The Fourier coefficients v2and v3characterizing the anisotropy of the azimuthal distribution of charged particles produced in PbPb collisions at √sNN=5.02TeVare measured with data collected by the CMS experiment. The measurements cover a broad transverse momentum range, 1 <100GeV/c. The analysis focuses on the pT>10GeV/crange, 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 v2coefficient 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∼60–80GeV/c, in all examined centrality classes. The v3coefficient, only measured with the scalar product method, tends to zero for pT _20GeV/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.
(2018). Azimuthal anisotropy of charged particles with transverse momentum up to 100GeV/cin PbPb collisions at √sNN=5.02TeV [journal article - articolo]. In PHYSICS LETTERS. SECTION B. Retrieved from http://hdl.handle.net/10446/140506
Azimuthal anisotropy of charged particles with transverse momentum up to 100GeV/cin PbPb collisions at √sNN=5.02TeV
Re, V.;Vai, I.;
2018-01-01
Abstract
The Fourier coefficients v2and v3characterizing the anisotropy of the azimuthal distribution of charged particles produced in PbPb collisions at √sNN=5.02TeVare measured with data collected by the CMS experiment. The measurements cover a broad transverse momentum range, 1 <100GeV/c. The analysis focuses on the pT>10GeV/crange, 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 v2coefficient 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∼60–80GeV/c, in all examined centrality classes. The v3coefficient, only measured with the scalar product method, tends to zero for pT _20GeV/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.File | Dimensione del file | Formato | |
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