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Measurement of the suppression and azimuthal anisotropy of muons from heavy-flavor decays in Pb+Pb collisions at √sN N = 2.76 TeV with the ATLAS detector

M Aaboud Marisílvia Donadelli; José Luis La Rosa Navarro; Marco Aurelio Lisboa Leite

Physical Review Letters Woodbury, NY v. 98, n. 4, p. 1-34, 2018

Woodbury, NY 2018

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  • Título:
    Measurement of the suppression and azimuthal anisotropy of muons from heavy-flavor decays in Pb+Pb collisions at √sN N = 2.76 TeV with the ATLAS detector
  • Autor: M Aaboud
  • Marisílvia Donadelli; José Luis La Rosa Navarro; Marco Aurelio Lisboa Leite
  • Assuntos: COLISÕES DE ÍONS PESADOS RELATIVÍSTICOS; Collective Flow; Jets & Heavy Flavor Physics; Photon, Lepton & Quark Production; Quark-Gluon Plasma
  • É parte de: Physical Review Letters Woodbury, NY v. 98, n. 4, p. 1-34, 2018
  • Notas: Disponível em: < https://journals.aps.org/prc/pdf/10.1103/PhysRevC.98.044905 >. Acesso em: 07 dez. 2018
  • Descrição: ATLAS measurements of the production of muons from heavy-flavor decays in √sNN = 2.76 TeV Pb+Pb collisions and √s = 2.76 TeV pp collisions at the LHC are presented. Integrated luminosities of 0.14 nb−1 and 570 nb−1 are used for the Pb+Pb and pp measurements, respectively, which are performed over the muon transverse momentum range 4 < pT < 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 pp and Pb+Pb collisions, respectively. The nuclear modification factor RAA obtained from these is observed to be independent of pT , 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 RAA is approximately 0.35. The azimuthal modulation of the heavy-flavor muon yields is also measured and the associated Fourier coefficients vn for n = 2, 3, and 4 are given as a function of pT and centrality. They vary slowly with pT and show a systematic variation with centrality which is characteristic of other anisotropy measurements, such as that observed for inclusive hadrons. The measured RAA and vn values are also compared with theoretical calculations.
  • Editor: Woodbury, NY
  • Data de criação/publicação: 2018
  • Formato: 34 p.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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