期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 1, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP01(2011)141
关键词
QCD Phenomenology
资金
- Foundation for Fundamental Research of Matter (FOM)
- National Organization for Scientific Research (NWO)
- MIUR (Italy) [2006020509_004]
- European Community [MRTN-CT-2006-035505]
- STFC
- CERN
- STFC [ST/G00059X/1, ST/G004544/2, ST/J000442/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J000442/1, ST/G004544/2, ST/G00059X/1] Funding Source: researchfish
We consider the problem of soft gluon resummation for gauge theory amplitudes and cross sections, at next-to-eikonal order, using a Feynman diagram approach. At the amplitude level, we prove exponentiation for the set of factorizable contributions, and construct effective Feynman rules which can be used to compute next-to-eikonal emissions directly in the logarithm of the amplitude, finding agreement with earlier results obtained using path-integral methods. For cross sections, we also consider sub-eikonal corrections to the phase space for multiple soft-gluon emissions, which contribute to next-to-eikonal logarithms. To clarify the discussion, we examine a class of log(1- x) terms in the Drell-Yan cross-section up to two loops. Our results are the first steps towards a systematic generalization of threshold resummations to next-to-leading power in the threshold expansion.
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