13–17 sept. 2021
São José dos Campos, Brazil
Fuseau horaire America/Sao_Paulo

Measuring the speed of sound of the quark-gluon plasma in ultracentral nucleus-nucleus collisions

13 sept. 2021, 16:03
1m
São José dos Campos, Brazil

São José dos Campos, Brazil

Instituto Tecnológico de Aeronáutica
Poster Poster

Orateur

Fernando G Gardim (Federal University of Alfenas - BRA)

Description

We show that, within the hydrodynamic framework of heavy-ion collisions, the mean transverse momentum of charged hadrons ($\langle p_t \rangle $) rises as a function of the multiplicity in ultra-central nucleus-nucleus collisions. The relative increase is proportional to the speed of sound squared ($c_s^2$) of the
quark-gluon plasma, that is therefore accessible experimentally using ultra-central data. Based on the value of $c_s^2$ calculated in lattice QCD, we predict that $\langle p_t \rangle $ increases by $\approx$ 18 MeV between 1$\%$ and 0.001$\%$ centrality in Pb+Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV.

Auteurs principaux

Fernando G Gardim (Federal University of Alfenas - BRA) Dr Jean-Yves Ollitrault (Saclay) Mlle Giuliano Giacalone (SACLAY)

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