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

Abstract

Angular correlations between heavy-flavour decay electrons and charged particles at mid-rapidity ($|\eta |<0.8$) are measured in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 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 $1.5<p_{\mathrm{T}}<4$ 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. The $v_2$ measurement of open heavy-flavour particles at mid-rapidity in small collision systems could provide crucial information to help interpret the anisotropies observed in such systems.

18 pages, 3 figures, authors from page 13, published, figures at http://aliceinfo.cern.ch/ArtSubmission/node/4281

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