Recent results from STAR experiment in Au+Au collisions at $\sqrt{s_{NN}}$ = 9.2 GeV

TL;DR

This paper reports on the STAR experiment's initial results from Au+Au collisions at 9.2 GeV, exploring the QCD phase diagram and the properties of quark-gluon plasma through particle spectra, ratios, and anisotropy measurements.

Contribution

First experimental results from STAR at 9.2 GeV providing insights into QCD phase transition signals and comparing with SPS and higher-energy RHIC data.

Findings

Particle spectra and ratios at 9.2 GeV are consistent with previous measurements.

Azimuthal anisotropy parameters show signs of collective flow.

Results contribute to understanding the QCD phase diagram near the critical point.

Abstract

Theoretical models suggest that the Quantum Chromo-Dynamics (QCD) phase diagram has a critical point demarcating the order of transition between the two phases: the hadron gas, in which the quarks are confined and the Quark-Gluon Plasma (QGP). The central goal of the experiments with relativistic heavy-ion collisions is to create and study such form of matter called the QGP and understand the QCD phase diagram. The STAR (Solenoidal Tracker At RHIC) detector is pertinent for the RHIC (Relativistic Heavy Ion Collider) energy scan program where we plan to explore this exciting physics possibility using heavy-ion collisions at various center of mass energies. A first test run with Au+Au collisions at $\sqrt{s_{NN}}$ = 9.2 GeV took place in early 2008. We present the recent STAR results from this run of the identified particles (pion, kaon and proton) transverse momentum spectra and ratios. Also we shall present and discuss the results of the azimuthal anisotropy parameters ($v_{1}$, $v_{2}$) along with the pion interferometry measurements. These recent results from Au+Au collisions at $\sqrt{s_{NN}}$ = 9.2 GeV are compared with other SPS and RHIC measurements.