Elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity in Pb-Pb collisions at √s NN = 2.76 TeV
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JHEP09(2016)028.pdf
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2.7 MB
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5c69d1a366532963e17fa8c64af0a119
Date Issued
May 10, 2018
Journal
Journal of High Energy Physics
Publisher
Springer Nature
Citation
Adam, J. et al. “Elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity in Pb-Pb collisions at √s NN = 2.76 TeV.” Journal of High Energy Physics 2016, 9 (September 2016): 28 © 2016 The Author(s)
Version
Final published version
Abstract
The elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity (|y| < 0.7) is measured in Pb-Pb collisions at √sNN = 2.76 TeV with ALICE at the LHC. The particle azimuthal distribution with respect to the reaction plane can be parametrized with a Fourier expansion, where the second coefficient (v₂) represents the elliptic flow. The v₂ coefficient of inclusive electrons is measured in three centrality classes (0–10%, 10–20% and 20–40%) with the event plane and the scalar product methods in the transverse momentum (p[subscript T]) intervals 0.5–13 GeV/c and 0.5–8 GeV/c, respectively. After subtracting the background, mainly from photon conversions and Dalitz decays of neutral mesons, a positive v₂ of electrons from heavy-flavour hadron decays is observed in all centrality classes, with a maximum significance of 5.9σ in the interval 2 < p[subscript T] < 2.5 GeV/c in semi-central collisions (20–40%). The value of v₂ decreases towards more central collisions at low and intermediate p[subscript T] (0.5 < p[subscript T] < 3 GeV/c). The v₂ of electrons from heavy-flavour hadron decays at mid-rapidity is found to be similar to the one of muons from heavy-flavour hadron decays at forward rapidity (2.5 < y < 4). The results are described within uncertainties by model calculations including substantial elastic interactions of heavy quarks with an expanding strongly-interacting medium.
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DOI of Published Version
https://doi.org/10.1007/JHEP09(2016)028
