Strange hadron production in Au+Au collisions at √sNN=7.7, 11.5, 19.6, 27, and 39 GeV

• Verfasst von: Adam, Jaroslav [VerfasserIn]
• Verfasst von: Deppner, Ingo Martin [VerfasserIn]
• Verfasst von: Herrmann, Norbert [VerfasserIn]
• Titel: Strange hadron production in Au+Au collisions at √sNN=7.7, 11.5, 19.6, 27, and 39 GeV
• Körperschaft: STAR Collaboration [VerfasserIn]
• Verf.angabe: J. Adam, I.M. Deppner, N. Herrmann [und 349 weitere] (STAR Collaboration)
• E-Jahr: 2020
• Jahr: 29 September 2020
• Umfang: 25 S.
• Fussnoten: Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol, "NN" ist dabei tiefgestellt ; Gesehen am 21.01.2021
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2020
• Band/Heft Quelle: 102(2020,3) Artikel-Nummer 034909, 25 Seiten
• ISSN Quelle: 2469-9993
• DOI: doi:10.1103/PhysRevC.102.034909
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1745158235

Abstract

We present STAR measurements of strange hadron (K0S, Λ, ¯¯¯Λ, Ξ−, ¯¯¯Ξ+, Ω−, ¯¯¯Ω+, and ϕ) production at midrapidity (|y|<0.5) in Au+Au collisions at √sNN = 7.7–39 GeV from the Beam Energy Scan Program at the Relativistic Heavy Ion Collider (RHIC). Transverse-momentum spectra, averaged transverse mass, and the overall integrated yields of these strange hadrons are presented versus the centrality and collision energy. Antibaryon-to-baryon ratios (¯¯¯Λ/Λ, ¯¯¯Ξ+/Ξ−, ¯¯¯Ω+/Ω−) are presented as well and used to test a thermal statistical model and to extract the temperature normalized strangeness and baryon chemical potentials at hadronic freeze-out (μB/Tch and μS/Tch) in central collisions. Strange baryon-to-pion ratios are compared to various model predictions in central collisions for all energies. The nuclear modification factors (RCP) and antibaryon-to-meson ratios as a function of transverse momentum are presented for all collision energies. The K0S RCP shows no suppression for pT up to 3.5 GeV/c at energies of 7.7 and 11.5 GeV. The ¯¯¯Λ/K0S ratio also shows baryon-to-meson enhancement at intermediate pT (≈2.5 GeV/c) in central collisions at energies above 19.6 GeV. Both observations suggest that there is likely a change of the underlying strange quark dynamics at collision energies below 19.6 GeV.