• Open Access

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

S. Acharya et al. (ALICE Collaboration)
Phys. Rev. Lett. 122, 072301 – Published 22 February 2019

Abstract

Angular correlations between heavy-flavor decay electrons and charged particles at midrapidity (|η|<0.8) are measured in p-Pb collisions at sNN=5.02TeV. 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 (v2) for heavy-flavor decay electrons in the transverse momentum interval 1.5<pT<4GeV/c in high-multiplicity events, with a significance larger than 5σ. The results are compared with those of charged particles at midrapidity and those of inclusive muons at forward rapidity. The v2 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.

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  • Received 7 June 2018
  • Revised 16 October 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.072301

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2019 CERN, for the ALICE Collaboration

Physics Subject Headings (PhySH)

Nuclear PhysicsAccelerators & Beams

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Vol. 122, Iss. 7 — 22 February 2019

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