Spectra and nuclear modification factor of charged hadrons produced in lead-lead collisions at root S-NN=2.76 TeV with the ATLAS detector at the LHC

Balek, P. and Aad, G. and Abajyan, T. and Abbott, B. and Abdallah, J. and Abdel, Khalek S. and Abdelalim, A. A. and Abdinov, O. and Aben, R. and Abi, B. and AbouZeid, O. S. and Abramowicz, H. and Abreu, H. and Acharya, B. S. and Adamczyk, L. and Adams, D. L. and Addy, T. N. and Adelman, J. and Adomeit, S. and Adye, T. and Aefsky, S. and Aguilar-Saavedra, J. A. and Agustoni, M. and Aharrouche, M. and Ahlen, S. P. and Ahmad, A. and Ahsan, M. and Aielli, G. and Akdogan, T. and Åkesson, T. P. A. and Krasznahorkay, Attila and Pásztor, Gabriella and Tóth, József (2013) Spectra and nuclear modification factor of charged hadrons produced in lead-lead collisions at root S-NN=2.76 TeV with the ATLAS detector at the LHC. NUCLEAR PHYSICS A, 904-90. 767C-770C. ISSN 0375-9474

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Abstract

The measurement of charged particle spectra in heavy ion collisions is a way to study properties of hot and dense matter created in these interactions. The centrality dependence of the spectral shape is an important tool to understand the energy loss mechanism. The ATLAS detector at the LHC accumulated integrated luminosity equal to 0.15 nb−1 of lead-lead data at 2.76 TeV per nucleon-nucleon pair. Due to the excellent capabilities of the ATLAS detector, and its stable operation in 2010 and 2011 heavy ion physics runs, these data allow measurements of the charged particle spectra and their ratios in different centrality bins over a wide range of transverse momenta (0.5–150 GeV) and pseudorapidity (|η| < 2.5). The measured ratio central to peripheral events shows a suppresion by a factor of 5 at pT = 7 GeV. At higher pT the ratio increases.

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