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Elliptic flow of muons from heavy-flavour hadron decays at forward rapidity in Pb–Pb collisions at √sNN=2.76 TeV
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Elliptic flow of muons from heavy-flavour hadron decays at forward rapidity in Pb–Pb collisions at √sNN=2.76 TeV

J. Adam, D. Adamová, M.M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, S. Aiola, A. Akindinov, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.753, 頁碼.41-56
02/2016
DOI: https://doi.org/10.1016/j.physletb.2015.11.059

摘要

ALICE experiment Elliptic flow Heavy-flavour decay muons LHC Pb–Pb collisions Nuclear and High Energy Physics
The elliptic flow, v <sub>2</sub> , of muons from heavy-flavour hadron decays at forward rapidity (2.5<y<4) is measured in Pb–Pb collisions at s <sub>NN</sub> =2.76 TeV with the ALICE detector at the LHC. The scalar product, two- and four-particle Q cumulants and Lee–Yang zeros methods are used. The dependence of the v <sub>2</sub> of muons from heavy-flavour hadron decays on the collision centrality, in the range 0–40%, and on transverse momentum, p <sub>T</sub> , is studied in the interval 3<p <sub>T</sub> <10 GeV/c. A positive v <sub>2</sub> is observed with the scalar product and two-particle Q cumulants in semi-central collisions (10–20% and 20–40% centrality classes) for the p <sub>T</sub> interval from 3 to about 5 GeV/c with a significance larger than 3σ based on the combination of statistical and systematic uncertainties. The v <sub>2</sub> magnitude tends to decrease towards more central collisions and with increasing p <sub>T</sub> . It becomes compatible with zero in the interval 6<p <sub>T</sub> <10 GeV/c. The results are compared to models describing the interaction of heavy quarks and open heavy-flavour hadrons with the high-density medium formed in high-energy heavy-ion collisions.

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