Effects of initial state fluctuations on the mean transverse momentum
Résumé
We show that in ideal hydrodynamic simulations of heavy-ion collisions, initial state fluctuations result in an increase of the mean transverse momentum of outgoing hadrons, 〈pt〉 . Specifically, 〈pt〉 is larger by a few percent if realistic fluctuations are implemented than with smooth initial conditions, the multiplicity and impact parameter being kept fixed. We show that result can be traced back to the fact that for a given total entropy, the initial energy contained in the fluid is larger if the density profile is bumpy. We discuss the implication of these results for the extraction of the equation of state of QCD from experimental data.
Mots clés
heavy ions
nucleus-nucleus collisions
LHC
equation of state
initial state: fluctuation
quantum chromodynamics: equation of state
heavy ion: scattering
nucleus nucleus: scattering
transverse momentum
boundary condition
impact parameter
hydrodynamics
multiplicity
CERN LHC Coll
fluid
numerical calculations
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