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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F23%3A00575514" target="_blank" >RIV/61389005:_____/23:00575514 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevC.107.L061901" target="_blank" >https://doi.org/10.1103/PhysRevC.107.L061901</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevC.107.L061901" target="_blank" >10.1103/PhysRevC.107.L061901</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

We report systematic measurements of dielectron (e+e-) invariant-mass Mee spectra at midrapidity in Au + Au collisions at root 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 p-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 < 0.75 GeV/c2, normalized by the charged particle multiplicity at midrapidity, are compared with previously published measurements for Au + Au at sNN = 19.6 and 200 GeV. Models that include an in-medium broadening of the p-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.

Název v anglickém jazyce

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

Popis výsledku anglicky

We report systematic measurements of dielectron (e+e-) invariant-mass Mee spectra at midrapidity in Au + Au collisions at root 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 p-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 < 0.75 GeV/c2, normalized by the charged particle multiplicity at midrapidity, are compared with previously published measurements for Au + Au at sNN = 19.6 and 200 GeV. Models that include an in-medium broadening of the p-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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review C

ISSN

2469-9985

e-ISSN

2469-9993

Svazek periodika

107

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

L061901

Kód UT WoS článku

001023717500001

EID výsledku v databázi Scopus

2-s2.0-85162228817