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arXiv 1402.7149hep-exnucl-ex
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PHENIX实验中$d$ $+$ Au碰撞的开放重味测量

Open heavy flavor measurements in $d$$+$Au collisions at PHENIX experiment

Sanghoon Lim

备注：
5 pages, 8 figures, talk in 2nd International Conference on New Frontiers in Physics (ICNFP 2013), 28 Aug - 5 Sep 2013, Kolymbari, Crete, Greece; to appear in EPJ Web of Conferences
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摘要：

重离子碰撞早期产生的重夸克是RHIC产生的稠密部分子介质的有效探针。PHENIX有能力通过中央臂谱仪（$|η|<0.35$）中的单电子和前（后）μ子谱仪（$1.2<|η|<2.2$）中的单μ子测量重夸克的产生。由于这些单轻子来自于开放的重味介子半轻子衰变，因此可以通过测量$d$ $+$ Au碰撞中的单轻子来研究初态冷核物质对重夸克产生的影响. PHENIX观测到中快度下$d$ $+$ Au碰撞中重味电子的大幅增强，这表明与Au $+$ Au碰撞中观察到的抑制相反，CNM对重夸克产生有很强的影响。通过对$d$ $+$ Au碰撞中前向（后向）快度下开放重味中单个μ子的测量，详细研究了快度依赖的CNM效应以及Au核内低（高）$x$部分子分布函数.我们讨论了最近的PHENIX重味测量，以及它们如何扩大我们对CNM效应的理解，并有助于解释重离子碰撞中的其他结果。

英文摘要：

The heavy quarks produced in the early stage of heavy-ion collisions are very effective probes of the dense partonic medium produced at RHIC. PHENIX has the ability to measure heavy quark production through single electrons in the central arm spectrometers ($|η|<0.35$) and single muons in the forward (backward) muon spectrometers ($1.2<|η|<2.2$). As these single leptons are from open heavy-flavor meson semi-leptonic decays, initial state cold nuclear matter effects on heavy quark production can be probed by measuring the single leptons in $d$$+$Au collisions. PHENIX have observed a large enhancement of heavy-flavor electrons in $d$$+$Au collisions at mid-rapidity, which indicates strong CNM effects on heavy quark production, in contrast to the suppression observed in Au$+$Au collisions. Measurement of single muons from open heavy flavor in $d$$+$Au collisions at forward (backward) rapidity provide detailed look into rapidity dependent CNM effects as well as the low (high) $x$ parton distribution function within Au nucleus. We discuss recent PHENIX heavy flavor measurements and how they expand our understanding of CNM effects and contribute to the interpretation of other results in heavy-ion collisions.

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