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Elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity in Pb-Pb collisions at √sNN=2.76 TeV

Adam, J.; Adamova, D.; Aggarwal, M.M; Aglieri Rinella, G; Agnello, M.; Agrawal, N; Christiansen, Peter LU ; Ljunggren, Martin LU ; Oskarsson, Anders LU and Richert, Tuva LU , et al. (2016) In Journal of High Energy Physics 2016(9).
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 (pT) 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... (More)
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 (pT) 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 < pT < 2.5 GeV/c in semi-central collisions (20–40%). The value of v2 decreases towards more central collisions at low and intermediate pT (0.5 < pT < 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.[Figure not available: see fulltext.] © 2016, The Author(s). (Less)
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Heavy Ion Experiments
in
Journal of High Energy Physics
volume
2016
issue
9
publisher
Springer
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  • scopus:84987618942
  • wos:000382886300001
ISSN
1126-6708
DOI
10.1007/JHEP09(2016)028
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English
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1223aefb-15ea-4853-92a4-cfcf82ddadce
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@article{1223aefb-15ea-4853-92a4-cfcf82ddadce,
  abstract     = {The elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity (|y| &lt; 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 (pT) 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 &lt; pT &lt; 2.5 GeV/c in semi-central collisions (20–40%). The value of v2 decreases towards more central collisions at low and intermediate pT (0.5 &lt; pT &lt; 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 &lt; y &lt; 4). The results are described within uncertainties by model calculations including substantial elastic interactions of heavy quarks with an expanding strongly-interacting medium.[Figure not available: see fulltext.] © 2016, The Author(s).},
  articleno    = {28},
  author       = {Adam, J. and Adamova, D. and Aggarwal, M.M and Aglieri Rinella, G and Agnello, M. and Agrawal, N and Christiansen, Peter and Ljunggren, Martin and Oskarsson, Anders and Richert, Tuva and Silvermyr, David and Stenlund, Evert and Vislavicius, Vytautas and , },
  issn         = {1126-6708},
  keyword      = {Heavy Ion Experiments},
  language     = {eng},
  number       = {9},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {Elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity in Pb-Pb collisions at √sNN=2.76 TeV},
  url          = {http://dx.doi.org/10.1007/JHEP09(2016)028},
  volume       = {2016},
  year         = {2016},
}