FCal TB2003 Shower profiles: G4/MC - Test beam DATA comparison A.Artamonov and ITEP group /afs/cern.ch/user/g/gorbunov/public/prof_note.pdf.

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FCal TB2003 Shower profiles: G4/MC - Test beam DATA comparison A.Artamonov and ITEP group /afs/cern.ch/user/g/gorbunov/public/prof_note.pdf

S/W details Athena: Atlas release 9.3.0, Geant 4 6.2p01, QGSP 2.6, range cut 30 μ MC analisys: LArG4Analysis TB03 analisys:LArFCALTBCnv ,LArFCALTBAna /LArFCalTBRadialDigitCluster by M. Schram, tile amplitude: parabola fit Same clustering method in MC and data (cylindrical cluster, r=8 cm for electrons, r=19 cm for pions) Rough and “smeared” baricenters (tile counting within the radius)

Event selection, calibration Pions: require FC2 and FC3 be negative Multiple track rejection: BPC Pions: FCal 2 and 3 weight=2

Energy resolution

Baricenter reconstruction

Radial shower profiles 200 GeV Electrons, FCal1

Radial shower profiles 200 GeV Pions, FCal1

Radial shower profiles 200 GeV Pions, FCal2

Radial shower profiles 200 GeV Pions, FCal3

Longitudinal shower profiles 200 GeV Pions

Conclusions Reasonable resolution for the parabola fit method The radial profiles are quite well reproduced by MC for electrons. Pions: satisfactory agreement for FCal1 and poor for FCal2,3 (no noise in MC?, poor description in G4 for tungsten?) The tile geometry causes systematical distortion in the baricenter determination. Can be corrected?

Further work (towards October) Apply “smearing” for total energy and resolution calculations Full signal fit (try VE approach and/or OFC). Channel-to- channel corrections Separate baricenter determination for pions in the three FCal modules. Cluster radius optimization