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Open-Charm Hadron Measurements in Au+Au Collisions at √sNN = 200 GeV by the STAR Experiment

Nuclear Physics Institute, Czech Academy of Sciences, 250 68 Řež, Czech Republic
This paper is based on the talk at the 18th Zimányi School, Budapest, Hungary, 3–7 December 2018.
Universe 2019, 5(9), 196; https://doi.org/10.3390/universe5090196
Received: 14 August 2019 / Revised: 3 September 2019 / Accepted: 5 September 2019 / Published: 7 September 2019
(This article belongs to the Special Issue The Zimányi School and Analytic Hydrodynamics in High Energy Physics)
Study of the open-charm hadron production in heavy-ion collisions is crucial for understanding the properties of the Quark-Gluon Plasma. In these papers, we report on a selection of recent STAR measurements of open-charm hadrons in Au+Au collisions at s NN = 200 GeV , using the Heavy-Flavor Tracker. In particular, the nuclear modification factors of D 0 and D ± mesons, elliptic and directed flow of D 0 mesons, D s /D 0 and Λ c / D 0 yield ratios are discussed. The observed suppression of D 0 and D ± mesons suggests strong interactions of the charm quarks with the QGP. The measured elliptic flow of D 0 mesons is large and follows the NCQ scaling, suggesting that charm quarks may be close to thermal equilibrium with the QGP medium. Both D s /D 0 and Λ c / D 0 yield ratios are found to be enhanced in Au+Au collisions. The enhancement can be explained by models incorporating coalescence hadronization of charm quarks. In addition, the directed flow of the D 0 mesons is measured to be negative and larger than that of light-flavor mesons which is in a qualitative agreement with hydrodynamic model predictions with a tilted QGP bulk. View Full-Text
Keywords: Quark-Gluon Plasma; open-charm hadrons; nuclear modification factor; elliptic flow; directed flow Quark-Gluon Plasma; open-charm hadrons; nuclear modification factor; elliptic flow; directed flow
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Vanek, J. Open-Charm Hadron Measurements in Au+Au Collisions at √sNN = 200 GeV by the STAR Experiment. Universe 2019, 5, 196.

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