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

Sirunyan, A. M.; Cabrillo Bartolomé, José Iban; Calderón Tazón, Alicia; Chazín Quero, Bárbara; Curras Rivera, Esteban; Duarte Campderros, Jorge; Fernández García, Marcos; García Ferrero, Juan; Gómez Gramuglio, Gervasio; López Virto, María Amparo; Marco de Lucas, Jesús; Martínez Rivero, Celso; Martínez Ruiz del Árbol, Pablo; Matorras Weinig, Francisco; Piedra Gómez, Jonatan; Rodrigo Anoro, Teresa; Ruiz Jimeno, Alberto; Scodellaro, Luca; Trevisani, Nicolo; Vila Álvarez, Iván; Vilar Cortabitarte, Rocío

doi:10.1016/j.physletb.2018.11.063

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Identificadores

URI: http://hdl.handle.net/10902/18401

DOI: 10.1016/j.physletb.2018.11.063

ISSN: 0370-2693

ISSN: 1873-2445

Fecha

2019-02

Derechos

Attribution 4.0 International

Publicado en

Physics Letters B 789 (2019) 643-665

Editorial

Elsevier

Enlace a la publicación

https://doi.org/10.1016/j.physletb.2018.11.063

Palabras clave

Event-by-event elliptic flow

Non-Gaussian flow fluctuations

Unfolding

Resumen/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<pT<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.

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