Bulk observables at 5.02 TeV using quasiparticle anisotropic hydrodynamics

Abstract

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 ($$K/\pi $$ K / π ) and proton-to-pion ($$p/\pi $$ p / π ) 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 $$T_0=630$$ T 0 = 630 MeV at $$\tau _0 = 0.25$$ τ 0 = 0.25 fm/c and a constant specific shear viscosity of $$\eta /s=0.159$$ η / s = 0.159 , which corresponds to a peak specific bulk viscosity of $$\zeta /s = 0.048$$ ζ / s = 0.048 . In particular, we find that the momentum dependence of the kaon-to-pion ($$K/\pi $$ K / π ) and proton-to-pion ($$p/\pi $$ p / π ) ratios reported recently by the ALICE collaboration are extremely well described by aHydroQP in the 0–5% centrality class.

Resummed Relativistic Dissipative Hydrodynamics

“…In ref. [78], we showed the kaon-to-pion ratio ratio and also the proton-to-pion yield ratio for multiple different centrality classes with a reasonable agreement to the data at 5.023 TeV for Pb-Pb collisions from ALICE collaboration. The centrality dependence of the kaon-to-pion yield ratio.…”

“…A similar agreement between this model and experimental data is seen across different centrality classes, see Refs. [64,78,82].…”

“…(Right) The centrality dependence of the kaon-to-pion yield ratio. In both panels, the predictions of aHydroQP model are compared to experimental data from the ALICE collaboration in Pb-Pb collisions at √ s NN = 5.02 TeV[78,84].…”

Resummed relativistic dissipative hydrodynamics

“…In this section we present phenomenological comparisons of 3+1D aHydroQP model to experimental data. For the sake of brevity, we present comparisons of a small set of Centrality (%) [ 72,80].…”

Spectral functions of heavy quarkonia in a bulk-viscous quark gluon plasma

“…where T A is the nuclear thickness function and T 0 (0, 0) is the temperature in the center of the overlapping region for the most central collisions. We consider collisions at the LHC with √ s = 5.02 TeV, and take T 0 (0, 0) = 500 MeV [102,103], A = 207, σ = 70 mb [104]. We use the thickness function of a nucleus with uniform density inside a sphere,…”