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Elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity in Pb-Pb collisions at $ \sqrt{{\mathrm{s}}_{\mathrm{NN}}}=2.76 $ TeV

The ALICE collaboration
JHEP 1609 (2016) 028, 2016

Abstract (data abstract)
CERN-LHC. The elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity ($|y|$ $<$ 0.7) is measured in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ 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 ($v_{\rm 2}$) represents the elliptic flow. The $v_{\rm 2}$ 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 ($p_{\rm T}$) 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 $v_{\rm 2}$ of electrons from heavy-flavour hadron decays is observed in all centrality classes, with a maximum significance of $5.9\sigma$ in the interval $2 <$ $p_{\rm T}$ $<$ 2.5 GeV/$c$ in semi-central collisions (20-40%). The value of $v_{\rm 2}$ decreases towards more central collisions at low and intermediate $p_{\rm T}$ (0.5 $<$ $p_{\rm T}$ $<$ 3 GeV/$c$). The $v_{\rm 2}$ 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.

  • Table 1

    Data from Figure 8, left panel

    10.17182/hepdata.73972.v1/t1

    Elliptic flow of electrons from heavy flavour hadron decays as a function of transverse momentum at midrapidity in the 0--10%...

  • Table 2

    Data from Figure 8, middle panel

    10.17182/hepdata.73972.v1/t2

    Elliptic flow of electrons from heavy flavour hadron decays as a function of transverse momentum at midrapidity in the 10--20%...

  • Table 3

    Data from Figure 8, right panel

    10.17182/hepdata.73972.v1/t3

    Elliptic flow of electrons from heavy flavour hadron decays as a function of transverse momentum at midrapidity in the 20--40%...

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