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Measurements of Chemical Potentials in Pb-Pb Collisions at βˆšπ‘ NN=5.02  TeV

Publication Type
Journal
Journal Name
Physical Review Letters
Publication Date
Volume
133
Issue
9
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Abstract

This Letter presents the most precise measurement to date of the matter-antimatter imbalance at midrapidity in Pb-Pb collisions at a center-of-mass energy per nucleon pair βˆšπ‘ NN=5.02  TeV. Using the Statistical Hadronization framework, it is possible to obtain the value of the electric charge and baryon chemical potentials, πœ‡π‘„=βˆ’0.18Β±0.90  MeV and πœ‡π΅=0.71Β±0.45  MeV, with unprecedented precision. A centrality-differential study of the antiparticle-to-particle yield ratios of charged pions, protons, Ξ© baryons, and light (hyper)nuclei is performed. These results indicate that the system created in Pb-Pb collisions at the LHC is on average baryon-free and electrically neutral at midrapidity.