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arXiv 0709.0614hep-ph
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核子的动力学部分子分布与甚小x物理

Dynamical parton distributions of the nucleon and very small-x physics

M. Glück, P. Jimenez-Delgado, E. Reya

摘要:

利用最近的DIS测量(F_{2,L})和双轻子和高E_{T}喷流产生的数据,我们确定的动力学部分子分布的核子辐射产生的类价正输入分布在最佳选择的低分辨率尺度。这些比较与“标准”的分布产生的积极的输入分布在一些固定的和更高的分辨率尺度。结果表明,对于本文所考虑的微扰QCD的次一阶非线性光学(\bar{MS},DIS),其动力学分布的不确定度比标准分布的不确定度小。这尤其适用于目前尚未探索的极小x区域,该区域与在天体物理学应用中评估高能截面有关。值得注意的是,我们的新的动力学分布是兼容的,在目前确定的不确定性,与以前确定的动力学部分子分布。

英文摘要:

Utilizing recent DIS measurements (F_{2,L}) and data on dilepton and high-E_{T} jet production we determine the dynamical parton distributions of the nucleon generated radiatively from valence-like positive input distributions at optimally chosen low resolution scales. These are compared with `standard' distributions generated from positive input distributions at some fixed and higher resolution scale. It is shown that up to the next to leading order NLO(\bar{MS}, DIS) of perturbative QCD considered in this paper, the uncertainties of the dynamical distributions are, as expected, smaller than those of their standard counterparts. This holds true in particular in the presently unexplored extremely small-x region relevant for evaluating ultrahigh energy cross sections in astrophysical applications. It is noted that our new dynamical distributions are compatible, within the presently determined uncertainties, with previously determined dynamical parton distributions.

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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