Adele Rimoldi Pavia University INFN CERN G 4

Adele Rimoldi, Pavia University & INFN – CERN G 4 users. Workshop Nov 2002 H 8 Muon Testbeam Simulation and the Physics Validation in Geant 4 CERN - 14 November, 2002 1

Adele Rimoldi, Pavia University & INFN – CERN G 4 users. Workshop Nov 2002 The simulation is also a support l l For testing/tuning other programs There are some additional activities connected with the Geant 4 Simulation for the Muons in H 8 – – 2 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 G 4 users. Workshop Nov 2002 H 8 Testbeam Simulation l Geant 4/data comparisons in the H 8 testbeam – Geometry l – – 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 3

Adele Rimoldi, Pavia University & INFN – CERN G 4 users. Workshop Nov 2002 H 8 Geometry amdb_simrec. H 8. 2002 15º of BIL chamber Fe or Al in front 4950 cm 37 cm from first BIL multilayer 20 cm 4

Adele Rimoldi, Pavia University & INFN – CERN G 4 users. Workshop Nov 2002 H 8 testbeam l detailed simulation – 20 Ge. V muons with the H 8 dp/p Beam profile l Use of electromagnetic processes, well simulated by Geant 4 l – – cut-off on energy deposited, 700 e. V – H 8 threshold equivalent (60 m. V and 25 e- of dp/p primary Eta profile Simulated (%)ionization) for anwith initial 20 Ge. V to the Track vertices gaussian distributed respect beam nominal position Beam opening angle gaussian distributed with sigma +0. 06 rad /Generator/Single. Particle/Eta. Range 0. 258 0. 0049 /Generator/Single. Particle/Phi. Range 90. /Generator/Single. Particle/P_Range 20 20 /Generator/Single. Particle/Mean. Vertex 0 -230 0 /Generator/Single. Particle/Sigma. Vertex 29 0 29 5 dp/p

Adele Rimoldi, Pavia University & INFN – CERN G 4 users. Workshop Nov 2002 Extra hits l electronic noise simulation responsible of 50% of extra hits per event (uncorrelated noise) – l l correlated noise (Physics) simulation additional effect first electronic response evaluation – 6 random hits generated in the MDT chambers and added to the tack hits 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 G 4 users. Workshop Nov 2002 H 8 testbeam Simulation l data/G 4 comparisons – – – l 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 – 10 Kevt from August testbeam H 8 l l Geant 4 – 10* *6 evt no magnetic field with complete physics list (Atlas. Physics. List) no material or with Fe o Al l 7 daq-1_tbmuon_0010907. run Al, no magnetic field daq-1_tbmuon_0010913. run Fe, no magnetic field daq-1_tbmuon_0010917. run no field, no material l 180 Gev 20 Gev

Adele Rimoldi, Pavia University & INFN – CERN G 4 users. Workshop Nov 2002 Fraction of events with extra hits 2002 preliminary 8

Adele Rimoldi, Pavia University & INFN – CERN G 4 users. Workshop Nov 2002 Plans l Review all the results by the next H 8 Workshop – l Plan the studies to be done in Geant 4 with the combined setup – l Already taken data in the last summer testbeam with muon chambers, tilecal and pixels Plan future studies for G 4 validation – 9 CERN: 5 -6 December It is time to ask for special setups with materials