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Studies of Charm Quark Diffusion inside Jets Using Pb-Pb and pp Collisions at √sNN=5.02  TeV

CMS Collaboration; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Dragicevic, M.; Erö, J.; Escalante Del Valle, A.; Flechl, M.; Frühwirth, R.; Ghete, V. M.; Hrubec, J.; Jeitler, M.; Krammer, N.; Krätschmer, I.; Liko, D.; Madlener, T.; Mikulec, I.; ... mehr

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 pjet¦T>60  GeV/c and D$^{0}$ mesons with pD¦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 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 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 D$^{0}$ meson distribution for 4<pD¦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 pD¦T, the Pb-Pb and pp radial distributions are found to be similar.

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Verlagsausgabe §
DOI: 10.5445/IR/1000124734
Veröffentlicht am 12.11.2020
DOI: 10.1103/PhysRevLett.125.102001
Zitationen: 3
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Computational Materials Science (IAM-CMS)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Kernphysik (IKP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Institut für Telematik (TM)
Steinbuch Centre for Computing (SCC)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 04.09.2020
Sprache Englisch
Identifikator ISSN: 0031-9007, 1079-7114
KITopen-ID: 1000124734
HGF-Programm 51.03.03 (POF III, LK 01) Kosmische Strahlung Auger
Erschienen in Physical review letters
Verlag American Physical Society (APS)
Band 125
Heft 10
Seiten Art-Nr. 102001
Vorab online veröffentlicht am 03.09.2020
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