05/09/07 CHEP2007 Stefano Spataro. Simulation and Event Reconstruction inside the PandaRoot Framework. Stefano Spataro. for the collaboration
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1 for the collaboration
2 Overview Introduction on Panda Structure of the framework Event generation Detector implementation Reconstruction
3 The Panda experiment AntiProton Annihilations at Darmstadt Multi purpose detector at FAIR Physics program pp, pa collisions 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 )
4 Software development in Panda In September 2006 Panda collaboration board Developing the code inside FairRoot project see D.Bertini talk h. 16:50 here PandaRoot Debian 3.1 Gentoo SUSE (9, 10.X) Fedora (2, 4, 5) Ubuntu SL (3, 4) 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 Gcc Gcc Gcc Gcc Gcc Gcc compiled and running on more than 10 Linux platforms
5 Cross-check between different distributions
6 PandaRoot framework High versatility Detector geometries, Magnetic field, Event Generation Transport Model Digitization Analysis UrQmd, EvtGen, DPM Geant3, Geant4, (Fluka) VirtualMC Reconstruction
7 Event generation Create physical events for realistic simulation Flat generators Uniform distributions Acceptance, Efficiency, EvtGen generator Handling of complex decay chains Resonances DPM generator Dual Parton Model (string fragmentation) background studies UrQmd interface Microscopic model for nuclear reactions pa collisions
8 Detector implementation: proposed geometry
9 Beam pipe Shashlyk EMC COILS (dipole) Muon Detector Target pipe TPC/STT Forward drift chambers EMC Fwd endcup) view from geometry manager Barrel drift chambers COILS (solenoid) DIRC (Cherenkov) Micro Vertex EMC (barrel/bkw endcup)
10 Detector implementation: magnetic field map [Tesla]
11 Tracking: target spectrometer 3.6 GeV/c (10 evt) TPC TPC Conformal mapping Stt Y [cm] STT µ 1GeV/c σ p ~ 1.4% STT Hough Transformation Stt X [cm]
12 Tracking: forward spectrometer (θ<10 ) Six drift chamber planes Two before the magnetic field Two inside the magnetic field Two after the magnetic field At the moment: Pattern recognition: Principal Component Analysis Momentum reconstruction: Kick parametrization (4 chambers) σ(p) ~ 2% resolution Very fast algorithm (no fit) Good prefit value for RK/Kalman
13 Global Tracking How to have a high resolution tracking? How to merge different detectors? How to deal with field inhomogeneity? Global tracking Kalman Filter genfit Already working for TPC Track Follower GEANE see A.Fontana Poster session Use of the same geometry for simulation and track following!
14 EMC reconstruction 1GeV Barrel (PWO) Full digitization and cluster recognition (common code) 1GeV Forward (Shashlyk) Example: neutral channel in barrel pp h c η c + γ EvtGen (phase space) η c π +π +η π γ+ γ η γ+ γ M(h c ) = 3526 MeV/c 2 P z (p ) = 5609 MeV/c 7 photons in the final state
15 2γ Invariant Mass EMC Reconstruction π η pp h c η c + γ η c π +π +η π γ+ γ η γ+ γ π π η Invariant Mass M(η c ) 2.98 GeV/c 2 η c η c γ Invariant Mass M(h c ) 3.53 GeV/c 2 h c
16 Transport Models Comparison VirtualMC With exactly the same code Changing only one flag µ 1 GeV/c 1 GeV/c Geant 3 Geant 4 Geant 3 Geant 4
17 Geant3 Geant4 Comparison: 1GeV in EMC G4 9.0 EmStandard+EmExtra Fired crystals multiplicity lists/cuts tuning comparison with bench tests Deposited energy (MC) Reconstructed energy (clusters) G4 energy leakage Geant3 Geant4 3MeV threshold per pad Geant3 Geant4
18 EMC Next goal: PID Match tracks with PID detectors 3 PION EVENTS DIRC STT
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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