期刊
PHYSICS LETTERS B
卷 742, 期 -, 页码 375-382出版社
ELSEVIER
DOI: 10.1016/j.physletb.2015.02.008
关键词
-
资金
- Research Executive Agency (REA) of the European Union [PITN-GA-2010-264564, PITN-GA-2012-316704]
- MIUR (Italy) [2010YJ2NYW_006]
- University of Torino
- Compagnia di San Paolo [ORTO11TPXK]
- Netherlands Foundation for Fundamental Research on Matter (FOM) programme Theoretical Particle Physics in the Era of the LHC [104]
- Netherlands Organisation for Scientific Research (NWO)
- UK Science and Technology Facilities Council (STFC)
- INFN
- STFC [ST/J000442/1, ST/L000466/1, ST/L000458/1, ST/G000522/1, ST/J000329/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L000466/1, ST/J000329/1, ST/L000458/1, ST/J000442/1, ST/G000522/1] Funding Source: researchfish
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 factorisationat 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. (C) 2015 The Authors. Published by Elsevier B.V.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据