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arXiv 1401.1698nucl-ex
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LHC上Pb-Pb碰撞中D介子核修正因子和v $_2$

D-meson nuclear modification factor and v$_2$ in Pb-Pb collisions at the LHC

Elena Bruna

摘要:

我们提出了开放重味的ALICE结果,专注于通过位移衰变拓扑的魅力介子的独家重建。这些测量得益于2011年收集的大量Pb-Pb统计数据。对D介子核修正因子Raa的计算结果表明,在较大的动量范围内,中心碰撞中D介子的产额相对于双标度pp碰撞有所抑制。与非即时J/psi的Raa(用CMS测量)的比较表明魅力和美丽的抑制差异,正如根据能量损失模型中预测的质量等级所预期的那样。本文还讨论了粲介子方位各向异性的测量。在半周边事件中,对于横动量2<pT<6 GeV/c,观测到的正的二次傅里叶谐波v2是对粲夸克集体运动的一个暗示。上面讨论的结果也与理论模型进行了比较。

英文摘要:

We present the ALICE results on open heavy flavour, focusing on the exclusive reconstruction of charmed mesons via displaced decay topologies. These measurements benefit from the large Pb-Pb statistics collected in 2011. The results on the nuclear modification factor Raa for D mesons indicate a suppression of their yield in central collisions relative to binary-scaled pp collisions in a large momentum range. The comparison to the Raa of non-prompt J/psi (measured with CMS) indicates a difference in the suppression of charm and beauty, as expected according to the predicted mass hierarchy in energy loss models. The measurement of the azimuthal anisotropy of charmed mesons is also discussed. The observed positive second Fourier harmonic v2 for transverse momentum 2<pT<6 GeV/c in semi-peripheral events is a hint for collective motion of charm quarks. The results discussed above are also compared to theoretical models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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