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QCD radiative corrections for h→bb¯ in the standard model dimension-6 effective field theory.

Gauld, R. and Pecjak, B.D. and Scott, D.J. (2016) 'QCD radiative corrections for h→bb¯ in the standard model dimension-6 effective field theory.', Physical review D., 94 (7). 074045.


We calculate the O(αs) QCD corrections to the inclusive h→bb¯ decay rate in the dimension-6 standard model effective field theory (SMEFT). The QCD corrections multiplying the dimension-6 Wilson coefficients which alter the hbb¯-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 QbG and QHG, which alter the gbb¯-vertex and introduce a hgg-vertex respectively, enter at O(αs) and induce sizeable corrections which are unrelated to the SM ones and cannot be anticipated through a renormalization-group analysis. We present compact analytic results for these contributions, which we recommend to be included in future phenomenological studies.

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Publisher statement:Reprinted with permission from the American Physical Society: Physical Review D 94, 074045 © (2016) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:11 October 2016
Date deposited:07 December 2016
Date of first online publication:31 October 2016
Date first made open access:07 December 2016

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