Skewness of mean transverse momentum fluctuations in heavy-ion collisions

Giacalone, Giuliano; Gardim, Fernando G.; Noronha-Hostler, Jacquelyn; Ollitrault, Jean-Yves

doi:10.1103/physrevc.103.024910

Title: Skewness of mean transverse momentum fluctuations in heavy-ion collisions

Journal Article · Thu Feb 18 00:00:00 EST 2021 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.103.024910· OSTI ID:1836550

^[1]; Gardim, Fernando G. ^[2]; Noronha-Hostler, Jacquelyn ^[3];

^[1]

Univ. Paris-Saclay, Gif-sur-Yvette (France)
Universidade Federal de Alfenas (Brazil)
Univ. of Illinois at Urbana-Champaign, IL (United States)

We propose the skewness of mean transverse momentum, $$\langle{p_t}\rangle$$, fluctuations as a fine probe of hydrodynamic behavior in relativistic nuclear collisions. We describe how the skewness of the $$\langle{p_t}\rangle$$ distribution can be analyzed experimentally, and we use hydrodynamic simulations to predict its value. We predict in particular that $$\langle{p_t}\rangle$$ fluctuations have positive skew, which is significantly larger than if particles were emitted independently. We elucidate the origin of this result by deriving generic formulas relating the fluctuations of $$\langle{p_t}\rangle$$ to the fluctuations of the early-time thermodynamic quantities. We postulate that the large positive skewness of $$\langle{p_t}\rangle$$ fluctuations is a generic prediction of hydrodynamic models.

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Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); Conselho Nacional de Desenvolvimento Cientifico (CNPq); Instituto Nacional de Ciência e Tecnologia: Física Nuclear e Aplicações (INCT-FNA); São Paulo Research Foundation (FAPESP); Univ. of Sao Paulo

Grant/Contract Number:: SC0020633; 312932/2018-9; 464898/2014-5; 2018/24720-6; Uc Ph 160-16, 2015/13

OSTI ID:: 1836550

Journal Information:: Physical Review C, Vol. 103, Issue 2; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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