Gießen 2024 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Heavy-Ion Collisions and QCD Phases VII

HK 33.4: Talk

Tuesday, March 12, 2024, 18:30–18:45, HBR 62: EG 05

Measurement of Net-Proton Fluctuations in Pb-Pb Collisions with ALICE — •Ilya Fokin for the ALICE Germany collaboration — Physikalisches Institut, 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. Recent results from LQCD suggest that in strong magnetic fields, fluctuations of the baryon number might be increased.

In this talk, measurements of the second-order cumulant of the (anti-)proton and net-proton number in Pb--Pb collisions with the ALICE detector at the LHC are presented. The moments of the net-proton number, which are used as a proxy for the baryon number, are calculated using the Identity Method to avoid the problem of misidentification. The new results cover a larger momentum acceptance and the centrality range than previous ALICE measurements of net-proton fluctuations.

Keywords: Fluctuations; ALICE; PbPb