A possible determination of the quark radiation length in cold nuclear matter

A possible determination of the quark radiation length in cold nuclear matter
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冷核物质中夸克辐射长度的可能测定

DOI:
10.1016/j.physletb.2011.09.045
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发表时间:
2010-10
期刊:
影响因子:
4.4
通讯作者:
Ben-Wei Zhang
Ben-Wei Zhang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
R B Neufeld;Ivan Vitev;Ben-Wei Zhang

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我们通过包括次高阶微扰效应和核介质的效应来计算质子-核碰撞中的微分 Drell-Yan 产生截面。我们证明,固定目标实验中的双轻子产生是研究大核中初始状态部分子能量损失和准确确定冷核物质的阻止本领的绝佳工具。我们对费曼 xF 值较大时 Drell-Yan 截面的衰减进行了理论预测,并表明对于低质子束能量,费米实验室 E906 的实验测量可以清楚地区分核阴影效应和能量损失效应。如果得到数据证实,我们的结果可能有助于确定冷核物质中夸克辐射长度X0∼10−13m。
We calculate the differential Drell–Yan production cross section in proton–nucleus collisions by including both next-to-leading order perturbative effects and effects of the nuclear medium. We demonstrate that dilepton production in fixed target experiments is an excellent tool to study initial-state parton energy loss in large nuclei and to accurately determine the stopping power of cold nuclear matter. We provide theoretical predictions for the attenuation of the Drell–Yan cross section at large values of Feynman xFand show that for low proton beam energies experimental measurements at Fermilabʼs E906 can clearly distinguish between nuclear shadowing and energy loss effects. If confirmed by data, our results may help determine the quark radiation length in cold nuclear matter X0∼10−13m.
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