Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov H8 Muon Testbeam Simulation CERN - 14 November, 2002 and the Physics Validation in Geant4

Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov The simulation is also a support For testing/tuning other programs There are some additional activities connected with the Geant4 Simulation for the Muons in H8 – T.Baroncelli, F.Petrucci (Rome III)  CALIB reconstruction, autocalibration, physics events – F.Cerutti (CERN), A.Policicchio (Cosenza)  effects of secondaries on the pattern recognition algorithms in the reconstruction with CALIB & MUONBOX

Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov H8 Testbeam Simulation Geant4/data comparisons in the H8 testbeam – Geometry With or without material (Fe o Al) in front to the muon chambers  extra hits presence from interaction between tracks and material can interfere with the reconstruction – Beam Description – Noise and (preliminary) simulation of electronic response  Detailed simulation

Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov H8 Geometry 15º 4950 cm amdb_simrec.H cm 37 cm from first BIL multilayer Fe or Al in front of BIL chamber

Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov H8 testbeam detailed simulation – 20 GeV muons with the H8 dp/p Use of electromagnetic processes, well simulated by Geant4 cut-off on energy deposited, 700eV – H8 threshold equivalent (60mV and 25 e - of primary ionization) – Track vertices gaussian distributed with respect to the nominal position – Beam opening angle gaussian distributed with sigma +0.06rad Simulated dp/p (%) for an initial 20 GeV beam dp/p Beam profile Eta profile /Generator/SingleParticle/EtaRange /Generator/SingleParticle/PhiRange /Generator/SingleParticle/P_Range /Generator/SingleParticle/MeanVertex /Generator/SingleParticle/SigmaVertex

Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov Extra hits electronic noise simulation responsible of 50% of extra hits per event (uncorrelated noise) – random hits generated in the MDT chambers and added to the tack hits correlated noise (Physics) simulation additional effect  first electronic response evaluation – if two hits are recorded in the same MDT tube only the one with lower drift time is retained

Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov H8 testbeam Simulation data/G4 comparisons – Events extra hits content – number of extra hits per event measurement (for each layer (multilayer) of each chamber) – extra hits distribution next to the true track Data – 10Kevt from August testbeam H8 daq-1_tbmuon_ run  Al, no magnetic field daq-1_tbmuon_ run  Fe, no magnetic field daq-1_tbmuon_ run  no field, no material Geant4 – 10* *6evt no magnetic field with complete physics list (AtlasPhysicsList) no material or with Fe o Al 180 Gev 20 Gev

Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov Fraction of events with extra hits 2002 preliminary

Adele Rimoldi, Pavia University & INFN – CERN G4usersWorkshop Nov Plans Review all the results by the next H8 Workshop – CERN: 5-6 December Plan the studies to be done in Geant4 with the combined setup – Already taken data in the last summer testbeam with muon chambers, tilecal and pixels Plan future studies for G4 validation – It is time to ask for special setups with materials