Bulk observables at 5.02 TeV using quasiparticle anisotropic hydrodynamics

We compare predictions of 3+1D quasiparticle anisotropic hydrodynamics (aHydroQP) for a large set of bulk observables with experimental data collected in 5.02 TeV Pb-Pb collisions. We make 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, identified particle and charged particle elliptic flow, and HBT radii. We compare to data collected by the ALICE collaboration in 5.02 TeV Pb-Pb collisions. We find that, based on available data, these bulk observables are 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, which corresponds to 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 0-5% centrality class.

Automated summary

Based on experimental data, 3+1D quasiparticle anisotropic hydrodynamics can well describe bulk observables in 5.02 TeV Pb-Pb collisions, especially showing excellent descriptive capability for the momentum dependence of K/pi and p/pi ratios in the 0-5% centrality class reported by the ALICE collaboration.