Speaker
Description
With the extreme temperatures and energy densities generated by ultra-relativistic heavy-ion collisions, a new state of matter with surprising fluid properties will be created. Non-central heavy-ion collisions can generate a large initial angular momentum, resulting a strong vortical of $\omega \approx (9 \pm 1)× 10^{-21} s^{−1}$ in the fluid, estimated from the global $\Lambda$ hyperon polarization measurements in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. This vortical structure may change the azimuthal distribution of the particle produced in the fluid.
We study the directed flow ($v_{1}$) of charm hadrons and light flavor hadrons in relativistic heavy-ion collisions based on a multiphase transport model (AMPT) framework with an initial vortical pattern in the partonic interaction phase. We find that the $dv_{1}/dy$ as a function of rapidity for pion and kaon are reversed compared to the default AMPT setting and are comparable to the measured value at RHIC energy. And the $dv_{1}/dy$ slope of $D^0$ meson increased by more than 2 times with the vorticity and also compared to the $D^0$ $v_{1}$ measurements from RHIC.
| Category | Theory |
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