Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV/c in PbPb collisions at sNN=5.02 TeV

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Asilar, Ece and Bergauer, Thomas and Md. Ali, Mohd. Adli (2018) Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV/c in PbPb collisions at sNN=5.02 TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 776. pp. 195-216. ISSN 0370-2693

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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.

Item Type:	Article (Journal)
Additional Information:	7861/65013
Uncontrolled Keywords:	CMS; QGP; High-pT; Flow; Parton energy loss; Jet quenching
Subjects:	Q Science > QC Physics Q Science > QD Chemistry
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	Engku Norulizati Engku Aziz
Date Deposited:	23 Jul 2018 10:06
Last Modified:	24 Jan 2019 10:00
URI:	http://irep.iium.edu.my/id/eprint/65013

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