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arXiv 0905.1399hep-ph
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完全非积分形式的QCD演化

QCD evolution in the fully unintegrated form

S. Jadach, M. Skrzypek

摘要:

QCD中部分子分布函数的次领先阶(NLO)演化是轻子-强子和强子-强子对撞机数据分析的“工业标准”。标准的NLO DGRID演化是针对包含性(集成)PDF制定的,并且使用包含性NLO内核来完成。我们在这里报告正在进行的项目,称为KRKMC,其中NLO DIGITAL演化执行的独家multiparton(完全未集成)的分布(ePDF的)的帮助下的独家内核。这些内核计算的非单态演化的费曼图的韧致辐射子集的两部分子相空间内,使用Curci-Furmanski-Petronzio因式分解计划。在模拟单夸克辐射源多胶子辐射的Monte Carlo程序中,实现了多部分子分布和多个专用NLO核的使用。高统计测试($\sim 10^{9}$事件)表明,新方案在实践中工作得很好,在包容性水平上与传统的包容性非线性光学动态演化是等效的。一旦完成,这个蒙特卡罗模块的目的是作为一个积木的非线性光学部分子簇射蒙特卡罗,在LHC的W/Z生产和ep散射,以及其他微扰QCD为基础的蒙特卡罗项目的起点。

英文摘要:

The next-to-leading order (NLO) evolution of the parton distribution functions (PDF's) in QCD is the "industry standard" in the lepton-hadron and hadron-hadron collider data analysis. The standard NLO DGLAP evolution is formulated for inclusive (integrated) PDFs and is done using inclusive NLO kernels. We report here on the ongoing project, called KRKMC, in which NLO DGLAP evolution is performed for the exclusive multiparton (fully unintegrated) distributions (ePDF's) with the help of the exclusive kernels. These kernels are calculated within the two-parton phase space for bremsstrahlung subset of the Feynman diagrams of the non-singlet evolution, using Curci-Furmanski-Petronzio factorization scheme. The multiparton distribution with multiple use of the exclusive NLO kernels is implemented in the Monte Carlo program simulating multi-gluon emission from single quark emitter. With high statistics tests ($\sim 10^{9}$ events) it is shown that the new scheme works perfectly well in practice and is equivalent at the inclusive level with the traditional inclusive NLO DGLAP evolution. Once completed, this Monte Carlo module is aimed as a building block for the NLO parton shower Monte Carlo, for W/Z production at LHC and for ep scattering, as well as a starting point for other perturbative QCD based Monte Carlo projects.

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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