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AGH University of Science and Technology, Cracow, Poland.
University of Kentucky, Lexington, Kentucky 40506-0055, USA.
Phys Rev Lett. 2014 Oct 3;113(14):142301. doi: 10.1103/PhysRevLett.113.142301. Epub 2014 Sep 30.
We report the first measurement of charmed-hadron (D(0)) production via the hadronic decay channel (D(0) → K(-) + π(+)) in Au+Au collisions at sqrt[s(NN)] = 200 GeV with the STAR experiment. The charm production cross section per nucleon-nucleon collision at midrapidity scales with the number of binary collisions, N(bin), from p+p to central Au+Au collisions. The D(0) meson yields in central Au + Au collisions are strongly suppressed compared to those in p+p scaled by N(bin), for transverse momenta p(T) > 3 GeV/c, demonstrating significant energy loss of charm quarks in the hot and dense medium. An enhancement at intermediate p(T) is also observed. Model calculations including strong charm-medium interactions and coalescence hadronization describe our measurements.
我们通过STAR实验报告了在√[s(NN)] = 200 GeV的金离子与金离子碰撞中，通过强子衰变通道（D(0) → K(-) + π(+)）产生粲强子（D(0)）的首次测量结果。在中快度下，每核子-核子碰撞的粲产生截面随二元碰撞数N(bin)变化，范围从质子-质子碰撞到中心金离子-金离子碰撞。对于横向动量p(T) > 3 GeV/c，中心金离子-金离子碰撞中的D(0)介子产额与按N(bin)缩放的质子-质子碰撞中的产额相比受到强烈抑制，这表明粲夸克在热密介质中有显著的能量损失。在中间p(T)处也观察到了增强。包括强粲-介质相互作用和聚结强子化的模型计算描述了我们的测量结果。
