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arXiv · 1607.06354

QCD radiative corrections for $h\to b\bar b$ in the Standard Model Dimension-6 EFT

Rhorry Gauld·Benjamin D. Pecjak·Darren J. Scott
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Abstract

We calculate the $\mathcal{O}(\alpha_s)$ QCD corrections to the inclusive $h\to b\bar b$ decay rate in the dimension-6 Standard Model Effective Field Theory (SMEFT). The QCD corrections multiplying the dimension-6 Wilson coefficients which alter the $hb\bar b$-vertex at tree-level are proportional to the Standard Model (SM) ones, so next-to-leading order results can be obtained through a simple rescaling of the tree-level decay rate. On the other hand, contributions from the operators $Q_{bG}$ and $Q_{HG}$, which alter the $gb\bar b$-vertex and introduce a $hgg$-vertex respectively, enter at $\mathcal{O}(\alpha_s)$ and induce sizeable corrections which are unrelated to the SM ones and cannot be anticipated through a renormalisation-group analysis. We present compact analytic results for these contributions, which we recommend to be included in future phenomenological studies.

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Rhorry Gauld, Benjamin D. Pecjak, Darren J. Scott. 2016-07-21. QCD radiative corrections for $h\to b\bar b$ in the Standard Model Dimension-6 EFT. https://doi.org/10.1103/physrevd.94.074045

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