Confronting fluctuations of conserved charges in central nuclear collisions at the LHC with predictions from Lattice QCD

Abstract

We construct net baryon number and strangeness susceptibilities as well as correlations between electric charge, strangeness and baryon number from experimental data on the particle production yields at midrapidity of the ALICE Collaboration at CERN. The data were taken in central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$~=~2.76~TeV and cover one unit of rapidity. We show that the resulting fluctuations and correlations are consistent with Lattice QCD results at the chiral crossover pseudocritical temperature $T_c\simeq$ 155 MeV. This agreement lends strong support to the assumption that the fireball created in these collisions is of thermal origin and exhibits characteristic properties expected in QCD at the transition from the quark gluon plasma to the hadronic phase. Since Lattice QCD calculations are performed at a baryochemical potential of ${\mu }_B$ = 0, the comparisons with LHC data are the most direct due to the vanishing baryon transport to midrapidity at these high energies.

5 pages, 4 figures, Proceedings of the XXV International Conference On Ultrarelativistic Nucleus-Nucleus Collisions in Kobe (Quark Matter 2015). Accepted by NPA

References in corpus (4)

• Production of light nuclei and anti-nuclei in pp and Pb-Pb collisions at LHC energies
• K*(892)${}^0$ and $\Phi$(1020) production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Additional Strange Hadrons from QCD Thermodynamics and Strangeness Freeze-out in Heavy Ion Collisions
• Hadron yields and the phase diagram of strongly interacting matter

Cited by in corpus (5)

• Properties of hot and dense matter from relativistic heavy ion collisions
• An overview of experimental results from ultra-relativistic heavy-ion collisions at the CERN LHC: bulk properties and dynamical evolution
• The Role of Baryon Number Conservation in Measurements of Fluctuations
• Statistical moments in superposition models and strongly intensive measures
• Neutral to charged kaon yield fluctuations in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76TeV