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arXiv 1402.4079hep-ph
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如何为双部分子分布的QCD演化施加初始条件?

How to impose initial conditions for QCD evolution of double parton distributions?

Krzysztof Golec-Biernat, Emilia Lewandowska

摘要:

本文采用双部分子分布函数(DPDF)描述双部分子散射。DPDF通过QCD演化方程以硬标度演化,该方程服从非平凡动量和价夸克数求和规则。我们描述了一种尝试,以构建初始条件的发展方程,正好满足这些总和规则,并讨论其缺点。我们还讨论了在小的部分子动量分数下,DPDF分解为两个单部分子分布函数的乘积。

英文摘要:

Double parton distribution functions (DPDFs) are used in the QCD description of double parton scattering. The DPDFs evolve with hard scales through QCD evolution equations which obey nontrivial momentum and valence quark number sum rules. We describe an attempt to construct initial conditions for the evolution equations which exactly fulfil these sum rules and discuss its shortcomings. We also discuss the factorization of the DPDFs into a product of two single parton distribution functions at small values of the parton momentum fractions.

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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