 • MDCT 37 • DIRC 7 bars/evt x 20 PMTs/hit x ½ 70 • EMCT 82 • RICH 1 hit/evt x 15 pads/hit 15 • MuonT 0.26 • +ToF+FS ??? PANDA Collab. Meeting, May 2003

  16. Number of bits per Hit (rounded) • MVD Layer(4)+Coordinate(2x10)+sysID(8) = 32 • STT Layer(4)+Wire(10)+Time(2x10)+sysID(8)= 48 • MDCT Layer(4)+Wire(8)+Time(10)+sysID(8) = 32 • DIRC PMT(14)+E(12)+T(12)+sysID(8) = 48 • EMCT Crystal(13)+E(15)+sysID(8) = 48 • RICH PadNumber(2x8)+sysID(8) = 24 • MuonT Cell(12)+T(12)+ sysID(8) = 32 • +ToF+FS … PANDA Collab. Meeting, May 2003

  17. Total Data Rates (107 Hz) Detector bits/hit Multiplicity Total (GBytes/sec) • MVD 32 30 1.2 • STT 48 94 5.6 • MDCT 32 37 1.5 • DIRC 48 70 4.2 • EMCT 48 82 5 • RICH 24 15 0.5 • MuonT 32 0.25 0.01 • +ToF+FS … ?7? 25 GB/s PANDA Collab. Meeting, May 2003

  18. Analysis of ppY(3770)DD (JR) • Single D±Kp±p± Selector (BR=9.1%) • ppY(3770)DD • Background Estimates report at GSI Docuserver: http://www-new.gsi.de/onTEAM/tree/temp/1053448016/191053014637.ps PANDA Collab. Meeting, May 2003

  19. Vertex Resolution (1 D per event) Force the decay at V=(0.1,0.1,0.4) mm PD=3.3GeV/c Combine + - - or -++ tracks (i.e. no PID) for reconstruction M=1865 sM=7.3 MeV/c2e ~ 0.71 sZ=22 mm VR [mm] VZ [mm] PANDA Collab. Meeting, May 2003

  20. Y(3770)DD K+K-2p++2p- 10,000 Events M+-- [GeV] PANDA Collab. Meeting, May 2003

  21. Decay Vertex Location Transverse Longitudinal D [mm] Z [mm] Only longitudinal coordinate sensitive to D-mesons ! PANDA Collab. Meeting, May 2003

  22. Proper Lifetime Determination N(x) ~ exp{ - |V| M / (P ct) } ct = 292 ± 3 mm input 317 mm |V|M/P PANDA Collab. Meeting, May 2003

  23. DD Kinematical Variables Missing Mass Squared Invariant Mass (Mmiss)2 [GeV2] Minv [GeV] N.B. (Mp)2 ~ 0.02 GeV2 e ~ 31% (no PID) PANDA Collab. Meeting, May 2003

  24. Fake D-Candidates from Background 80,000 Events Vertex Z - Location + - - Inv. Mass Vz [mm] Minv [GeV/c2] PANDA Collab. Meeting, May 2003

  25. Background Suppression Factors 80,000 input background events 6.6 GeV/c 3,144 D-Candidates (no PID!) 196 events with Vz > 0.1 mm 100 events with c2/dof < 10 (vertex fit) 0 events with a D+ & D- candidate estimate of remaining cuts by widening cuts above 1/16000 for the second D candidate 1/50 |(Mmiss)2| < 0.002 GeV2 1/10 Minv ~ s PANDA Collab. Meeting, May 2003

  26. Peak to Background Ratio Assume a Y(3770) formation cross section of 160 nb L=1032  140 Counts/hour (still without PID!!!) PANDA Collab. Meeting, May 2003

  27. Summary • Event Generator UrQMD p A • MVD Resolution • Time of Flight • Estimates of Data Rates • “Complete” Analysis of ppY(3770)DD PANDA Collab. Meeting, May 2003

  28. Status May 2003 Outlook (Feb 2003 Meeting) • pbar-A background generator • Generation of 107 pbar-p background events • Introduction of the absolute time, (in progress) to allow studies of pileup • Add more dead areas/materials • Detailed studies of thresholds, etc. • Layer of ToF between DIRC and EMC • CsI at backward angles? • Can e+e- be selected/triggered (conversion in MVD…) • Improvement of the FastSim • Evaluation of signal/background ratio • Input for Trigger/DAQ • Hypernucleus experiments…

  29. group meeting Wed. 11-13 Outlook 2 • Target (start detector?) • Tof • FS • 3D Fieldmap • Tracking (Kalman) • Kinematic fitters • Trigger simulations • Physics Analysis for specific channels(e.g. Glueballs, DD, leptons,ff, gg, gg*) PANDA Collab. Meeting, May 2003

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