The mean transverse momentum of ultracentral heavy-ion collisions: A new probe of hydrodynamics

被引：26

作者：

Gardim, Fernando G. ^{[1
,2
]}

Giacalone, Giuliano ^{[2
]}

Ollitrault, Jean-Yves ^{[2
]}

机构：

[1] Univ Fed Alfenas, Inst Ciencia & Tecnol, BR-37715400 Pocos De Caldas, MG, Brazil

[2] Univ Paris Saclay, Inst Phys Theor, CEA, CNRS, F-91191 Gif Sur Yvette, France

来源：

PHYSICS LETTERS B | 2020年 / 809卷

关键词：

VISCOSITY; FLOW;

D O I：

10.1016/j.physletb.2020.135749

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We predict that the mean transverse momentum of charged hadrons < p(t)> rises as a function of the charged-particle multiplicity in ultracentral nucleus-nucleus collisions. We explain that this phenomenon has a simple physical origin and represents an unambiguous prediction of the hydrodynamic framework of heavy-ion collisions. We argue that the relative increase of < p(t)> is proportional to the speed of sound squared c(s)(2) of the quark-gluon plasma. Based on the value of c(s)(2) from lattice QCD, we expect < p(t)> to increase by approximately 18 MeV between 1% and 0.001% centrality in Pb+Pb collisions at root s(NN) = 5.02 TeV (C) 2020 The Author(s). Published by Elsevier B.V.

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