Azimuthal Anisotropy of Heavy-Flavor Decay Electrons in p-Pb Collisions at √sNN=5.02 TeV

Abstract

Angular correlations between heavy-flavor decay electrons and charged particles at midrapidity ( | η | < 0.8 ) are measured in p -Pb collisions at √ s N N = 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-flavor hadrons. A Fourier decomposition of the modulation results in a positive second-order coefficient ( v 2 ) for heavy-flavor decay electrons in the transverse momentum interval 1.5 < p T < 4 GeV / c in high-multiplicity events, with a significance larger than 5 σ . The results are compared with those of charged particles at midrapidity and those of inclusive muons at forward rapidity. The v 2 measurement of open heavy-flavor particles at midrapidity in small collision systems could provide crucial information to help interpret the anisotropies observed in such systems.