Measurements of dielectron production in Au + Au collisions at √sNN = 27,39, and 62.4 GeV from the STAR experiment

• Titel: Measurements of dielectron production in Au + Au collisions at √sNN = 27,39, and 62.4 GeV from the STAR experiment
• Mitwirkende: Abdulhamid, Muhammad Ibrahim [VerfasserIn]
• Mitwirkende: Aboona, Bassam [VerfasserIn]
• Mitwirkende: Adamczyk, Leszek [VerfasserIn]
• Mitwirkende: Butterworth, Jonathan [VerfasserIn]
• Mitwirkende: Deppner, Ingo Martin [VerfasserIn]
• Mitwirkende: Herrmann, Norbert [VerfasserIn]
• Mitwirkende: Kisel, Ivan [VerfasserIn]
• Mitwirkende: Leung, Yue [VerfasserIn]
• Mitwirkende: Söhngen, Yannick [VerfasserIn]
• Mitwirkende: Weidenkaff, Philipp [VerfasserIn]
• Mitwirkende: Zyzak, Maksym [VerfasserIn]
• Körperschaft: STAR Collaboration [VerfasserIn]
• Verf.angabe: M.I. Abdulhamid, B.E. Aboona, J. Adam, L. Adamczyk, J. Butterworth, I.M. Deppner, N. Herrmann, I. Kisel, Y. Söhngen, P.C. Weidenkaff, M. Zyzak (STAR Collaboration) ... [und 368 weitere]
• E-Jahr: 2023
• Jahr: 1 June 2023
• Umfang: 7 S.
• Fussnoten: Gesehen am 26.02.2024 ; Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, NN ist dabei tiefgestellt
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2023
• Band/Heft Quelle: 107(2023), 6, Artikel-ID L061901, Seite 1-7
• ISSN Quelle: 2469-9993
• DOI: doi:10.1103/PhysRevC.107.L061901
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1881612074

Abstract

We report systematic measurements of dielectron (e+e−) invariant-mass Mee spectra at midrapidity in Au+Au collisions at √sNN = 27, 39, and 62.4 GeV taken with the STAR detector at the Relativistic Heavy Ion Collider. For all energies studied, a significant excess yield of dielectrons is observed in the low-mass region (0.40<Mee<0.75 MeV/c2) compared to hadronic cocktail simulations at freeze-out. Models that include an in-medium broadening of the ρ-meson spectral function consistently describe the observed excess. In addition, we report acceptance-corrected dielectron-excess spectra for Au+Au collisions at midrapidity (|yee|< 1) in the 0-80% centrality bin for each collision energy. The integrated excess yields for 0.4<Mee<0.75GeV/c2, normalized by the charged particle multiplicity at midrapidity, are compared with previously published measurements for Au+Au at √sNN1 = 19.6 and 200 GeV. Models that include an in-medium broadening of the ρ-meson spectral function consistently describe the observed excess. The normalized excess yields in the low-mass region show no significant collision energy dependence. The data, however, are consistent with model calculations that demonstrate a modest energy dependence.