An alternative subtraction scheme for next-to-leading order QCD calculations
arXiv:1012.4948 · doi:10.1007/JHEP06(2011)144
Abstract
We propose a new subtraction scheme for next-to-leading order QCD calculations. Our scheme is based on the momentum mapping and on the splitting functions derived in the context of an improved parton shower formulation. Compared to standard schemes, the new scheme features a significantly smaller number of subtraction terms and facilitates the matching of NLO calculations with parton showers including quantum interference. We provide formulae for the momentum mapping and the subtraction terms, and present a detailed comparison with the Catani-Seymour dipole subtraction for a variety of 2 -> 2 scattering processes.
62 pages, 8 figures
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- What is a parton shower?
- Techniques for the treatment of IR divergences in decay processes at NLO and application to the top-quark decay
- Numerical resummation at subleading color in the strongly ordered soft gluon limit
- Numerical integration of subtraction terms
- Colourful FKS subtraction
- Quantifying quark mass effects at the LHC: A study of pp -> b anti-b b anti-b + X at next-to-leading order
- Random polarisations of the dipoles
- Nagy-Soper subtraction scheme for multiparton final states
- The matrix element method at next-to-leading order for arbitrary jet algorithms
- NLO QCD corrections to tW' and tZ' production in forward-backward asymmetry models
- Studies of Quantum Chromodynamics at the LHC
- Automated computation of scattering amplitudes