Bulk observables at 5.02 TeV using quasiparticle anisotropic hydrodynamics

TL;DR

This paper demonstrates that quasiparticle anisotropic hydrodynamics (aHydroQP) accurately predicts various bulk observables in 5.02 TeV Pb-Pb collisions, aligning well with ALICE experimental data.

Contribution

It introduces aHydroQP as an effective model for describing bulk observables in heavy-ion collisions at LHC energies, with specific initial conditions and viscosity parameters.

Findings

aHydroQP accurately describes identified hadron spectra and ratios.

The model reproduces the transverse momentum and multiplicity distributions.

Excellent agreement with ALICE data for central collisions.

Abstract

We present comparisons between 3+1D quasiparticle anisotropic hydrodynamics (aHydroQP) predictions for a large set of bulk observables and experimental data collected in 5.02 TeV Pb-Pb collisions. We make aHydroQP predictions for identified hadron spectra, identified hadron average transverse momentum, charged particle multiplicity as a function of pseudorapidity, the kaon-to-pion ($K/\pi$) and proton-to-pion ($p/\pi$) ratios, and integrated elliptic flow. We compare to data collected by the ALICE collaboration in 5.02 TeV Pb-Pb collisions. We find that these bulk observables are quite well described by aHydroQP with an assumed initial central temperature of $T_0=630$ MeV at $\tau_0 = 0.25$ fm/c and a constant specific shear viscosity of $\eta/s=0.159$ and a peak specific bulk viscosity of $\zeta/s = 0.048$. In particular, we find that the momentum dependence of the kaon-to-pion ($K/\pi$) and proton-to-pion ($p/\pi$) ratios reported recently by the ALICE collaboration are extremely well described by aHydroQP in the most central collisions.