Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Heavy-Ion Collisions and QCD Phases IX

HK 36.3: Talk

Wednesday, April 1, 2020, 17:15–17:30, J-HS H

Recent results on higher moments of net-baryon distributions in Pb-Pb collisions from ALICE — •Mesut Arslandok for the ALICE collaboration — Physikalisches Institut Heidelberg

The fluctuations of conserved charges in ultrarelativistic heavy-ion collisions provide insights into the properties QCD phase diagram. At LHC energies there would be, for vanishing light quark masses, a temperature-driven genuine phase transition of second order between the hadron gas and the quark-gluon plasma. For realistic quark masses, however, this transition becomes a smooth cross over. Nevertheless, due to the small masses of current quarks one can still probe critical phenomena at the LHC energies, which can be confronted with the ab-initio LQCD calculations at vanishing baryon chemical potential.

In this contribution, the latest results will be presented on event-by-event analysis of net-baryon number fluctuation measurements in Pb-Pb collisions recorded by the ALICE Collaboration at the CERN LHC. The cumulants of net-proton distributions, as proxy to net-baryon distributions, up to third order will be discussed. The experimental results are confronted with corresponding signals from dynamical models and the dependence of fluctuation measurements on phase-space coverage of detected particles are addressed in view of the calculations from Lattice QCD (LQCD) and the Hadron Resonance Gas (HRG) model. Moreover, contributions from non-dynamical fluctuations such as those stemming from the baryon number conservation will be addressed.
Supported by BMBF and SFB 1225 ISOQUANT.