Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 42: Heavy-Ion Collisions and QCD Phases VII

HK 42.4: Vortrag

Donnerstag, 13. März 2025, 15:00–15:15, HS 3 Chemie

Measurement of Net-Proton Fluctuations with ALICE — •Ilya Fokin for the ALICE Germany collaboration — Physikalisches Institut, Universität Heidelberg

Lattice QCD (LQCD) calculations predict that chiral symmetry is restored in a smooth crossover transition between a quark-gluon plasma and a hadron resonance gas (HRG) at vanishing net-baryon density, a condition realized in heavy-ion collisions at the LHC. In this regime, the net-baryon number cumulants computed using the HRG and LQCD partition functions are in good agreement up to third order. However, starting with the fourth-order cumulants, the LQCD results are significantly lower than the corresponding HRG results. This offers a unique opportunity to experimentally verify the full QCD partition function by measuring the fourth-order cumulants of the net-proton number distributions.

In this talk, the status of the measurement of net-proton cumulants up to fourth order in Pb--Pb collisions with ALICE is presented.

Keywords: ALICE; Fluctuations