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.

Acharya, S., Adamová, D., Aglieri Rinella, G., Aglietta, L., Agnello, M., Agrawal, N., et al. (2024). Measurements of Chemical Potentials in Pb-Pb Collisions at √sNN = 5.02 TeV. PHYSICAL REVIEW LETTERS, 133(9), 1-15 [10.1103/physrevlett.133.092301].

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

Alici, A.;Arcelli, S.;Bellini, F.;Carnesecchi, F.;Colocci, M.;Ercolessi, F.;Jacazio, N.;Malfattore, G.;Rubini, N.;Scioli, G.;Strazzi, 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.
2024
Acharya, S., Adamová, D., Aglieri Rinella, G., Aglietta, L., Agnello, M., Agrawal, N., et al. (2024). Measurements of Chemical Potentials in Pb-Pb Collisions at √sNN = 5.02 TeV. PHYSICAL REVIEW LETTERS, 133(9), 1-15 [10.1103/physrevlett.133.092301].
Acharya, S.; Adamová, D.; Aglieri Rinella, G.; Aglietta, L.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahn, S.  U.; Ahuja, I.; Akindinov, A.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1001503
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