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HK: Fachverband Physik der Hadronen und Kerne
HK 32: Heavy-Ion Collisions and QCD Phases V
HK 32.3: Vortrag
Donnerstag, 19. März 2026, 14:30–14:45, PHIL C 601
Measurement of higher-order net-proton fluctuations with ALICE — •Ilya Fokin for the ALICE Germany collaboration — Physikalisches Institut, Universität Heidelberg
Fluctuations of conserved charges, such as the baryon number, are a unique tool to study the phase diagram of strongly interacting matter. Cumulants of distributions of conserved charges in heavy-ion collisions can be related to the equation of state in lattice QCD (LQCD) and thus make the calculations from first principle accessible in the experiment. Starting from the fourth-order, these calculations predict a significant difference between the baryon number susceptibilities using the full QCD partition function on the lattice and a hadron resonance gas model.
For a quantitative comparison, correlations from local baryon number conservations must be considered in the theoretical baseline and additional contributions from volume fluctuations must be quantified.
In this contribution, measurements of the higher-order cumulants of the net-proton number up to fourth order in Pb–Pb collisions at √sNN=5.02 TeV with the ALICE detector at the LHC are presented as a function of the pseudorapidity acceptance and centrality.
Keywords: ALICE; fluctuations; net-proton