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Higgs decay to fermion pairs at NLO in SMEFT.

Cullen, Jonathan M. and Pecjak, Benjamin D. (2020) 'Higgs decay to fermion pairs at NLO in SMEFT.', Journal of high energy physics., 2020 (11). 079.


The calculation of next-to-leading order (NLO) perturbative corrections at fixed operator dimension in Standard Model Effective Field Theory (SMEFT) has been a topic of much recent interest. In this paper we obtain the NLO corrections from dimension-6 operators to the Higgs boson decays h→ff¯¯¯, where the fermions f ∈ {μ, τ, c}. This extends previous results for h→bb¯¯ to all phenomenologically relevant Higgs boson decays into fermions, and provides the basis for future precision analyses of these decays within effective field theory. We point out the benefits of studying ratios of decay rates into different fermions in SMEFT, the most surprising of which is enhanced sensitivity to anomalous hγγ and hgg couplings induced by flavor-universal SMEFT operators, especially in scenarios where flavor-dependent Wilson coefficients are constrained by Minimal Flavor Violation.

Item Type:Article
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Publisher statement:This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Date accepted:05 October 2020
Date deposited:26 November 2020
Date of first online publication:17 November 2020
Date first made open access:26 November 2020

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