Studies of charm quark diffusion inside jets using Pb-Pb and &lt;em&gt;pp &lt;/em&gt;collisions at √&lt;em&gt;s&lt;/em&gt;&lt;sub&gt;NN&lt;/sub&gt; = 5.02  TeV

Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Dragicevic, M.; Erö, J.; Escalante Del Valle, A.; Caminada, L.; Deiters, K.; Erdmann, W.; Horisberger, R.; Ingram, Q.; Kaestli, H.C.; Kotlinski, D.; Langenegger, U.; Rohe, T.; Wiederkehr, S.A.; Woods, N.

doi:10.1103/PhysRevLett.125.102001

Studies of charm quark diffusion inside jets using Pb-Pb and pp collisions at √s_NN = 5.02 TeV

Sirunyan AM, Tumasyan A, Adam W, Ambrogi F, Asilar E, Bergauer T, Brandstetter J, Dragicevic M, Erö J, Escalante Del Valle A, Caminada L, Deiters K, Erdmann W, Horisberger R, Ingram Q, Kaestli HC, Kotlinski D, Langenegger U, Rohe T, Wiederkehr SA, Woods N, et al.

Citation

Sirunyan, A. M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., … Woods, N. (2020). Studies of charm quark diffusion inside jets using Pb-Pb and pp collisions at √s_NN = 5.02 TeV. Physical Review Letters, 125(10), 102001 (18 pp.). https://doi.org/10.1103/PhysRevLett.125.102001

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:34530

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^jet_T > 60 GeV/c and D⁰ mesons with p^D_T > 4 GeV/c in lead-lead (Pb-Pb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of √s_NN = 5.02 TeV, recorded by the CMS detector at the LHC. The radial distribution of D⁰ 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 Pb-Pb 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 Pb-Pb collisions, compared to the pp results, the D⁰ meson distribution for 4 < p^D_T < 20 GeV/c 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^D_T, the Pb-Pb and pp radial distributions are found to be similar.