Open heavy flavour production via semi-leptonic decay muons in Pb+Pb collisions at √sNN = 2.76 TeV with the ATLAS detector at the LHC

Chen, Y. J. 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 Abolins, M. and AbouZeid, O. S. and Abramowicz, H. and Abreu, H. and Acerbi, E. and Acharya, B. S. and Adamczyk, L. and Adams, D. L. and Addy, T. N. and Adelman, J. and Adomeit, S. and Adragna, P. and Adye, T. and Aefsky, S. and Aguilar-Saavedra, J. A. and Agustoni, M. and Aharrouche, M. and Ahlen, S. P. and Ahles, F. and Ahmad, A. and Krasznahorkay, Attila and Pásztor, Gabriella and Tóth, József (2013) Open heavy flavour production via semi-leptonic decay muons in Pb+Pb collisions at √sNN = 2.76 TeV with the ATLAS detector at the LHC. NUCLEAR PHYSICS A, 910-91. pp. 351-354. ISSN 0375-9474

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Abstract

Measurements of heavy quark production and suppression in ultra-relativistic nuclear collisions probe the inter- actions of heavy quarks with the hot, dense medium created in the collisions. ATLAS has measured heavy quark production in √sNN = 2.76 TeV Pb+Pb collisions via semi-leptonic decays of open heavy flavour hadrons to muons. Results are presented for the per-event muon yield as a function of muon transverse momentum, pT, over the range of 4 < pT < 14 GeV. The centrality dependence of the muon yields is characterized by the “central to peripheral” ratio, RCP. Using this measure, muon production from heavy quark decays is found to be suppressed by a centrality- dependent factor that increases smoothly from peripheral to central collisions. Muon production is suppressed by approximately a factor of two in central collisions relative to peripheral collisions. Within the experimental errors, the observed suppression is independent of muon pT for all centralities.

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