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arXiv 0809.4813hep-ph
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夸克能量损失对从核Drell-Yan实验数据中提取核海夸克分布的影响

The influence of quark energy loss on extracting nuclear sea quark distribution from nuclear Drell-Yan experimental data

Duan Chun-Gui, Liu Na

摘要:

利用两种典型的夸克能量损失参数化和仅由轻子-核深度非弹性散射实验数据确定的核部分子分布,对质子诱导的钨氘Drell-Yan微分截面比与束流质子和靶核中夸克动量分数的关系进行了首阶分析.结果表明,考虑夸克能量损失后,理论计算结果与实验结果符合得很好。夸克能量损失效应对$0.05\leq x_2\leq0.3$范围内的Drell-Yan微分截面比$R_{W/D}$产生约3%~ 11%的抑制。核Drell-Yan重靶数据的应用受到核海夸克分布约束的限制。

英文摘要:

By means of two typical kinds of quark energy loss parametrization and the nuclear parton distributions determined only with lepton-nuclear deep inelastic scattering experimental data, a leading order analysis are performed on the proton-induced Drell-Yan differential cross section ratios of tungsten versus deuterium as a function of the quark momentum fraction in the beam proton and target nuclei. It is found that the theoretical results with quark energy loss are in good agreement with the experimental data. The quark energy loss effect produce approximately 3% to 11% suppression on the Drell-Yan differential cross section ratios $R_{W/D}$ in the range $0.05\leq x_2\leq0.3$. The application of nuclear Drell-Yan data with heavy targets is remarkably subject to difficulty in the constraints of the nuclear sea-quark distribution.

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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