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 sNN=5.02 TeV. Using the Statistical Hadronization framework, it is possible to obtain the value of the electric charge and baryon chemical potentials, μQ=-0.18+-0.90 MeV and μB=0.71+-0.45 MeV, with unprecedented precision. A centrality-differential study of the antiparticle-to-particle yield ratios of charged pions, protons, ω 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.

Measurements of Chemical Potentials in Pb-Pb Collisions at sNN=5.02  TeV / Acharya, S., Adamová, D., Aglieri Rinella, G., Aglietta, L., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S. u., Ahuja, I., Akindinov, A., Al-Turany, M., Aleksandrov, D., Alessandro, B., Alfanda, H. m., Alfaro Molina, R., Ali, B., Alici, A., Alizadehvandchali, N., Alkin, A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 133:9(2024), pp. 1-15. [10.1103/physrevlett.133.092301]

Measurements of Chemical Potentials in Pb-Pb Collisions at sNN=5.02  TeV

Agnello, M.;Balbino, A.;Bufalino, S.;Ciacco, M.;Ferrero, C.;Gioachin, G.;Politano', S.;
2024

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 sNN=5.02 TeV. Using the Statistical Hadronization framework, it is possible to obtain the value of the electric charge and baryon chemical potentials, μQ=-0.18+-0.90 MeV and μB=0.71+-0.45 MeV, with unprecedented precision. A centrality-differential study of the antiparticle-to-particle yield ratios of charged pions, protons, ω 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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Descrizione: Measurements of Chemical Potentials in Pb-Pb Collisions at \sqrt{s}_{NN}=5.02 TeV
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/3000897