PT Journal
AU ATLAS Collaboration (Abat, Eea
   Bernabeu Verdú, J
   Castillo Gimenez, V
   Costa, MJ
   Escobar, C
   Ferrer, A
   Garcia, C
   Gonzalez-Sevilla, S
   Higon-Rodriguez, E
   Lacasta, C
   Marti-Garcia, S
   Mitsou, VA
   Ruiz, A
   Solans, C
   Valero, A
   Valls Ferrer, JA
TI A layer correlation technique for pion energy calibration at the 2004 ATLAS Combined Beam Test
SO Journal of Instrumentation
JI J. Instrum.
PY 2011
BP P06001 - 35pp
VL 6
DI 10.1088/1748-0221/6/06/P06001
LA English
DE Calorimeter methods; Pattern recognition; cluster finding; calibration and fitting methods; Calorimeters; Detector modelling and simulations I (interaction of radiation with matter; interaction of photons with matter; interaction of hadrons with matter; etc)
AB A new method for calibrating the hadron response of a segmented calorimeter is developed and successfully applied to beam test data. It is based on a principal component analysis of energy deposits in the calorimeter layers, exploiting longitudinal shower development information to improve the measured energy resolution. Corrections for invisible hadronic energy and energy lost in dead material in front of and between the calorimeters of the ATLAS experiment were calculated with simulated Geant4 Monte Carlo events and used to reconstruct the energy of pions impinging on the calorimeters during the 2004 Barrel Combined Beam Test at the CERN H8 area. For pion beams with energies between 20 GeV and 180 GeV, the particle energy is reconstructed within 3% and the energy resolution is improved by between 11% and 25% compared to the resolution at the electromagnetic scale.
ER