CERN Accelerating science

Article
Report number	physics/0505127
Title	Position resolution and particle identification with the ATLAS EM calorimeter
Related title	A TOROIDAL LHC APPARATUS LARGE HADRON COLLIDER
Author(s)	Colas, J. (Annecy, LAPP) ; Di Ciaccio, L. (Annecy, LAPP) ; El Kacimi, M. (Annecy, LAPP) ; Gaumer, O. (Annecy, LAPP) ; Gouanere, M. (Annecy, LAPP) ; Goujdami, D. (Annecy, LAPP) ; Lafaye, R. (Annecy, LAPP) ; Maner, C.Le (Annecy, LAPP) ; Neukermans, L. (Annecy, LAPP) ; Perrodo, P. (Annecy, LAPP) ; Poggioli, L. (Annecy, LAPP) ; Prieur, D. (Annecy, LAPP) ; Przysiezniak, H. (Annecy, LAPP) ; Sauvage, G. (Annecy, LAPP) ; Wingerter-Seez, I. (Annecy, LAPP) ; Zitoun, R. (Annecy, LAPP) ; Lanni, F. (Brookhaven) ; Ma, H. (Brookhaven) ; Rajagopalan, S. (Brookhaven) ; Rescia, S. (Brookhaven) ; Takai, H. (Brookhaven) ; Belymam, A. (Casablanca U.) ; Benchekroun, D. (Casablanca U.) ; Hakimi, M. (Casablanca U.) ; Hoummada, A. (Casablanca U.) ; Barberio, E. (Southern Methodist U.) ; Gao, Y.S. (Southern Methodist U.) ; Lu, L. (Southern Methodist U.) ; Stroynowski, R. (Southern Methodist U.) ; Aleksa, M. (CERN) ; Beck Hansen, J. (CERN) ; Carli, T. (CERN) ; Fassnacht, P. (CERN) ; Gianotti, F. (CERN) ; Hervas, L. (CERN) ; Lampl, W. (CERN) ; Belhorma, B. (LPSC, Grenoble) ; Collot, Johann (LPSC, Grenoble) ; Gallin-Martel, M.L. (LPSC, Grenoble) ; Hostachy, J.Y. (LPSC, Grenoble) ; Ledroit, Fabienne (LPSC, Grenoble) ; Martin, P. (LPSC, Grenoble) ; Malek, Fairouz (LPSC, Grenoble) ; Saboumazrag, S. (LPSC, Grenoble) ; Viret, S. (LPSC, Grenoble) ; Leltchouk, M. (Nevis Labs, Columbia U.) ; Parsons, J.A. (Nevis Labs, Columbia U.) ; Seman, M. (Nevis Labs, Columbia U.) ; Barreiro, F. (Madrid, Autonoma U.) ; Del Peso, J. (Madrid, Autonoma U.) ; Labarga, L. (Madrid, Autonoma U.) ; Oliver, C. (Madrid, Autonoma U.) ; Rodier, S. (Madrid, Autonoma U.) ; Barrillon, P. (Marseille, CPPM) ; Benchouk, C. (Marseille, CPPM) ; Djama, F. (Marseille, CPPM) ; Duval, P.Y. (Marseille, CPPM) ; Henry-Couannier, Frederic (Marseille, CPPM) ; Hubaut, F. (Marseille, CPPM) ; Monnier, E. (Marseille, CPPM) ; Pralavorio, P. (Marseille, CPPM) ; Sauvage, D. (Marseille, CPPM) ; Serfon, C. (Marseille, CPPM) ; Tisserant, S. (Marseille, CPPM) ; Toth, J. (Marseille, CPPM ; Budapest, RMKI) ; Banfi, D. (Milan U. ; INFN, Milan) ; Carminati, L. (Milan U. ; INFN, Milan) ; Cavalli, D. (Milan U. ; INFN, Milan) ; Costa, G. (Milan U. ; INFN, Milan) ; Delmastro, M. (Milan U. ; INFN, Milan) ; Fanti, M. (Milan U. ; INFN, Milan) ; Mandelli, L. (Milan U. ; INFN, Milan) ; Tartarelli, G.F. (Milan U. ; INFN, Milan) ; Kotov, K. (Novosibirsk, IYF) ; Maslennikov, A. (Novosibirsk, IYF) ; Pospelov, G. (Novosibirsk, IYF) ; Tikhonov, Yu. (Novosibirsk, IYF) ; Bourdarios, C. (Orsay, LAL) ; de La Taille, C. (Orsay, LAL) ; Fayard, L. (Orsay, LAL) ; Fournier, D. (Orsay, LAL) ; Iconomidou-Fayard, L. (Orsay, LAL) ; Kado, M. (Orsay, LAL) ; Lechowski, M. (Orsay, LAL) ; Parrour, G. (Orsay, LAL) ; Puzo, P. (Orsay, LAL) ; Rousseau, D. (Orsay, LAL) ; Sacco, R. (Orsay, LAL) ; Seguin-Moreau, N. (Orsay, LAL) ; Serin, L. (Orsay, LAL) ; Unal, G. (Orsay, LAL) ; Zerwas, D. (Orsay, LAL) ; Dekhissi, B. (Oujda U.) ; Derkaoui, J. (Oujda U.) ; El Kharrimm, A. (Oujda U.) ; Maaroufi, F. (Oujda U.) ; Camard, A. (Paris U., VI-VII) ; Lacour, D. (Paris U., VI-VII) ; Laforge, B. (Paris U., VI-VII) ; Nikolic-Audit, Irina (Paris U., VI-VII) ; Schwemling, Ph. (Paris U., VI-VII) ; Ghazlane, H. (Rabat U. ; CNESTEN, Rabat) ; Cherkaoui El Moursli, R. (Rabat U.) ; Idrissi Fakhr-Eddine, A. (Rabat U.) ; Boonekamp, M. (DAPNIA, Saclay) ; MansouliLe, B. (DAPNIA, Saclay) ; Meyer, P. (DAPNIA, Saclay) ; Schwindling, J. (DAPNIA, Saclay) ; Lund-Jensen, B. (Royal Inst. Tech., Stockholm) ; Tayalati, Y. (Royal Inst. Tech., Stockholm)
Collaboration	for the ATLAS Electromagnetic Liquid Argon Calorimeter Group
Publication	2005
Imprint	18 May 2005
Number of pages	32
In:	Nucl. Instrum. Methods Phys. Res., A 550 (2005) 96-115
DOI	10.1016/j.nima.2005.05.041
Subject category	Other Fields of Physics
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	In the years between 2000 and 2002 several pre-series and series modules of the ATLAS EM barrel and end-cap calorimeter were exposed to electron, photon and pion beams. The performance of the calorimeter with respect to its finely segmented first sampling has been studied. The polar angle resolution has been found to be in the range 50-60 mrad/sqrt(E (GeV)). The neutral pion rejection has been measured to be about 3.5 for 90% photon selection efficiency at pT=50 GeV/c. Electron-pion separation studies have indicated that a pion fake rate of (0.07-0.5)% can be achieved while maintaining 90% electron identification efficiency for energies up to 40 GeV.

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