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

被引：22
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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页数：4
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