Measurement of pion and proton response and longitudinal shower profiles up to 20 nuclear interaction lengths with the ATLAS Tile calorimeter

0351606 - FZÚ 2011 RIV NL eng J - Journal Article
Adragna, P. - Alexa, C. - Anderson, K. - Lokajíček, Miloš - Němeček, Stanislav - Přibyl, Lukáš
Measurement of pion and proton response and longitudinal shower profiles up to 20 nuclear interaction lengths with the ATLAS Tile calorimeter.
Nuclear Instruments & Methods in Physics Research Section A. Roč. 615, č. 2 (2010), s. 158-181. ISSN 0168-9002. E-ISSN 1872-9576
R&D Projects: GA MŠMT LA08032
Institutional research plan: CEZ:AV0Z10100502
Keywords : ATLAS * calorimetry * test-beam * Monte Carlo simulation * GEANT4 * hadronic shower development * pion–proton response
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 1.142, year: 2010
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TJM-4Y95RDG-1&_user=625012&_coverDate=04%2F01%2F2010&_alid=1542842401&_rdoc=19&_fmt=high&_o

The response of pions and protons in the energy range of 20–180 GeV, produced at CERN's SPS H8 test-beam line in the ATLAS iron–scintillator Tile hadron calorimeter, has been measured. The test-beam configuration allowed the measurement of the longitudinal shower development for pions and protons up to 20 nuclear interaction lengths. It was found that pions penetrate deeper in the calorimeter than protons. However, protons induce showers that are wider laterally to the direction of the impinging particle. Including the measured total energy response, the pion-to-proton energy ratio and the resolution, all observations are consistent with a higher electromagnetic energy fraction in pion-induced showers. The data are compared with GEANT4 simulations using several hadronic physics lists. The measured longitudinal shower profiles are described by an analytical shower parametrization within an accuracy of 5–10%.
Permanent Link: http://hdl.handle.net/11104/0191320