Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-09-24
JHEP 1001:036,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 4 figures, JHEP3 class, typos fixed
Scientific paper
10.1007/JHEP01(2010)036
We consider one-loop amplitudes of a Higgs boson coupled to gluons in the limit of a large top quark mass. We treat the Higgs as the real part of a complex field phi that couples to the self-dual field strengths and compute the one-loop corrections to the phi-NMHV amplitude, which contains one gluon of positive helicity whilst the remaining three have negative helicity. We use four-dimensional unitarity to construct the cut-containing contributions and a hybrid of Feynman diagram and recursive based techniques to determine the rational piece. Knowledge of the phi-NMHV contribution completes the analytic calculation of the Higgs plus four gluon amplitude. For completeness we also include expressions for the remaining helicity configurations which have been calculated elsewhere. These amplitudes are relevant for Higgs plus jet production via gluon fusion in the limit where the top quark is large compared to all other scales in the problem.
Badger Simon
Mastrolia Pierpaolo
Nigel Glover E. W.
Williams Ciaran
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