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首页> 外文期刊>Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions >Measurements of open charm production in Au plus Au collisions at root s(NN)=200 GeV with the STAR experiment at RHIC
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Measurements of open charm production in Au plus Au collisions at root s(NN)=200 GeV with the STAR experiment at RHIC

机译:在Root S(NN)的Au Plus Au碰撞中的开放式魅力测量= 200 GEV与RAH的明星实验

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We report in these proceedings on the measurements of collision centrality and transverse momentum (p(T)) dependences of the Lambda(+/-)(c) production in Au+Au collisions at root s(NN) = 200 GeV, using the STAR Heavy Flavor Tracker (HFT). The Lambda(+/-)(c) signal significance is greatly improved with the addition of the high-statistics data set collected in 2016 and the use of a supervised machine learning method for topological reconstruction of the decay vertices. The measured Lambda(+/-)(c)/D-0 ratio shows a significant enhancement compared to the PYTHIA prediction for p+p collisions, across the measured p(T) range. We also report on the updated measurements of D-0 nuclear modification factors R-AA and R-CP using the 2014 data with the HFT. The measured D-0 R-AA in central collisions is lower than unity across the p(T) interval of the measurement. The D-0 yields show strong suppression at high p(T) ( 6 GeV/c) in central collisions, consistent with that of light flavor hadrons. The c (c) over bar production cross section per binary nucleon collision at midrapidity in Au+Au collisions at 200 GeV is extracted based on the various charm hadron measurements by STAR. It is observed that while the charm hadrochemistry is significantly modified in Au+Au collisions compared to p+p collisions, the c (c) over bar production cross section at midrapidity remains consistent between Au+Au and p+p collisions.
机译:我们在这些诉讼程序中报告了碰撞中心和横向动量的测量(P(t))的λ(+/-)(c)生产的依次在Root s(nn)= 200 gev的碰撞中的依赖性,使用STAR重味跟踪(HFT)。添加到2016年收集的高统计数据集以及使用腐烂顶点的拓扑重建的监督机器学习方法,大大提高了Lambda(+/-)(c)信号意义。与P + P碰撞相比,测量的λ(+/-)(c)/ d-0比率显示出显着的增强,其在测量的p(t)范围内。我们还使用HFT的2014年数据报告D-0核修改因子R-AA和R-CP的更新测量。中央碰撞中的测量的D-0 R-AA低于测量的P(T)间隔的单位。 D-0产量在中央碰撞中以高p(曲率为6 gev / c)显示出强烈的抑制,与轻味强度的高p(& 6 gev / c)一致。根据恒星的各种魅力测量,提取每二元核核的C(c)在200GEV中的中+ Au碰撞中的每二元核碰撞碰撞。观察到,虽然与P + P碰撞相比,在Au + Au碰撞中显着修改了脉络剂,但在中溴磷的C(c)在Au + Au和P + P碰撞之间保持一致。

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