Speaker
Description
Heavy quarks are predominantly produced in the initial hard scatterings of relativistic heavy-ion collisions and therefore have direct access to the early stages of the collision event. We study the sensitivity of open heavy-flavor observables to the pre-equilibrium stage of the medium evolution in Pb+Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV. The space-time evolution of the bulk medium is modeled using the IP-Glasma+MUSIC+UrQMD framework, which provides a realistic description from the earliest times through the hadronic phase. Charm quarks are initialized using PYTHIA and their in-medium propagation is simulated via Langevin dynamics implemented within the MARTINI framework [1]. While substantial momentum broadening of charm quarks is observed during the earliest stages of the collision, we find that the resulting D-meson $R_{AA}$, $v_2$ and angular correlations exhibit only a weak sensitivity to pre-equilibrium interactions. Our results suggest that the late-time medium effects dominate the observed heavy-flavor suppression and anisotropic flow. We review the elements that lead us to this conclusion.
- M. Singh, M. Kurian, B. Schenke, S. Jeon, and C. Gale, arXiv:2509.18647
| Is this an experimental talk? | No |
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| Is this on behalf of a collaboration? | No |
| Are you willing to present as a poster if it is not selected for oral presentation? | Yes |