The oneloop amplitudes for Higgs + 4 partons with full mass effects
Abstract
We present compact analytic formulae for the oneloop amplitudes for Higgs + 4 parton scattering, 0 → ggggh, 0 →q ̄qggh and 0 →q ̄qq^{̄'}q'h, mediated by a loop of massive coloured quarks. We exploit the correspondence with a theory in which a massive coloured scalar circulates in the loop to avoid a proliferation in the number of terms in the result. In addition, we use momentum twistors and high precision numerical evaluations to simplify the expressions. The analytic results in this paper, in terms of spinor products, allow construction of an efficient numerical program to calculate the amplitude.
 Publication:

Journal of High Energy Physics
 Pub Date:
 May 2020
 DOI:
 10.1007/JHEP05(2020)079
 arXiv:
 arXiv:2002.04018
 Bibcode:
 2020JHEP...05..079B
 Keywords:

 NLO Computations;
 High Energy Physics  Phenomenology
 EPrint:
 45 pages, 1 figure