Speaker
Description
The breaking of longitudinal boost invariance in non-central relativistic heavy ion collisions due to asymmetric local participant densities gives rise to a tilt in the reaction plane in the thermalized medium. A direct consequence of this is the observed rapidity odd directed flow of charged particles. We study the $v_1$ of $D$ and $\bar{D}$ mesons by evolving the charm quark phase space distribution within Langevin dynamics coupled to a hydrodynamic background. We demonstrate that the drag from the tilted fireball gives rise to directed flow of charm quarks that is $several$ $times$ $larger$ than that of the $v_1$ of observed charged particles[1]. The $v_1$ slope at mid-rapidity is sensitive to the magnitude of the tilt of the initial thermalized medium. Thus, its measurement will allow us to extract the tilt which also sets the scale of longitudinal correlation. Hence, rapidity odd heavy flavor $v_1$ is an ideal candidate to unravel the longitudinal profile of entropy deposition. We report on the comparison of the heavy flavor $v_1$ across beam energies as well as symmetric and asymmetric systems. Further, the electromagnetic fields of the initial stage can also give rise to rapidity odd $v_1$ but of opposite signs for $D$ and $\bar{D}$ mesons, unlike the tilt mechanism which provides same sign $v_1$ to both $D$ and $\bar{D}$. We study the interplay of the tilt and the electromagnetic fields on the $v_1$ of $D$ and $\bar{D}$ mesons.
[1]. S. Chatterjee and P. Bożek (2017), arXiv:1712.01189 [nucl-th]
| Content type | Theory |
|---|---|
| Centralised submission by Collaboration | Presenter name already specified |
