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Measurements of chemical potentials in Pb-Pb collisions at sqrt{s_(rm NN)} = 5.02 TeV

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arxiv 2311.13332 v3 pith:TFOETHL6 submitted 2023-11-22 nucl-ex hep-ex

Measurements of chemical potentials in Pb-Pb collisions at sqrt{s_(rm NN)} = 5.02 TeV

classification nucl-ex hep-ex
keywords collisionspb-pbchemicalmidrapiditypotentialssqrtantiparticle-to-particleaverage
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 $\sqrt{s_{\rm NN}} = 5.02$ TeV. Using the Statistical Hadronization framework, it is possible to obtain the value of the electric charge and baryon chemical potentials, $\mu_Q=-0.18\pm0.90$ MeV and $\mu_B=0.71\pm0.45$ MeV, with unprecedented precision. A centrality-differential study of the antiparticle-to-particle yield ratios of charged pions, protons, $\Omega$-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.

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