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arXiv 1202.3056hep-ph
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双部分子散射中的单微扰分裂图和双微扰分裂图

Single and Double Perturbative Splitting Diagrams in Double Parton Scattering

Jonathan R. Gaunt, W. James Stirling

摘要:

讨论了质子-质子双部分子散射(DPS)截面中两种不同类型的图--单微扰分裂图和双微扰分裂图的作用。使用明确的计算简单的图形,从这些类,我们表明,这些图形的治疗的“双PDF”框架描述的DPS截面,介绍了几年前由Snigirev和合作者,是不能令人满意的。我们建议,从单微扰分裂图的贡献,应包括在DPS的截面,虽然有不同的几何前因子的贡献,从'零微扰分裂'图。

英文摘要:

We discuss the role of two different types of diagram in the proton-proton double parton scattering (DPS) cross section - single and double perturbative splitting graphs. Using explicit calculations of simple graphs from these classes we show that the treatment of these graphs by the 'double PDF' framework for describing the DPS cross section, introduced a number of years ago by Snigirev and collaborators, is unsatisfactory. We suggest that a contribution from single perturbative splitting graphs should be included in the DPS cross section, albeit with a different geometrical prefactor to the contribution from 'zero perturbative splitting' graphs.

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