Effects of initial state fluctuations on the mean transverse momentum

Abstract

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, $⟨p_t⟩$. Specifically, $⟨p_t⟩$ 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.

4 pages

References in corpus (3)

• Alternative ansatz to wounded nucleon and binary collision scaling in high-energy nuclear collisions
• Event-by-event hydrodynamics and elliptic flow from fluctuating initial state
• Importance of Granular Structure in the Initial Conditions for the Elliptic Flow

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• Study of Isothermal Compressibility and Speed of Sound in the Hadronic Matter Formed in Heavy-Ion Collision using Unified Formalism
• Parton evolution time dependent transverse shape asymmetry in peripheral Pb-Pb and p-Pb collisions at 5.02 TeV
• Extracting the speed of sound of QCD from transverse momentum fluctuations