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arXiv 1602.01829hep-ph
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两个环上的快度重整化TMD软函数和束函数

Rapidity renormalized TMD soft and beam functions at two loops

Thomas Luebbert, Joel Oredsson, Maximilian Stahlhofen

摘要:

我们在快度重整化群(RRG)框架内计算了LHC上产生色中性终态的横向动量相关(TMD)软函数,以达到次-次-领先阶(NNLO)。我们使用这个结果提取的通用重整化TMD梁函数(又名TMDPDF)在相同的计划,并在相同的顺序从已知的结果在另一个计划。我们推导出软梁函数的对数结构的递推关系,我们用它来交叉检查我们的计算。我们还明确证实了非阿贝尔指数的TMD软功能在RRG框架中的两个循环。我们的结果提供了成分的pT微分截面在NNLL'的RRG形式主义的图解预测。RRG提供了一个系统的框架,通过(R)RG演化恢复大(快度)的扰动,并评估相关的扰动不确定性。

英文摘要:

We compute the transverse momentum dependent (TMD) soft function for the production of a color-neutral final state at the LHC within the rapidity renormalization group (RRG) framework to next-to-next-to-leading order (NNLO). We use this result to extract the universal renormalized TMD beam functions (aka TMDPDFs) in the same scheme and at the same order from known results in another scheme. We derive recurrence relations for the logarithmic structure of the soft and beam functions, which we use to cross check our calculation. We also explicitly confirm the non-Abelian exponentiation of the TMD soft function in the RRG framework at two loops. Our results provide the ingredients for resummed predictions of pT-differential cross sections at NNLL' in the RRG formalism. The RRG provides a systematic framework to resum large (rapidity) logarithms through (R)RG evolution and to assess the associated perturbative uncertainties.

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