One-loop weak corrections to Higgs production

Hirschi, Valentin (0000 0001 2156 2780, ETH Zürich, Rämistrasse 101, Zürich, 8092, Switzerland) ; Lionetti, Simone (0000 0000 8700 0572, Institute for Particle Physics Phenomenology, Durham University, South Road, Durham, DH1 3LE, U.K.) ; Schweitzer, Armin (0000 0001 2156 2780, ETH Zürich, Rämistrasse 101, Zürich, 8092, Switzerland)

07 May 2019

Abstract: We compute mixed QCD-weak corrections to inclusive Higgs production at the LHC from the partonic process gg → H q q ¯ $$ gg\to Hq\overline{q} $$ . We start from the UV- and IR-finite oneloop weak amplitude and consider its interference with the corresponding one-loop QCD amplitude. This contribution is a O α s α $$ \mathcal{O}\left({\alpha}_s\alpha \right) $$ correction to the leading-order gluon-fusion cross section, and was not numerically assessed in previous works. We also compute the cross section from the square of this weak amplitude, suppressed by O α 2 $$ \mathcal{O}\left({\alpha}^2\right) $$ . Finally, we consider contributions from the partonic process gq → Hq , which are one order lower in α s , as a reference for the size of terms which are not enhanced by the large gluon luminosity. We find that, given the magnitude of the uncertainties on current state-of-the-art predictions for Higgs production, all contributions computed in this work can be safely ignored, both fully inclusively and in the boosted Higgs regime. This result supports the approximate factorisation of QCD and weak corrections to that process.

Published in: JHEP 1905 (2019) 002
Published by: Springer/SISSA
DOI: 10.1007/JHEP05(2019)002
arXiv: 1902.10167
License: CC-BY-4.0

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