UvA-DARE (Digital Academic The method of regions and next-to-soft corrections in Drell-Yan production
UvA-DARE (Digital Academic The method of regions and next-to-soft corrections in Drell-Yan production
复制标题
DOI：
--
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
E. Laenen;L. Magnea;L. Vernazza
中科院分区：
文献类型：
--
作者：
E. Laenen;L. Magnea;L. Vernazza
我们进行了一个案例研究的胶子辐射的行为超出软近似，作为一个例子，在NNLO的Drell-Yan生产截面。我们仔细区分了程函展开和阈值变量1 − z的幂展开，前者是软胶子能量的幂，后者涉及重要的硬共线效应。针对实虚干扰对NNLO Drell-Yan K因子的贡献，我们使用区域方法对阈值扩展中的所有相关贡献进行分类，直到下一个领先功率。用这种方法，我们重现精确的两个循环的结果所需的精度，包括z -独立的非对数的贡献，我们精确地识别软共线干扰的起源，打破简单的软胶子因式分解在下一个程函水平。我们的研究结果铺平了道路的发展下一个领先的功率阈值factorisation公式，并澄清了一组最近提出的下一个软定理循环校正的性质。版权所有© 2015作者.由爱思唯尔公司出版。这是一篇开放获取的文章，使用CC BY许可证（http：//creativecommons.org/licenses/by/4.0/）。由SCOAP 3提供资金。
We perform a case study of the behaviour of gluon radiation beyond the soft approximation, using as an example the Drell–Yan production cross section at NNLO. We draw a careful distinction between the eikonal expansion, which is in powers of the soft gluon energies, and the expansion in powers of the threshold variable 1 − z , which involves important hard-collinear effects. Focusing on the contribution to the NNLO Drell–Yan K-factor arising from real–virtual interference, we use the method of regions to classify all relevant contributions up to next-to-leading power in the threshold expansion. With this method, we reproduce the exact two-loop result to the required accuracy, including z -independent non-logarithmic contributions, and we precisely identify the origin of the soft-collinear interference which breaks simple soft-gluon factorisation at next-to-eikonal level. Our results pave the way for the development of a general factorisation formula for next-to-leading-power threshold logarithms, and clarify the nature of loop corrections to a set of recently proposed next-to-soft theorems. © 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP 3 .