Paper Title :   pt Correlations in Au + Au Collisions in the High Baryon Density Region

  Target Journal : PRL

  PAs : Rene Bellwied, Rutik Manikandhan, Caleb Broodo, Aranya Giri, Chun-Jian Zhang

  PA representative :  Rutik Manikandhan

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 Abstract:

  We present two-particle pt correlations as a function of event centrality for Au+Au collisions from the STAR-FXT program at √sN N = 3.0, 3.2, 3.5, 3.9, 4.5 and 7.7 GeV. The results are compared to previous measurements from STAR BES-I, CERES at the Super Proton Synchrotron and ALICE at the Large Hadron Collider. The data are compared with UrQMD and AMPT model calculations and with a model based on a Boltzmann-Langevin approach incorporating effects from thermalization. In central collisions, the (pT ) correlations show a decrease as a function of collision energy from √sN N = 3.0 GeV to 4.5 GeV and then an increase from √sN N = 7.7 GeV to 200 GeV. By further investigating this non-monotonous behaviour, we aim to deepen our understanding of how the system evolves across different energy regimes, and whether this non-monotonicity could signal the possible existence of a QCD critical point.

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 Paper Figures:

  Fig. 1 : The two particle $p_{T}$ correlator as a function of collisions energy $sqrt{s_{NN}}$ in Au+Au 0-5% central collisions. Statistical and systematic uncertainties are shown as bars and gray bands, respectively. Note that for all the measurements the charged particles are selected within a $p_{T}$ acceptance of [0.2,2.0] GeV/c and pseudorapidity ($\eta$) acceptance of $|\eta_{cm}|$ < 0.5, where  \eta_{cm} = \eta_{lab} - \eta_{mid}.