Adam, J. ; Galatyuk, Tetyana ; Seck, Florian
Hrsg.: STAR Collaboration (2018)
Low-pT e⁺e⁻ pair production in Au+Au collisions at √sNN = 200 GeV and U+U collisions at √sNN = 193 GeV at STAR.
In: Physical Review Letters, 121 (13)
doi: 10.1103/PhysRevLett.121.132301
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We report first measurements of e+e− pair production in the mass region 0.4<Mee<2.6 GeV/c2 at low transverse momentum (pT<0.15 GeV/c) in noncentral Au+Au collisions at √sNN=200 GeV and U+U collisions at √sNN=193 GeV. Significant enhancement factors, expressed as ratios of data over known hadronic contributions, are observed in the 40%–80% centrality of these collisions. The excess yields peak distinctly at low pT with a width (√⟨p2T⟩) between 40 and 60 MeV/c. The absolute cross section of the excess depends weakly on centrality, while those from a theoretical model calculation incorporating an in-medium broadened ρ spectral function and radiation from a quark gluon plasma or hadronic cocktail contributions increase dramatically with an increasing number of participant nucleons. Model calculations of photon-photon interactions generated by the initial projectile and target nuclei describe the observed excess yields but fail to reproduce the p2T distributions.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2018 |
| Autor(en): | Adam, J. ; Galatyuk, Tetyana ; Seck, Florian |
| Art des Eintrags: | Bibliographie |
| Titel: | Low-pT e⁺e⁻ pair production in Au+Au collisions at √sNN = 200 GeV and U+U collisions at √sNN = 193 GeV at STAR |
| Sprache: | Englisch |
| Publikationsjahr: | 25 September 2018 |
| Verlag: | APS Physics |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review Letters |
| Jahrgang/Volume einer Zeitschrift: | 121 |
| (Heft-)Nummer: | 13 |
| DOI: | 10.1103/PhysRevLett.121.132301 |
| URL / URN: | https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.12... |
| Kurzbeschreibung (Abstract): | We report first measurements of e+e− pair production in the mass region 0.4<Mee<2.6 GeV/c2 at low transverse momentum (pT<0.15 GeV/c) in noncentral Au+Au collisions at √sNN=200 GeV and U+U collisions at √sNN=193 GeV. Significant enhancement factors, expressed as ratios of data over known hadronic contributions, are observed in the 40%–80% centrality of these collisions. The excess yields peak distinctly at low pT with a width (√⟨p2T⟩) between 40 and 60 MeV/c. The absolute cross section of the excess depends weakly on centrality, while those from a theoretical model calculation incorporating an in-medium broadened ρ spectral function and radiation from a quark gluon plasma or hadronic cocktail contributions increase dramatically with an increasing number of participant nucleons. Model calculations of photon-photon interactions generated by the initial projectile and target nuclei describe the observed excess yields but fail to reproduce the p2T distributions. |
| Zusätzliche Informationen: | Art.No.: 132301 |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Experimentelle Kernphysik 05 Fachbereich Physik > Institut für Kernphysik > Experimentelle Kernphysik > Untersuchung von Quark-Materie mit virtuellen Photonen |
| Hinterlegungsdatum: | 09 Nov 2023 09:58 |
| Letzte Änderung: | 11 Dez 2023 10:42 |
| PPN: | 513964037 |
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