Measurements of dielectron production in Au + Au collisions at √sNN = 27,39, and 62.4 GeV from the STAR experiment
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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| Hauptverfasser: | , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
1 June 2023
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| In: |
Physical review
Year: 2023, Jahrgang: 107, Heft: 6, Pages: 1-7 |
| ISSN: | 2469-9993 |
| DOI: | 10.1103/PhysRevC.107.L061901 |
| Online-Zugang: | 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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| Verfasserangaben: | 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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| 245 | 1 | 0 | |a Measurements of dielectron production in Au + Au collisions at √sNN = 27,39, and 62.4 GeV from the STAR experiment |c 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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| 246 | 3 | 3 | |a Measurements of dielectron production in Au + Au collisions at square root sNN = 27,39, and 62.4 GeV from the STAR experiment |
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| 520 | |a 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. | ||
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