Event-by-event fluctuations in the elliptic-flow coefficient v2 are studied in PbPb collisions at sNN=5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v2) for charged particles with transverse momentum 0.3<3.0GeV/c and pseudorapidity |η|<1.0 are determined for different collision centrality classes. The moments of the p(v2) distributions are used to calculate the v2 coefficients based on cumulant orders 2, 4, 6, and 8. A rank ordering of the higher-order cumulant results and nonzero standardized skewness values obtained for the p(v2) distributions indicate non-Gaussian initial-state fluctuations. Bessel–Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy.

Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., et al. (2019). Non-Gaussian elliptic-flow fluctuations in PbPb collisions at sNN=5.02TeV. PHYSICS LETTERS. SECTION B, 789, 643-665 [10.1016/j.physletb.2018.11.063].

Non-Gaussian elliptic-flow fluctuations in PbPb collisions at sNN=5.02TeV

Dinardo M. E.;Ghezzi A.;Govoni P.;Paganoni M.;Tabarelli de Fatis T.;Lucchini M. T.;De Guio F.;
2019

Abstract

Event-by-event fluctuations in the elliptic-flow coefficient v2 are studied in PbPb collisions at sNN=5.02 TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v2) for charged particles with transverse momentum 0.3<3.0GeV/c and pseudorapidity |η|<1.0 are determined for different collision centrality classes. The moments of the p(v2) distributions are used to calculate the v2 coefficients based on cumulant orders 2, 4, 6, and 8. A rank ordering of the higher-order cumulant results and nonzero standardized skewness values obtained for the p(v2) distributions indicate non-Gaussian initial-state fluctuations. Bessel–Gaussian and elliptic power fits to the flow distributions are studied to characterize the initial-state spatial anisotropy.
Articolo in rivista - Articolo scientifico
Event-by-event elliptic flow; Non-Gaussian flow fluctuations; Unfolding
English
2019
789
643
665
none
Sirunyan, A., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., et al. (2019). Non-Gaussian elliptic-flow fluctuations in PbPb collisions at sNN=5.02TeV. PHYSICS LETTERS. SECTION B, 789, 643-665 [10.1016/j.physletb.2018.11.063].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/286603
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