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

Abstract

. (2016) 'QCD radiative corrections for hbb in the standard model dimension-6 e ective eld theory.', Physical review D., 94 (7). 074045.Further information on publisher's website:https://doi.org/10.1103/PhysRevD.94.074045Publisher's copyright statement:Reprinted with permission from the American Physical Society: Physical Review D 94, 074045 c (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, modi ed, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society. Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We calculate the Oðα s Þ 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 Q bG and Q HG , which alter the gbb-vertex and introduce a hgg-vertex respectively, enter at Oðα s Þ 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.

The Z decay width in the SMEFT: y t and λ corrections at one loop

“…Further, the demonstration of the robustness of interpreting W mass measurements in the SMEFT [34] supports the on-shell scheme employed and developed for the SMEFT in refs. [22,23] being of at least equal interest.…”

“…For results and discussion (with supporting calculations) characterizing various NLO corrections in the SMEFT see refs. [13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

“…In some cases, and in some schemes, the logs can dominate for classes of perturbative corrections [22]. In other cases, the logs are not very dominant numerically [14,21,23,28,29]. In either case, the logs would be reintroduced when mapping experimental constraints to the high scale theory.…”

Top quark decay at next-to-leading order in the standard model effective field theory

“…The situation in the SMEFT is slightly more complicated, as not all of the operators of Section 2 satisfy the symmetry of Eq. (14). Operators such as O (1) qq which are formed from the doublets q L satisfy the symmetry.…”

Dijets at Tevatron cannot constrain SMEFT four-quark operators

“…Much foundational work has gone into the SMEFT, enabling the sorts of analyses presented here. A complete basis of operators [6] and their renormalization behavior [7][8][9] are known, and significant effort has been invested in precision electroweak studies [10][11][12][13][14][15][16] and loop calculations of observables relevant to both electroweak data and hadron collider searches [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. The ultimate goal of all this effort is a global fit of all the data in terms of NP scale and Wilson coefficients, with which it will be possible to test any UV model, including those that haven't yet been invented, against the precise measurements made at the LHC and earlier experiments.…”