Speakers
Description
Two-particle transverse momentum correlation functions are a powerful technique for understanding the dynamics of relativistic heavy-ion collisions. Among these, the transverse momentum correlator $G_{2}\left(\Delta\eta,\Delta\varphi\right)$ is of particular interest for its potential sensitivity to the shear viscosity per unit of entropy density $\eta/s$ of the quark-gluon plasma formed in heavy-ion collisions [1,2]. We used the UrQMD, AMPT, and EPOS models at $\sqrt{s_{_{NN}}}$ 2760 and 200 GeV to investigate: the longitudinal broadening as well as the long range azimuthal dependence of the $G_{2}\left(\Delta\eta,\Delta\varphi\right)$ correlator. We will present the centrality, $\eta/s$, and the event shape dependence of the longitudinal width $\sigma\left( \Delta\eta \right)$ and the azimuthal harmonics $a^{p_T}_{n}$ of the $G_{2}\left(\Delta\eta,\Delta\varphi\right)$ correlator [3]. Our calculations showed that $G_{2}\left(\Delta\eta,\Delta\varphi\right)$ correlator can differentiate between theoretical models and constrain the determination of $\eta/s$.
[1] S. Gavin and M. Abdel-Aziz, Phys. Rev. Lett. 97, 162302 (2006)
[2] V. Gonzalez, et al., (2020), Eur.Phys.J.C 81 (2021) 5, 465
[3] Niseem Magdy, et al., arXiv:2105.07912
| Preferred track | Collectivity & Multiple Scattering |
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