Studies of charm quark diffusion inside jets using PbPb and pp collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV

Abstract

The first study of charm quark diffusion with respect to the jet axis in heavy ion collisions is presented. The measurement is performed using jets with $p_{\mathrm{T}}^{\mathrm{jet}}$ $>$ 60 GeV and D${}^0$ mesons with $p_{\mathrm{T}}^{\mathrm{D}}$ $>$ 4 GeV in lead-lead (PbPb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV, recorded by the CMS detector at the LHC. The radial distribution of D${}^0$ mesons with respect to the jet axis is sensitive to the production mechanisms of the meson, as well as to the energy loss and diffusion processes undergone by its parent parton inside the strongly interacting medium produced in PbPb collisions. When compared to Monte Carlo event generators, the radial distribution in pp collisions is found to be well-described by PYTHIA, while the slope of the distribution predicted by SHERPA is steeper than that of the data. In PbPb collisions, compared to the pp results, the D${}^0$ meson distribution for 4 $<$ $p_{\mathrm{T}}^{\mathrm{D}}$ $<$ 20 GeV hints at a larger distance on average with respect to the jet axis, reflecting a diffusion of charm quarks in the medium created in heavy ion collisions. At higher $p_{\mathrm{T}}^{\mathrm{D}}$, the PbPb and pp radial distributions are found to be similar.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-18-007 (CMS Public Pages)

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• Radial profile of bottom quarks in jets in high-energy nuclear collisions
• Heavy-Flavour Jets in High-Energy Nuclear Collisions
• Probing the in-medium $P_T$-broadening by $\gamma$+HF angular de-correlations
• Longitudinal momentum fraction of heavy-flavor mesons in jets in high-energy nuclear collisions
• Radial distribution of charm quarks in jets in high-energy heavy-ion collisions
• Probing the mass effect of heavy quark jets in high-energy nuclear collisions
• Mass suppression effect in QCD radiation and hadron angular distribution in jet
• Review of results using heavy ion collisions at CMS
• Study of heavy-flavor jets in a transport approach