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

Summary, in English

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 CERN.

• Author: S. Acharya; S. Basu; P. Christiansen; J. Hansen; K.E. Iversen; O. Matonoha; R. Nepeivoda; A. Ohlson; D. Silvermyr; J. Staa; V. Vislavicius; N. Zurlo
• Department/s: Particle and nuclear physics; eSSENCE: The e-Science Collaboration
• Publishing year: 2024
• Language: English
• Publication/Series: Physical Review Letters
• Volume: 133
• Issue: 9
• Links: http://dx.doi.org/10.1103/PhysRevLett.133.092301
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Subatomic Physics
• Keywords: Colliding beam accelerators; Germanium compounds; Negative ions; Photons; Positive ions; Tellurium compounds; A-center; Baryon chemical potential; Center-of-mass energies; Centre-of-mass energies; Hadronization; Measurements of; Mid-rapidity; Pb-Pb collisions; Precise measurements; Yields ratio; article; electric potential; Lead alloys
• Status: Published
• ISBN/ISSN/Other: ISSN: 0031-9007