Heavy to light Higgs boson decays at NLO in the singlet extension of the Standard Model

F. Bojarski (Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, 53 Rue des Martyrs, F-38026, Grenoble Cedex, France) ; G. Chalons (Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, 53 Rue des Martyrs, F-38026, Grenoble Cedex, France) ; D. López-Val (Center for Cosmology, Particle Physics and Phenomenology CP3, Université catholique de Louvain, Chemin du Cyclotron 2, B-1348, Louvain-la-Neuve, Belgium) ; T. Robens (IKTP, Technische Universität Dresden, Zellescher Weg 19, D-01069, Dresden, Germany)

We study the decay of a heavy Higgs boson into a light Higgs pair at one loop in the singlet extension of the Standard Model. To this purpose, we construct several renormalization schemes for the extended Higgs sector of the model. We apply these schemes to calculate the heavy-to-light Higgs decay width Γ H → hh at next-to-leading order electroweak accuracy, and demonstrate that certain prescriptions lead to gauge-dependent results. We comprehensively examine how the NLO predictions depend on the relevant singlet model parameters, with emphasis on the trademark behavior of the quantum effects, and how these change under different renormalization schemes and a variable renormalization scale. Once all present constraints on the model are included, we find mild NLO corrections, typically of few percent, and with small theoretical uncertainties.

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      "value": "We study the decay of a heavy Higgs boson into a light Higgs pair at one loop in the singlet extension of the Standard Model. To this purpose, we construct several renormalization schemes for the extended Higgs sector of the model. We apply these schemes to calculate the heavy-to-light Higgs decay width \u0393 H \u2192 hh at next-to-leading order electroweak accuracy, and demonstrate that certain prescriptions lead to gauge-dependent results. We comprehensively examine how the NLO predictions depend on the relevant singlet model parameters, with emphasis on the trademark behavior of the quantum effects, and how these change under different renormalization schemes and a variable renormalization scale. Once all present constraints on the model are included, we find mild NLO corrections, typically of few percent, and with small theoretical uncertainties."
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Published on:
22 February 2016
Publisher:
Springer/SISSA
Published in:
Journal of High Energy Physics (2016)

DOI:
https://doi.org/10.1007/JHEP02(2016)147
arXiv:
1511.08120
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

Fulltext files: