Measurements of azimuthal anisotropies at forward and backward rapidity with muons in high-multiplicity p-Pb collisions at √sNN=8.16 TeV



Acharya, S, Adamova, D, Adler, A, Rinella, G Aglieri, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, S, Ahn, SU, Ahuja, I
et al (show 1020 more authors) (2023) Measurements of azimuthal anisotropies at forward and backward rapidity with muons in high-multiplicity p-Pb collisions at √sNN=8.16 TeV PHYSICS LETTERS B, 846. p. 137782. ISSN 0370-2693, 1873-2445

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Abstract

The study of the azimuthal anisotropy of inclusive muons produced in p–Pb collisions at s<inf>NN</inf>=8.16 TeV, using the ALICE detector at the LHC is reported. The measurement of the second-order Fourier coefficient of the particle azimuthal distribution, v<inf>2</inf>, is performed as a function of transverse momentum p<inf>T</inf> in the 0–20% high-multiplicity interval at both forward (2.03<y<inf>CMS</inf><3.53) and backward (−4.46<y<inf>CMS</inf><−2.96) rapidities over a wide p<inf>T</inf> range, 0.5<p<inf>T</inf><10 GeV/c, in which a dominant contribution of muons from heavy-flavour hadron decays is expected at p<inf>T</inf>>2 GeV/c. The v<inf>2</inf> coefficient of inclusive muons is extracted using two different techniques, namely two-particle cumulants, used for the first time for heavy-flavour measurements, and forward–central two-particle correlations. Both techniques give compatible results. A positive v<inf>2</inf> is measured at both forward and backward rapidities with a significance larger than 4.7σ and 7.6σ, respectively, in the interval 2<p<inf>T</inf><6 GeV/c. Comparisons with previous measurements in p–Pb collisions at s<inf>NN</inf>=5.02 TeV, and with AMPT and CGC-based theoretical calculations are discussed. The findings impose new constraints on the theoretical interpretations of the origin of the collective behaviour in small collision systems.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 13 Aug 2024 13:14
Last Modified: 22 May 2026 17:08
DOI: 10.1016/j.physletb.2023.137782
Open Access URL: https://doi.org/10.1016/j.physletb.2023.137782
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3183671
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