Measurements of open charm hadrons at the STAR experiment

Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions 2016

Simko, M.^1,2

Nuclear Physics Institute, Czech Academy of Sciences, Na Truhlarce 39/64, Praha

18086, Czech Republic^1

Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Brehova 7, Praha

11519, Czech Republic^2

关键词: Au+Au collisions;    Azimuthal anisotropy;    Center-of-mass energies;    Combined measurements;    Heavy ion collision;    Nuclear modification factors;    Quark-gluon plasma;    STAR experiment;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/832/1/012028/pdf
DOI  :  10.1088/1742-6596/832/1/012028

来源: IOP

【 摘 要 】

Because of their large masses, charm quarks are predominantly produced in the early stages of the heavy-ion collisions via hard scatterings. Therefore, they experience the entire evolution of the Quark-Gluon Plasma created in such collisions. Compared to light quarks, charm quarks thermalize more slowly. Therefore, the open charm hadrons present a unique probe to the properties of the hot and dense nuclear matter by measuring their energy loss and degree of thermalization in the medium. Furthermore, with the combined measurements of D0and Dsmesons, we can study multiple modes of coalescence of charm quarks with light quarks in heavy-ion collisions. Heavy Flavor Tracker at the STAR experiment enables full topological reconstruction of open charm hadrons which greatly improves measurements of D0mesons and opens the door to reconstructing the Dsmesons for the first time at RHIC. In this paper, we present the nuclear modification factor and azimuthal anisotropy for the D0and Dsmesons as well as the ratio of Ds/D0in Au+Au collisions at the center-of-mass energy .