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

We predict that the mean transverse momentum of charged hadrons 〈pt〉 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 framewor...

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Bibliographic Details
Published in:Physics letters. B 2020-10, Vol.809, p.135749, Article 135749
Main Authors: Gardim, Fernando G., Giacalone, Giuliano, Ollitrault, Jean-Yves
Format: Article
Language:English
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Summary:We predict that the mean transverse momentum of charged hadrons 〈pt〉 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 〈pt〉 is proportional to the speed of sound squared cs2 of the quark-gluon plasma. Based on the value of cs2 from lattice QCD, we expect 〈pt〉 to increase by approximately 18 MeV between 1% and 0.001% centrality in Pb+Pb collisions at sNN=5.02 TeV
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2020.135749