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 formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416000609&_mathId=si2.gif&_user=111111111&_pii=S0375947416000609&_rdoc=1&_issn=03759474&md5=d7680ac42cb65c97e003efad998f27de" title="Click to view the MathML source">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 (formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416000609&_mathId=si3.gif&_user=111111111&_pii=S0375947416000609&_rdoc=1&_issn=03759474&md5=4222a46e9712a578a7b1c5c4cf89a258" title="Click to view the MathML source">R_AA$R_{AA}$) of formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416000609&_mathId=si2.gif&_user=111111111&_pii=S0375947416000609&_rdoc=1&_issn=03759474&md5=d7680ac42cb65c97e003efad998f27de" title="Click to view the MathML source">D⁰$D^0$ mesons in central Au+Au collisions at the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416000609&_mathId=si1.gif&_user=111111111&_pii=S0375947416000609&_rdoc=1&_issn=03759474&md5=f30b19f03d1a4e32852910075312d846">the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0375947416000609-si1.gif">$\sqrt{s_{NN}}=200\text{GeV}$ as a function of transverse momentum (formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416000609&_mathId=si4.gif&_user=111111111&_pii=S0375947416000609&_rdoc=1&_issn=03759474&md5=1ef19e641ad3adc988d1a6e2cc24c233" title="Click to view the MathML source">p_T$p_T$). New results confirm the strong suppression at high formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416000609&_mathId=si4.gif&_user=111111111&_pii=S0375947416000609&_rdoc=1&_issn=03759474&md5=1ef19e641ad3adc988d1a6e2cc24c233" title="Click to view the MathML source">p_T$p_T$ with a much improved precision, and show that the formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416000609&_mathId=si3.gif&_user=111111111&_pii=S0375947416000609&_rdoc=1&_issn=03759474&md5=4222a46e9712a578a7b1c5c4cf89a258" title="Click to view the MathML source">R_AA$R_{AA}$ at high formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416000609&_mathId=si4.gif&_user=111111111&_pii=S0375947416000609&_rdoc=1&_issn=03759474&md5=1ef19e641ad3adc988d1a6e2cc24c233" title="Click to view the MathML source">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 formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416000609&_mathId=si5.gif&_user=111111111&_pii=S0375947416000609&_rdoc=1&_issn=03759474&md5=6064e06ed4e3f04fa014d8be885eedbf" title="Click to view the MathML source">2πTD_S∼2-12$2\pi T{D}_S\sim 2\text{-}12$ can reproduce both the formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0375947416000609&_mathId=si6.gif&_user=111111111&_pii=S0375947416000609&_rdoc=1&_issn=03759474&md5=23024ec6705783147e525ae2d4c11ead" title="Click to view the MathML source">D⁰R_AA$D^0{R}_{AA}$ and v₂ data in Au+Au collisions at RHIC.