A layer correlation technique for pion energy calibration at the 2004 ATLAS Combined Beam Test

Author

Grahn, Karl-Johan

Author_Institution

R. Inst. of Technol. (KTH), Stockholm, Sweden

fYear

2009

fDate

Oct. 24 2009-Nov. 1 2009

Firstpage

751

Lastpage

757

Abstract

A new method for calibrating the hadron response of a segmented calorimeter is developed. It is based on a principal component analysis of the calorimeter layer energy deposits, 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 ATLAS calorimeters 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 and 180 GeV, the particle energy is reconstructed within 3% and the energy resolution is improved by about 20% compared to the electromagnetic scale.

Keywords

Monte Carlo methods; energy loss of particles; particle calorimetry; position sensitive particle detectors; ATLAS calorimeters; ATLAS combined beam test; Geant4 Monte Carlo events; calorimeter layer energy deposits; invisible hadronic energy; layer correlation technique; longitudinal shower development; measured energy resolution; pion beams; pion energy calibration; Calibration; Electromagnetic measurements; Energy measurement; Energy resolution; Large Hadron Collider; Mesons; Particle beams; Protons; Testing; Tiles;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record (NSS/MIC), 2009 IEEE

Conference_Location

Orlando, FL

ISSN

1095-7863

Print_ISBN

978-1-4244-3961-4

Electronic_ISBN

1095-7863

Type

conf

DOI

10.1109/NSSMIC.2009.5402211

Filename

5402211