Measurement of the suppression and azimuthal anisotropy of muons from heavy-flavor decays in Pb plus Pb collisions at <i>√s<sub>NN</sub></i>=2.76 TeV with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2889 more authors) (2018) Measurement of the suppression and azimuthal anisotropy of muons from heavy-flavor decays in Pb plus Pb collisions at <i>√s<sub>NN</sub></i>=2.76 TeV with the ATLAS detector. PHYSICAL REVIEW C, 98 (4). 044905-.

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Abstract

ATLAS measurements of the production of muons from heavy-flavor decays in $\sqrt{s_{\mathrm{NN}}} = 2.76$ TeV Pb+Pb collisions and $\sqrt{s} = 2.76$ TeV $pp$ collisions at the LHC are presented. Integrated luminosities of 0.14 $\mathrm{nb}^{-1}$ and 570 $\mathrm{nb}^{-1}$ are used for the Pb+Pb and $pp$ measurements, respectively, which are performed over the muon transverse momentum range $4 < p_{\mathrm{T}} < 14$ GeV and for five Pb+Pb centrality intervals. Backgrounds arising from in-flight pion and kaon decays, hadronic showers, and mis-reconstructed muons are statistically removed using a template-fitting procedure. The heavy-flavor muon differential cross-sections and per-event yields are measured in $pp$ and Pb+Pb collisions, respectively. The nuclear modification factor $R_{\mathrm{AA}}$ obtained from these is observed to be independent of $p_{\mathrm{T}}$, 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 $R_{\mathrm{AA}}$ 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 $p_{\mathrm{T}}$ and centrality. They vary slowly with $p_{\mathrm{T}}$ and show a systematic variation with centrality which is characteristic of other anisotropy measurements, such as that observed for inclusive hadrons. The measured $R_{\mathrm{AA}}$ and $v_n$ values are also compared with theoretical calculations.

Item Type: Article
Additional Information: 55 pages in total, author list starting page 39, 16 figures, 3 tables, final version published in Phys. Rev. C. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2015-06/
Uncontrolled Keywords: nucl-ex, nucl-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 10 Sep 2018 15:17
Last Modified: 17 Oct 2023 04:59
DOI: 10.1103/PhysRevC.98.044905
Open Access URL: https://doi.org/10.1103/PhysRevC.98.044905
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3026058