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Azimuthal Anisotropy of Charged Particles with Transverse Momentum up to 100 GeV/c in PbPb Collisions at √sNN = 5.02 TeV

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Date
2018
Author
Sirunyan, A.M.
Tumasyan, A.
Adam, W.
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Abstract
The Fourier coefficients v2 and v3 characterizing the anisotropy of the azimuthal distribution of charged particles produced in PbPb collisions at √sNN = 5.02 TeV are measured with data collected by the CMS experiment. The measurements cover a broad transverse momentum range, 1 < pT < 100 GeV/c. The analysis focuses on the pT > 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 v2 coefficient is measured with the scalar product and the multiparticle cumulant methods, which have different sensitivities to initial-state fluctuations. The values from both methods remain positive up to pT ∼ 60–80 GeV/c, in all examined centrality classes. The v3 coefficient, only measured with the scalar product method, tends to zero for pT 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
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https://doi.org/10.1016/j.physletb.2017.11.041
https://www.scopus.com/inward/record.url?eid=2-s2.0-85037663555&partnerID=40&md5=90c188773fc5b7542778fbfd17145b7d
http://hdl.handle.net/11655/21912
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  • Fizik Mühendisliği Bölümü Makale Koleksiyonu [723]
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