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Adam, J.; Adams, J. R.; Adkins, J. K.; Aggarwal, I.; Ahammed, Z.; Anderson, D. M.; Bellwied, R.; Bielcik, J.; Bielcikova, J.; Chakaberia, I.; Chan, B. K.; Chang, F-H; Chang, Z.; Chen, Z.; Choudhury, S.; Chu, X.; Di Carlo, L.; Fatemi, R.; Fazio, S.; Geurts, F.; Guryn, W.; Harris, J. W.; He, W.; Heppelmann, S.; Hoffman, E.; Holub, L.; Huang, Y.; Kabir, M. L.; Kagamaster, S.; Kalinkin, D.; Kauder, K.; Ke, H. W.; Korobitsin, A.; Kramarik, L.; Kunnawalkam Elayavalli, R.; Landgraf, J. M.; Lednicky, R.; Lewis, N.; Liang, X.; Licenik, R.; Lin, T.; Lisa, M. A.; Liu, F.; Liu, P.; Llope, W. J.; Longacre, R. S.; Loyd, E.; Mallick, D.; Matis, H. S.; Minaev, N. G.; Mioduszewski, S.; Nam, J. D.; Nasim, Md; Nayak, K.; Nishitani, R.; Nogach, L. V.; Nunes, A. S.; Oldag, E. W.; Oh, S.; Page, B. S.; Pandav, A.; Panebratsev, Y.; Perkins, C.; Pluta, J.; Porter, J.; Prozorova, V.; Qiu, H.; Ritter, H. G.; Robotkova, M.; Romero, J. L.; Seger, J.; Seyboth, P.; Sikora, R.; Singha, S.; Sinha, P.; Stanislaus, T. S.; Stringfellow, B.; Sun, X.; Tang, Z.; Todoroki, T.; Tomkiel, C. A.; Tripathy, S. K.; Trzeciak, B. A.; Tsai, O. D.; Underwood, D. G.; Vasiliev, A. N.; Vassiliev, I.; Videbæk, F.; Voloshin, S. A.; Weidenkaff, P. C.; Wissink, S. W.; Wu, J.; Xie, G.; Xie, W.; Xu, H.; Yang, Q.; Yip, K.; Zhang, C.; Zhang, J.; Zhao, M.
Physical review. C, 10/2022, Letnik: 106, Številka: 4Journal Article
Two-particle correlation measurements projected onto two-dimensional, transverse rapidity coordinates (yT1,yT2), allow access to dynamical properties of the QCD medium produced in relativistic heavy-ion collisions that angular correlation measurements are not sensitive to. Here, we report non-identified charged-particle correlations for Au + Au minimum-bias collisions at $\sqrt{s_{NN}}$ = 200 GeV taken by the STAR experiment at the Relativistic Heavy-Ion Collider (RHIC). Correlations are presented as 2D functions of transverse rapidity for like-sign, unlike-sign and all charged-particle pairs, as well as for particle pairs whose relative azimuthal angles lie on the near-side, the away-side, or at all relative azimuth. The correlations are constructed using charged particles with transverse momentum pT ≥ 0.15 GeV/c, pseudorapidity from –1 to 1, and azimuthal angles from –π to π. The significant correlation structures that are observed evolve smoothly with collision centrality. The major correlation features include a saddle shape plus a broad peak with maximum near yT ≈ 3, corresponding to pT ≈ 1.5 GeV/c. The broad peak is observed in both like- and unlike-sign charge combinations and in near- and away-side relative azimuthal angles. The all-charge, all-azimuth correlation measurements are compared with the theoretical predictions of HIJING and EPOS. The results indicate that the correlations for peripheral to mid-central collisions can be approximately described as a superposition of nucleon + nucleon collisions with minimal effects from the QCD medium. Strong medium effects are indicated in mid- to most-central collisions.
