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.

Non-Gaussian elliptic-flow fluctuations in PbPb collisions at sNN=5.02TeV / Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., Brandstetter, J., Brondolin, E., Dragicevic, M., Ero, J., Flechl, M., Friedl, M., Fruhwirth, R., Ghete, V.M., Grossmann, J., Hrubec, J., Jeitler, M., Konig, A., Krammer, N., Kratschmer, I., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 789:(2019), pp. 643-665. [10.1016/j.physletb.2018.11.063]

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

Cipriani M.;Del Re D.;Longo E.;Organtini G.;Paramatti R.;Rahatlou S.;Santanastasio 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.
2019
event-by-event elliptic flow; Non-Gaussian flow fluctuations; unfolding
01 Pubblicazione su rivista::01a Articolo in rivista
Non-Gaussian elliptic-flow fluctuations in PbPb collisions at sNN=5.02TeV / Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., Brandstetter, J., Brondolin, E., Dragicevic, M., Ero, J., Flechl, M., Friedl, M., Fruhwirth, R., Ghete, V.M., Grossmann, J., Hrubec, J., Jeitler, M., Konig, A., Krammer, N., Kratschmer, I., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 789:(2019), pp. 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/11573/1354431
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