Abstract
The RHIC Beam Energy Scan (BES) program was proposed to study the QCD phase transition. As a sensitive probe to the transition from the hadron gas to the Quark-Gluon Plasma, the particle ratios of strange hadrons are measured to study the properties of nuclear matter. Recently, the production of strange hadrons (KS0, Λ, Ξ, Ω, and ϕ) at mid-rapidity (|y|<0.5) in Au+Au collisions at √SNN = 54.4 GeV were measured by the STAR experiment at RHIC. In this paper nuclear modification factor, baryon-to-meson ratio, as well as the overall integrated yields of these strange hadrons at √SNN = 54.4 GeV are presented. In particular, the multi-strange baryon-to-meson ratio N(Ω− + Ω¯+)/[2N(ϕ)] is studied and compared to previous measurements from other BES energies. The strange-hadron-to-pion ratios versus charged hadron multiplicity are also studied and compared to the measurements in heavy-ion collisions at higher energies.
Highlights
The main goal of the RHIC Beam Energy Scan (BES) Program is to map the quantum chromodynamics (QCD)phase diagram, including locating the onset of deconfinement, searching the critical point and the phase boundary of the first order phase transition [1]
The central-to-peripheral nuclear modification factor Rcp is less than unity at high pT for various particles at top RHIC
More details of the strange particle reconstruction can be found in Ref. [7]
Summary
The main goal of the RHIC BES Program is to map the quantum chromodynamics (QCD). phase diagram, including locating the onset of deconfinement, searching the critical point and the phase boundary of the first order phase transition [1]. The enhancement of Ω/φ ratio at intermediate pT indicates hadron formation through parton recombination [8], the study of Ω and φ particles offers the knowledge of the transition from partonic to hadronic matter. The Solenoidal Tracker At RHIC (STAR) is a multi-purpose detector at the RHIC collider at Brookhaven National Laboratory. It provides measurements with full azimuthal coverage, uniform acceptance and excellent particle identification capability [9, 10]. This work presents strangeness production in Au+Au collisions at sNN = 54.4 GeV, collected by the STAR experiment during the first phase of RHIC BES program in 2017.
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