The Fourier coefficients v2and v3characterizing 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 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∼60–80 GeV/c, in all examined centrality classes. The v3coefficient, 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.

Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., et al. (2018). Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV/c in PbPb collisions at sqrt(s)(NN)=5.02 TeV. PHYSICS LETTERS. SECTION B, 776, 195-216 [10.1016/j.physletb.2017.11.041].

Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV/c in PbPb collisions at sqrt(s)(NN)=5.02 TeV

Battilana, C.;Bonacorsi, D.;Braibant-Giacomelli, S.;Brigliadori, L.;Campanini, R.;Capiluppi, P.;Castro, A.;Chhibra, S. S.;Codispoti, G.;Cuffiani, M.;Fanfani, A.;Fasanella, D.;Guiducci, L.;Navarria, F. L.;Rossi, A. M.;Rovelli, T.;Siroli, G. P.;Tosi, N.;
2018

Abstract

The Fourier coefficients v2and v3characterizing 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, 110 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 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∼60–80 GeV/c, in all examined centrality classes. The v3coefficient, 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.
2018
Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., et al. (2018). Azimuthal anisotropy of charged particles with transverse momentum up to 100 GeV/c in PbPb collisions at sqrt(s)(NN)=5.02 TeV. PHYSICS LETTERS. SECTION B, 776, 195-216 [10.1016/j.physletb.2017.11.041].
Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Fr...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/625393
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