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arXiv 0706.1902hep-ph
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F_2 ^p(x,Q^2)的曲率作为小x区域扰动QCD演化的一个探索

The Curvature of F_2^p(x, Q^2) as a Probe of Perturbative QCD Evolutions in the small-x Region

Cristian Pisano

摘要:

本文研究了部分子分布的微扰非线性光学和非线性光学QCD演化,特别是在(非常)小x区域,它们与最近F_2^p(x,Q^2)的精确测量结果符合得很好。这些预测结果也是相当不敏感的因式分解方案(MS或DIS)的具体选择。微扰QCD演化的一个特征是F_2 ^p的正曲率,它随x的减小而增大。这种微扰稳定的预言为微扰QCD的有效性范围提供了一个灵敏的检验。

英文摘要:

Perturbative NLO and NNLO QCD evolutions of parton distributions are studied, in particular in the (very) small-x region, where they are in very good agreement with all recent precision measurements of F_2^p(x,Q^2). These predictions turn out to be also rather insensitive to the specific choice of the factorization scheme (MS or DIS). A characteristic feature of perturbative QCD evolutions is a positive curvature of F_2^p which increases as x decreases. This perturbatively stable prediction provides a sensitive test of the range of validity of perturbative QCD.

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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