Abstract
In these proceedings, an overview of recent STAR results on selected topics is presented. These results utilize Au+Au collisions at various energies, and are aimed at understanding the properties of QED and QCD, characterizing the quark-gluon plasma, as well as searching for the possible critical point in the QCD phase diagram. Specifically, following measurements are discussed: global hyperon polarization, net-proton fluctuations, low transverse momentum dimuon pair production, hyperon-baryon correlations, and f0(980) elliptic flow.
Highlights
13 The Quark-Gluon Plasma (QGP), consisting of deconfined quarks and gluons, can be cre-14 ated through a phase transition from ordinary nuclear matter in which quarks and gluons are 15 confined within hadrons
Ated through a phase transition from ordinary nuclear matter in which quarks and gluons are confined within hadrons. This transition is realized at the Relativistic Heavy Ion Collider
The correlation between 107 Ξ − Ξ pairs is studied in 0-80% 200 GeV Au+Au collisions, and the result is shown in the 108 right panel of Fig. 6
Summary
13 The Quark-Gluon Plasma (QGP), consisting of deconfined quarks and gluons, can be cre-. In 2017, a new phenomenon of global polarization for both Λ and anti-Λ hyperons, shown as open and filled circles in the left panel of Fig. 1, was discovered in mid-central Au+Au collisions [2]. The correlation between Ξ − Ξ pairs is studied in 0-80% 200 GeV Au+Au collisions, and the result is shown in the 108 right panel of Fig. 6. In Au+Au collisions at RHIC, particle’s elliptic flow (v2) is seen to empirically follow the number of constituent quark (NCQ, nq) scaling, i.e. v2/nq collapses to a common curve for different particles when plotted against (mT − m0)/nq, where mT = m20 + p2T and m0 is the particle’s rest mass This is because v2 is mainly developed during the partonic phase before hadronization. Additional data taking of 200 GeV Au+Au collisions planned for 2023 and 2025 will be beneficial in reducing 124 uncertainties of this measurement
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