Predictions for 5.023 TeV Pb+Pb collisions at the LHC

Abstract

We compute predictions for various low-transverse-momentum bulk observables in $\sqrt{s_{NN}}=5.023$ TeV Pb+Pb collisions at the LHC from the event-by-event next-to-leading-order perturbative-QCD + saturation + viscous hydrodynamics ("EKRT") model. In particular, we consider the centrality dependence of charged hadron multiplicity, flow coefficients of the azimuth-angle asymmetries and correlations of event-plane angles. The centrality dependencies of the studied observables are predicted to be very similar to those at 2.76 TeV, and the magnitudes of the flow coefficients and event-plane angle correlations are predicted to be close to those at 2.76 TeV. The flow coefficients may, however, offer slightly more discriminating power on the temperature dependence of QCD matter viscosity than the 2.76 TeV measurements. Our prediction for the multiplicity in the 0-5\% centrality class, obtained using the two temperature-dependent shear-viscosity-to-entropy ratios that give the best overall fit to RHIC and LHC data is $d{N}_{\mathrm{ch}}/d\eta {|}_{|\eta |\le 0.5}=1876\dots 2046$. We also predict a power-law increase from 200 GeV Au+Au collisions at RHIC to 2.76 and 5.023 TeV Pb+Pb collisions at the LHC, $d{N}_{\mathrm{ch}}/d\eta {|}_{|\eta |\le 0.5}\propto s^{0.164\dots 0.174}$.

8 pages, 7 figures

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