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Simulation and Event Reconstruction inside the PandaRoot Framework

for the collaboration. Simulation and Event Reconstruction inside the PandaRoot Framework. Stefano Spataro. Overview. Introduction on Panda Structure of the framework Event generation Detector implementation Reconstruction. Multi purpose detector at FAIR.

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Simulation and Event Reconstruction inside the PandaRoot Framework

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  1. for the collaboration Simulation and Event Reconstruction inside the PandaRoot Framework Stefano Spataro

  2. Overview • Introduction on Panda • Structure of the framework • Event generation • Detector implementation • Reconstruction

  3. Multi purpose detector at FAIR Physics program pp, pA collisions 1.515 GeV/c (p momentum) • Charmonium (cc) spectroscopy • Open charm spectroscopy • Search for gluonic excitations (hybrids - glueballs) • Charmed hadrons in nuclei • Single and double Hypernuclei • Other options (Parton Distrib., EM Form Factor…) The Panda experiment AntiProton Annihilations at Darmstadt

  4. In September 2006 Panda collaboration board Developing the code inside FairRoot project Software development in Panda see D.Bertini talk h. 16:50 here PandaRoot • Framework for simulation and analysis • Based on ROOT (5.14) • Virtual Monte-Carlo (VMC 2.0, G4 8.2) • Working on many Linux distributions and with many compilers Debian 3.1 Gentoo SUSE (9, 10.X) Fedora (2, 4, 5) Ubuntu SL (3, 4) … Gcc 3.3.5 Gcc 3.4.2 Gcc 4.0.2 Gcc 4.0.3 Gcc 4.1.4 Gcc 4.1.2 … …compiled and running on more than 10 Linux platforms

  5. Cross-check between different distributions

  6. Detector geometries, Magnetic field,… Event Generation Transport Model Digitization Analysis Geant3, Geant4, (Fluka) PandaRoot framework High versatility Reconstruction UrQmd, EvtGen, DPM… VirtualMC

  7. Flat generators Uniform distributions Handling of complex decay chains EvtGen generator Dual Parton Model (string fragmentation) DPM generator pA collisions Microscopic model for nuclear reactions UrQmd interface Event generation Create physical events for realistic simulation Acceptance, Efficiency, … Resonances background studies

  8. Detector implementation: proposed geometry

  9. Beam pipe COILS (dipole) Muon Detector Target pipe Shashlyk EMC TPC/STT DIRC (Cherenkov) Forward drift chambers Micro Vertex EMC Fwd endcup) view from geometry manager COILS (solenoid) EMC (barrel/Bkw endcup) Barrel drift chambers

  10. [Tesla] Detector implementation: magnetic field map

  11. DPM @ 3.6 GeV/c (10 evt) TPC TPC -@ 1GeV/c p~ 1.4% STT STT Stt Y [cm] Hough Transformation Stt X [cm] Tracking: target spectrometer Conformal mapping

  12. (p) ~ 2% resolution Tracking: forward spectrometer (<10°) Six drift chamber planes • Twobeforethe magnetic field • Twoinsidethe magnetic field • Twoafterthe magnetic field • At the moment: • Pattern recognition: • Principal Component Analysis • Momentum reconstruction: • Kick parametrization (4 chambers) Very fast algorithm (no fit) Good prefit value for RK/Kalman

  13. genfit Kalman Filter Global tracking GEANE Global Tracking • How to have a high resolution tracking? • How to merge different detectors? • How to deal with field inhomogeneity ? Already working for TPC see A.Fontana Poster session Track Follower Use of the same geometry for simulation and track following !

  14. Forward (Shashlyk) Barrel (PWO) Full digitization and cluster recognition (common code)  @ 1GeV  @ 1GeV pp  hc  c+  c °+ °+  ° +    +  M(hc) = 3526 MeV/c2 Pz(p ) = 5609 MeV/c EMC reconstruction Example: neutral channel in barrel EvtGen (phase space) 7 photons in the final state

  15. 2 Invariant Mass pp  hc  c+  c °+ °+  ° +    +  °  c Invariant Mass °° Invariant Mass M(hc) 3.53 GeV/c2 M(c) 2.98 GeV/c2 hc c EMC Reconstruction

  16. VirtualMC With exactly the same code Changing only one flag - @ 1 GeV/c  @ 1 GeV/c Geant 3 Geant 4 Geant 3 Geant 4 Transport Models Comparison

  17. Comparison:  @ 1GeV in EMC Geant3 Geant4 G4 9.0 – EmStandard+EmExtra lists/cuts tuning comparison with bench tests Reconstructed energy (clusters) Deposited energy (MC) 3MeV threshold per pad Geant3 Geant4 Geant3 Geant4 G4 energy leakage Fired crystals multiplicity

  18. EMC DIRC 3 PION EVENTS STT Next goal: PID Match tracks with PID detectors

  19. Summary PandaRoot is now the framework for the Panda full simulation • Features: • Supported and maintained for many Linux/compiler versions • Several event generators for different physics studies • Virtual MonteCarlo -> comparison Geant3, Geant4 (Fluka) • Implementations (after one year): • Spectrometer geometry almost complete • Full reconstruction for many detectors (EMC, STT, TPC, MVD) • Global tracking: ongoing (Kalman + GEANE) • To-do list: • Complete global tracking • Construct the Particle Identification information

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