Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV/c in PbPb collisions at s<inf>NN</inf>=5.02 TeV

Date Issued
10-01-2018
Author(s)
Sirunyan, A. M.
Tumasyan, A.
Adam, W.
Asilar, E.
Bergauer, T.
Brandstetter, J.
Brondolin, E.
Dragicevic, M.
Erö, J.
Flechl, M.
Friedl, M.
Frühwirth, R.
Ghete, V. M.
Hartl, C.
Hörmann, N.
Hrubec, J.
Jeitler, M.
König, A.
Krätschmer, I.
Liko, D.
Matsushita, T.
Mikulec, I.
Rabady, D.
Rad, N.
Rahbaran, B.
Rohringer, H.
Schieck, J.
Strauss, J.
Waltenberger, W.
Wulz, C. E.
Dvornikov, O.
Makarenko, V.
Mossolov, V.
Suarez Gonzalez, J.
Zykunov, V.
Shumeiko, N.
Alderweireldt, S.
De Wolf, E. A.
Janssen, X.
Lauwers, J.
Van De Klundert, M.
Van Haevermaet, H.
Van Mechelen, P.
Van Remortel, N.
Van Spilbeeck, A.
Abu Zeid, S.
Blekman, F.
D'Hondt, J.
Daci, N.
De Bruyn, I.
Deroover, K.
Lowette, S.
Moortgat, S.
Moreels, L.
Olbrechts, A.
Python, Q.
Skovpen, K.
Tavernier, S.
Van Doninck, W.
Van Mulders, P.
Van Parijs, I.
Brun, H.
Clerbaux, B.
De Lentdecker, G.
Delannoy, H.
Fasanella, G.
Favart, L.
Goldouzian, R.
Grebenyuk, A.
Karapostoli, G.
Lenzi, T.
Léonard, A.
Luetic, J.
Maerschalk, T.
Marinov, A.
Randle-conde, A.
Seva, T.
Vander Velde, C.
Vanlaer, P.
Vannerom, D.
Yonamine, R.
Zenoni, F.
Zhang, F.
Cimmino, A.
Cornelis, T.
Dobur, D.
Fagot, A.
Gul, M.
Khvastunov, I.
Poyraz, D.
Salva, S.
Schöfbeck, R.
Tytgat, M.
Van Driessche, W.
Yazgan, E.
Zaganidis, N.
Bakhshiansohi, H.
Beluffi, C.
Bondu, O.
Brochet, S.
DOI
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.
Volume
776
Subjects