期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 11, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP11(2019)002
关键词
QCD Phenomenology
资金
- COST (European Cooperation in Science and Technology) [CA16201 PARTICLEFACE]
- D-ITP consortium, a program of NWO - Dutch Ministry of Education, Culture and Science (OCW)
- Science and Technology Facilities Council (STFC) Consolidated Grant [ST/P000754/1]
- European Union [764850]
- STFC [1927010, ST/P000754/1] Funding Source: UKRI
Perturbative cross-sections in QCD are beset by logarithms of kinematic invariants, whose arguments vanish when heavy particles are produced near threshold. Contributions of this type often need to be summed to all orders in the coupling, in order to improve the behaviour of the perturbative expansion, and it has long been known how to do this at leading power in the threshold variable, using a variety of approaches. Recently, the problem of extending this resummation to logarithms suppressed by a single power of the threshold variable has received considerable attention. In this paper, we show that such next-to-leading power (NLP) contributions can indeed be resummed, to leading logarithmic (LL) accuracy, for any QCD process with a colour-singlet final state, using a direct generalisation of the diagrammatic methods available at leading power. We compare our results with other approaches, and comment on the implications for further generalisations beyond leading-logarithmic accuracy.
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