Effective theories of universal theories

Wells, James D.; Zhang, Zhengkang

doi:10.1007/jhep01(2016)123

Cited by 64 publications

(75 citation statements)

References 145 publications

(225 reference statements)

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“…(2) are in general not simultaneously diagonalizable, leading to flavor violating effects which are not present in the SM. The running of C dH also introduces further flavor violating effects which should be considered [32,55]. We follow the procedure taken in previous work [45], imposing a minimal flavor violation (MFV) scenario [56,57] and setting V tb ¼ 1 throughout.…”

Section: A Preliminariesmentioning

confidence: 99%

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

2016

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. (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.

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Section: A Preliminariesmentioning

confidence: 99%

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

2016

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“…There are 16 of them one can possibly write down that are independent and CP-even, as we have shown in [8], so the effective theory of universal theories has a 16-dimensional parameter space, independent of the SMEFT basis choice. In turn, they can be mapped onto 16 independent phenomenological parameters, called "universal parameters" in [8], 5 of which coincide with the familiar oblique parameters. At leading order (LO) in v 2 Λ 2 , they lead to a universal pattern of deviations from the SM.…”

Section: Introductionmentioning

confidence: 99%

“…2 Note, however, that in some of these references, bounds on the oblique parameters are used to constrain the SMEFT parameter space possibly beyond the universal theories subspace, which can lead to inconsistencies as argued in [8] (see also [9]). The results should therefore be interpreted with caution.…”

Section: Jhep06(2016)122mentioning

confidence: 99%

“…In particular, the 16-dimensional parameter space of universal theories, being a subspace of the full SMEFT parameter space, is not guaranteed to be closed under renormalization group (RG) evolution. In fact, it is intuitively clear that nonuniversal effects can indeed be generated by RG, because even if one starts with a bosonic basis (consisting of 16 independent bosonic operators) [8], fermionic operators, i.e. operators containing SM fermions, can be generated that are not organized into the SM currents and hence cannot be eliminated in favor of bosonic operators.…”

Section: Introductionmentioning

confidence: 99%

“…Reconciliation of the oblique parameters formalism and the more general SMEFT is based on the realization that the former is generally speaking only applicable to universal theories, a restricted class of BSM theories whose SMEFT representation can be cast in a form that involves bosonic operators only [8] (see also [9] for an earlier study with similar motivations). By bosonic operators, we mean dimension-6 operators built from the SM bosons.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Renormalization group evolution of the universal theories EFT

Wells¹,

Zhang²

2016

J. High Energ. Phys.

Self Cite

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Abstract:The conventional oblique parameters analyses of precision electroweak data can be consistently cast in the modern framework of the Standard Model effective field theory (SMEFT) when restrictions are imposed on the SMEFT parameter space so that it describes universal theories. However, the usefulness of such analyses is challenged by the fact that universal theories at the scale of new physics, where they are matched onto the SMEFT, can flow to nonuniversal theories with renormalization group (RG) evolution down to the electroweak scale, where precision observables are measured. The departure from universal theories at the electroweak scale is not arbitrary, but dictated by the universal parameters at the matching scale. But to define oblique parameters, and more generally universal parameters at the electroweak scale that directly map onto observables, additional prescriptions are needed for the treatment of RG-induced nonuniversal effects. We perform a RG analysis of the SMEFT description of universal theories, and discuss the impact of RG on simplified, universal-theories-motivated approaches to fitting precision electroweak and Higgs data.

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Low-energy phenomenology of scalar leptoquarks at one-loop accuracy

Gherardi

Marzocca

Venturini

2021

J. High Energ. Phys.

101

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We perform a complete study of the low-energy phenomenology of S1 and S3 leptoquarks, aimed at addressing the observed deviations in B-meson decays and the muon magnetic dipole moment. Leptoquark contributions to observables are computed at one-loop accuracy in an effective field theory approach, using the recently published complete one-loop matching of these leptoquarks to the Standard Model effective field theory. We present several scenarios, discussing in each case the preferred parameter space and the most relevant observables.

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Effective theories of universal theories

Cited by 64 publications

References 145 publications

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

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

Renormalization group evolution of the universal theories EFT

Low-energy phenomenology of scalar leptoquarks at one-loop accuracy

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