Calculating gluon one-loop amplitudes numerically

Abstract

This note reports on an independent implementation of calculating one-loop amplitudes semi-numerically using generalized unitarity techniques. The algorithm implemented in form of a C++ code closely follows the method by Ellis, Giele, Kunszt and Melnikov. For the case of gluons, the algorithm is briefly reviewed. Double-precision results are presented documenting the accuracy and efficiency of this computation.

Contribution to Proceedings of LCWS08 and ILC08

References in corpus (8)

• Comix, a new matrix element generator
• CutTools: a program implementing the OPP reduction method to compute one-loop amplitudes
• Scalar one-loop integrals for QCD
• An Automated Implementation of On-Shell Methods for One-Loop Amplitudes
• Full one-loop amplitudes from tree amplitudes
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Cited by in corpus (9)

• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• One-loop calculations in quantum field theory: from Feynman diagrams to unitarity cuts
• Scattering AMplitudes from Unitarity-based Reduction Algorithm at the Integrand-level
• A proposal for a standard interface between Monte Carlo tools and one-loop programs
• Multi-gluon one-loop amplitudes using tensor integrals
• A Forward Branching Phase-Space Generator
• Next-to-leading order diphoton+2-jet production at the LHC
• Precise evaluation of the Cut Constructible part of one loop amplitudes within D-dimensional unitarity
• Calculation of QCD loops using tree-level matrix elements