Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/124374
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Type: Journal article
Title: Measurement of the suppression and azimuthal anisotropy of muons from heavy-flavor decays in Pb+Pb collisions at √sNN =2.76 TeV with the ATLAS detector
Other Titles: Measurement of the suppression and azimuthal anisotropy of muons from heavy-flavor decays in Pb+Pb collisions at root sNN =2.76 TeV with the ATLAS detector
Author: Aaboud, M.
Aad, G.
Abbott, B.
Abdinov, O.
Abeloos, B.
Abhayasinghe, D.K.
Abidi, S.H.
Abouzeid, O.S.
Abraham, N.L.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Acharya, B.S.
Adachi, S.
Adamczyk, L.
Adelman, J.
Adersberger, M.
Adiguzel, A.
Adye, T.
Affolder, A.A.
et al.
Citation: Physical Review C, 2018; 98(4):044905-1-044905-34
Publisher: American Physical Society
Issue Date: 2018
ISSN: 2469-9985
2469-9993
Statement of
Responsibility: 
M. Aaboud, G. Aad, B. Abbott, O. Abdinov, B. Abeloos ... Paul D. Jackson ... Abhishek Sharma ... et al. (The ATLAS Collaboration)
Abstract: ATLAS measurements of the production of muons from heavy-flavor decays in √ s N N = 2.76 TeV Pb+Pb collisions and √ s = 2.76 TeV p p collisions at the LHC are presented. Integrated luminosities of 0.14 nb − 1 and 570 nb − 1 are used for the Pb+Pb and p p measurements, respectively, which are performed over the muon transverse momentum range 4 < p T < 14 GeV and for five Pb+Pb centrality intervals. Backgrounds arising from in-flight pion and kaon decays, hadronic showers, and misreconstructed muons are statistically removed using a template-fitting procedure. The heavy-flavor muon differential cross sections and per-event yields are measured in p p and Pb+Pb collisions, respectively. The nuclear modification factor R A A obtained from these is observed to be independent of p T , within uncertainties, and to be less than unity, which indicates suppressed production of heavy-flavor muons in Pb+Pb collisions. For the 10% most central Pb+Pb events, the measured R A A is approximately 0.35. The azimuthal modulation of the heavy-flavor muon yields is also measured and the associated Fourier coefficients v n for n = 2 , 3, and 4 are given as a function of p T and centrality. They vary slowly with p T and show a systematic variation with centrality which is characteristic of other anisotropy measurements, such as that observed for inclusive hadrons. The measured R A A and v n values are also compared with theoretical calculations.
Rights: ©2018 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
DOI: 10.1103/PhysRevC.98.044905
Published version: http://dx.doi.org/10.1103/physrevc.98.044905
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