Nuclear Modification Factor of D⁰ Meson in Au + Au Collisions at

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• 作者：Guannan Xie^a ; ^b ; for the STAR Collaboration¹
• 关键词：Quark-gluon plasma ; Nuclear modification factor ; Heavy Flavor Tracker
• 刊名：Nuclear Physics A
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：956
• 期：Complete
• 页码：473-476
• 全文大小：251 K

文摘

Heavy-flavor quarks are dominantly produced in initial hard scattering processes and experience the whole evolution of the system in heavy-ion collisions at RHIC energies. Thus they are suggested to be an excellent probe to the medium properties through their interaction with the medium. In this proceedings, we report our first measurement of D⁰$D^0$ production via topological reconstruction using STAR's recently installed Heavy Flavor Tracker (HFT). We also report our new measurement of Nuclear Modification Factor (R_AA$R_{AA}$) of D⁰$D^0$ mesons in central Au+Au collisions at $\sqrt{s_{NN}}=200\text{GeV}$ as a function of transverse momentum (p_T$p_T$). New results confirm the strong suppression at high p_T$p_T$ with a much improved precision, and show that the R_AA$R_{AA}$ at high p_T$p_T$ are comparable with light hadrons (π  ) and with D meson measurements at the LHC. Furthermore, several theoretical calculations are compared to our data, and with charm diffusion coefficient 2πTD_S∼2-12$2\pi T{D}_S\sim 2\text{-}12$ can reproduce both the D⁰R_AA$D^0{R}_{AA}$ and v₂ data in Au+Au collisions at RHIC.