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Measurement of the suppression and azimuthal anisotropy of muons from heavy-flavor decays in Pb plus Pb collisions at root s(NN)=2.76 TeV with the ATLAS detector

Aaboud, M; Aad, G; Abbott, B; Abdinov, O; Abeloos, B; Abhayasinghe, DK; Abidi, SH; ... Zwalinski, L; + view all (2018) Measurement of the suppression and azimuthal anisotropy of muons from heavy-flavor decays in Pb plus Pb collisions at root s(NN)=2.76 TeV with the ATLAS detector. Physical Review C , 98 (4) , Article 044905. 10.1103/PhysRevC.98.044905. Green open access

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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.

Type: Article
Title: Measurement of the suppression and azimuthal anisotropy of muons from heavy-flavor decays in Pb plus Pb collisions at root s(NN)=2.76 TeV with the ATLAS detector
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevC.98.044905
Publisher version: http://doi.org/10.1103/PhysRevC.98.044905
Language: English
Additional information: Copyright © 2018 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: http://discovery.ucl.ac.uk/id/eprint/10061091
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