Charm transport and hadronization in Pb-Pb collisions with ALICE by Stefano Trogolo (CERN)

by Stefano Trogolo (CERN)

Tuesday 15 Feb 2022, 16:00 → 18:00 Europe/Rome

via zoom (https://cern.zoom.us/j/61854784234?pwd=clhEMXhPSWFBd25tMmczOWJKU2hMQT09)

LHC seminar : https://indico.cern.ch/event/1127790/

In the ultra-relativistic heavy-ion collisions at the Large Hadron Collider (LHC), a state of matter, called quark-gluon plasma (QGP), is created. Measurements of the production of charm hadrons and leptons from c, b-hadron decays in nucleus--nucleus collisions are therefore useful to study the properties of the in-medium charm-quark energy loss via the comparison with theoretical calculations.

Models describing the heavy-flavour transport and energy loss in an hydrodynamically expanding medium require also a precise modelling of the heavy-quark hadronisation in heavy-ion collisions, which is investigated via the measurement of prompt charm mesons and baryons.

The measurements of the production and ratios of prompt D mesons, including D^{+}_{s}, and Λ^{+}_{c} baryons that use the 2018 Pb-Pb at √𝑠_{NN}=5.02 TeV data sample will be presented. The prompt D0 yield is reported down to 𝑝T=0 and charm hadron ratios are compared with results from pp collisions. In addition, the measurement of the azimuthal anisotropy of strange and non-strange D mesons is discussed. The second harmonic coefficient provides information about the degree of thermalisation of the charm quark in the medium, while the third one is sensitive to event-by-event fluctuations in the initial stage of the collision.

Finally, a systematic comparison of experimental measurements with model calculations will be discussed in order to disentangle different model contributions and provide important constraints to the charm-quark diffusion coefficient 𝐷𝑠 in the QGP.

LHC seminar : https://indico.cern.ch/event/1127790/

In the ultra-relativistic heavy-ion collisions at the Large Hadron Collider (LHC), a state of matter, called quark-gluon plasma (QGP), is created. Measurements of the production of charm hadrons and leptons from c, b-hadron decays in nucleus--nucleus collisions are therefore useful to study the properties of the in-medium charm-quark energy loss via the comparison with theoretical calculations.

Models describing the heavy-flavour transport and energy loss in an hydrodynamically expanding medium require also a precise modelling of the heavy-quark hadronisation in heavy-ion collisions, which is investigated via the measurement of prompt charm mesons and baryons.

The measurements of the production and ratios of prompt D mesons, including D^{+}_{s}, and Λ^{+}_{c} baryons that use the 2018 Pb-Pb at √𝑠_{NN}=5.02 TeV data sample will be presented. The prompt D0 yield is reported down to 𝑝T=0 and charm hadron ratios are compared with results from pp collisions. In addition, the measurement of the azimuthal anisotropy of strange and non-strange D mesons is discussed. The second harmonic coefficient provides information about the degree of thermalisation of the charm quark in the medium, while the third one is sensitive to event-by-event fluctuations in the initial stage of the collision.

Finally, a systematic comparison of experimental measurements with model calculations will be discussed in order to disentangle different model contributions and provide important constraints to the charm-quark diffusion coefficient 𝐷𝑠 in the QGP.