Azimuthal anisotropy of heavy-flavour decay electrons in p-Pb collisions at $ \sqrt{s_{\rm NN}}$ = 5.02 TeV

The ALICE collaboration
Phys.Rev.Lett. 122 (2019) 072301, 2019.

Abstract (data abstract)
CERN-LHC-ALICE. Angular correlations between heavy-flavour decay electrons and charged particles at mid-rapidity ($|\eta| < 0.8$) are measured in p--Pb collisions at $\sqrt{s_{\rm{NN}}} = 5.02$ TeV. The analysis is carried out for the 0--20\% (high) and 60--100\% (low) multiplicity ranges. The jet contribution in the correlation distribution from high-multiplicity events is removed by subtracting the distribution from low-multiplicity events. An azimuthal modulation remains after removing the jet contribution, similar to previous observations in two-particle angular correlation measurements for light-flavour hadrons. A Fourier decomposition of the modulation results in a positive second-order coefficient ($v_{2}$) for heavy-flavour decay electrons in the transverse momentum interval $1.5 < p_{\rm{T}} < 4$~GeV/$c$ in high-multiplicity events, with a significance larger than $5\sigma$. The results are compared with those of charged particles at mid-rapidity and of inclusive muons at forward rapidity. This is the first $v_2$ measurement of open heavy-flavour particles at mid-rapidity in small collision systems, which could provide crucial information to help interpret the anisotropies observed in such systems.

  • Table 1

    Data from Table 1 of the manuscript


    $V_{2\Delta}^{HFe-ch}$ in bins of $p_T$ for p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV. Charged particles are selected on the range...

  • Table 2

    Data from Table 1 of the manuscript


    Baselines in high-multiplicity collisions ($b_{\rm HM}$) and low-multiplicity collisions ($b_{\rm LM}$) in bins of $p_T$ for p-Pb collisions at $\sqrt{s_{NN}}$...

  • Table 3

    Data from Figure 3


    $v_2^{HFe}$ in bins of $p_T$ for p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV. The systematic and statistical uncertainties correspond to...

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