Links

Tools

Export citation

Search in Google Scholar

Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV/$c$ in PbPb collisions at $\sqrt{ s_{\mathrm{NN}} } = $ 5.02 TeV

Published in 2017 by Albert M. Sirunyan, Armen Tumasyan, Wolfgang Adam, Ece Aşılar, Thomas Bergauer, Johannes Brandstetter, Erica Brondolin, Marko Dragicevic, Janos Erö, Martin Flechl, Markus Friedl, Rudolf Fruehwirth, Vasile Mihai Ghete, Christian Hartl, Natascha Hörmann and other authors.
This paper was not found in any repository; the policy of its publisher is unknown or unclear.
This paper was not found in any repository; the policy of its publisher is unknown or unclear.

Full text: Unavailable

Question mark in circle
Preprint: policy unknown
Question mark in circle
Postprint: policy unknown
Question mark in circle
Published version: policy unknown

Abstract

The Fourier coefficients $v_2$ and $v_3$ characterizing the anisotropy of the azimuthal distribution of charged particles produced in PbPb collisions at $\sqrt{ s_{\mathrm{NN}} } = $ 5.02 TeV are measured with data collected by the CMS experiment. The measurements cover a broad transverse momentum range, $p_{\mathrm{T}}= $ 1-100 GeV/$c$. The analysis focuses on $p_{\mathrm{T}} > $ 10 GeV/$c$ range, where anisotropic azimuthal distributions should reflect the path-length dependence of parton energy loss in the created medium. Results are presented in several bins of PbPb collision centrality, spanning the 60% most central events. The $v_2$ coefficient is measured with the scalar product and the multiparticle cumulant methods, which have different sensitivities to the initial-state fluctuations. The values of both methods remain positive up to $p_{\mathrm{T}} ≈ $ 70 GeV/$c$, in all examined centrality classes. The $v_3$ coefficient, only measured with the scalar product method, tends to zero for $p_{\mathrm{T}} \gtrsim $ 20 GeV/$c$. Comparisons between theoretical calculations and data provide new constraints on the path-length dependence of parton energy loss in heavy ion collisions and highlight the importance of the initial-state fluctuations.