Two-particle correlations in 2D pt space in Au+Au collisions at = 200 GeV at STAR

Workshop for Young Scientists on the Physics of Ultrarelativistic Nucleus–Nucleus Collisions 2012

Oldag, Elizabeth W.^1

Department of Physics, University of Texas at Austin, Austin, TX 78712, United States^1

关键词: Angular correlations;    Au+Au collisions;    Measurements of;    Relative azimuth angle;    Transverse momenta;    Two particle correlation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/446/1/012023/pdf
DOI  :  10.1088/1742-6596/446/1/012023

来源: IOP

【 摘 要 】

Measurements of 2D transverse momentum correlations on (pt1, Pt2) from minimum-bias Au+Au collisions at 200 GeV at STAR are presented and discussed. These correlations, formed from all charged particles with pt≥ 0.15 GeV/c, |η| ≤ 1, and 2π in azimuth, show a broad peak extending from pt=0.5-4.0 GeV/c. The broad peak is observed in both like- and unlike-sign charge combinations and for same- and away-side relative azimuth angles. Interestingly, the peak in the data for away-side or back-to-back pairs persists even in more-central collisions, remaining at approximately the same ptfor all centralities. These data are compared to theoretical models and the ptdependence of the same-side angular correlation structure.