An Automated Implementation of On-Shell Methods for One-Loop Amplitudes

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dc.creatorBerger, C. F.
dc.creatorBern, Z.
dc.creatorDixon, L. J.
dc.creatorCordero, F. Febres
dc.creatorForde, D.
dc.creatorIta, H.
dc.creatorKosower, D. A.
dc.creatorMaitre, D.
dc.date2008-03-28
dc.date.accessioned2026-07-07T11:49:25Z
dc.date.available2026-07-07T11:49:25Z
dc.descriptionWe present the first results from BlackHat, an automated C++ program for calculating one-loop amplitudes. The program implements the unitarity method and on-shell recursion to construct amplitudes. As input to the calculation, it uses compact analytic formulae for tree amplitudes for four-dimensional helicity states. The program performs all related computations numerically. We make use of recently developed on-shell methods for evaluating coefficients of loop integrals, introducing a discrete Fourier projection as a means of improving efficiency and numerical stability. We illustrate the numerical stability of our approach by computing and analyzing six-, seven- and eight-gluon amplitudes in QCD and comparing against previously-obtained analytic results.
dc.description38 pages, 10 figures, RevTex
dc.identifierhttps://arxiv.org/abs/0803.4180
dc.identifierhttp://arxiv.org/abs/0803.4180
dc.identifierPhys.Rev.D78:036003,2008
dc.identifierdoi:10.1103/PhysRevD.78.036003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/203226
dc.subjectHigh Energy Physics - Phenomenology
dc.titleAn Automated Implementation of On-Shell Methods for One-Loop Amplitudes
dc.typetext

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