Speaker
Description
Given their large mass, charm quarks are recognised as powerful probes of the colour-deconfined state of the matter called quark–gluon plasma (QGP) created in high-energy heavy–ion collisions. They are mainly pro- duced in high-momentum transfer processes in shorter timescales compared to the QGP formation time, and they subsequently experience the full sys- tem evolution interacting with the medium constituents via elastic scatter- ings and radiative processes.
The comparison of measurements of charm-hadron production and an- gular anisotropies with phenomenological model calculations provides im- portant constraints to the charm-quark diffusion coefficient Ds in the QGP. However, the experimental observables are modified by additional effects, such as the modification of the charm-quark hadronisation in presence of a deconfined medium and the rescattering in the hadronic phase. Hence, the- oretical models based on the charm-quark transport in a hydrodynamically expanding QGP requires to properly model also the in-medium hadronisa- tion and the participation to the hadronic phase.
In this contribution, the most recent estimate of the Ds transport coeffi- cient will be presented. Moreover, the studies of charm-quark hadronisation, via the measurement of charm baryon and charm-strange meson production from pp to Pb–Pb collisions will be shown. Finally, the measurement of scat- tering parameters governing the residual strong interaction between charm hadrons and light hadrons via the femtoscopy technique in pp collisions, crucial to constrain the effect of the hadronic rescattering in heavy–ion col- lisions, will be discussed.
