Speaker
Description
Understanding the initial conditions, the transport properties, and the dynamical evolution of the quark-gluon plasma are central objectives of the heavy-ion program at RHIC. The transverse momentum correlator $G_{2}\left(\Delta\eta,\Delta\varphi\right)$ has been shown to be sensitive to the shear viscosity $\eta/s$~[1,2]. On the other hand, the $\rho(v^{2}_{2},\langle p_{T} \rangle)$ correlator indicates more sensitivity to the initial-state than to final-state effects~[3,4]. A comprehensive set of $G_{2}\left(\Delta\eta,\Delta\varphi\right)$ and $\rho(v^{2}_{2},\langle p_{T} \rangle)$ measurements for Au+Au collisions spanning the beam energy range $\sqrt{s_{\rm NN}}$ = 11.5-200 GeV will be presented for several centralities and event shape selections. Furthermore, we also explore the initial-state effects in longitudinal directions using the de-correlation observables which measure the factorization ratio for flow harmonics, $r_{n}(\eta)(n = 2,3)$ and $R_{2}(\eta)$. The new results from isobar collisions as well as BES II energy Au+Au collisions will provide important insights on the 3D modeling of initial-state of heavy-ion collisions, especially its collision energy and collision size dependence. These results are also compared to LHC measurements and theoretical model calculations~[2,4] to provide constraints on initial-state fluctuations and $\eta/s(\mu_{B},T)$.
[1]~S. Gavin and M. Abdel-Aziz, Phys. Rev. Lett. 97, 162302 (2006)
[2]~N. Magdy et al., arXiv:2111.07406
[3]~P. Bozek, Phys. Rev. C 93, 044908 (2016).
[4]~N. Magdy et al., Phys. Lett. B 821 (2021) 136625
