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

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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...

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Main Authors: Abdulhamid, Muhammad Ibrahim (Author) , Aboona, Bassam (Author) , Adamczyk, Leszek (Author) , Butterworth, Jonathan (Author) , Deppner, Ingo Martin (Author) , Herrmann, Norbert (Author) , Kisel, Ivan (Author) , Leung, Yue (Author) , Söhngen, Yannick (Author) , Weidenkaff, Philipp (Author) , Zyzak, Maksym (Author)
Corporate Author: STAR Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 1 June 2023
In: Physical review
Year: 2023, Volume: 107, Issue: 6, Pages: 1-7
ISSN:2469-9993
DOI:10.1103/PhysRevC.107.L061901
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevC.107.L061901
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevC.107.L061901
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Author Notes: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]
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Summary: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.
Item Description:Gesehen am 26.02.2024
Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, NN ist dabei tiefgestellt
Physical Description:Online Resource
ISSN:2469-9993
DOI:10.1103/PhysRevC.107.L061901

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