SciPost Phys. 13, 112 (2022) ·
published 21 November 2022
We present the three-body decay of the Higgs boson into two leptons and a photon to dimension-eight in the Standard Model Effective Field Theory (SMEFT). In order to obtain this result we interfere the full one-loop Standard Model result with the tree-level result in the SMEFT. This is the first calculation of the partial width of the Higgs boson into two leptons and a photon in the SMEFT to incorporate the full one-loop dependence for the Standard Model as well as the full tree level dimension-eight dependence in the SMEFT. We find that this channel can aid in distinguishing strongly interacting and weakly interacting UV completions of the SMEFT under standard assumptions. We also find that this channel presents the opportunity to distinguish different operator Classes within the SMEFT, potentially including contact $H\bar\ell\ell\gamma$ operators which are first generated only at dimension-eight in the SMEFT.
SciPost Phys. 11, 097 (2021) ·
published 26 November 2021
Making use of the geometric formulation of the Standard Model Effective Field Theory we calculate the one-loop tadpole diagrams to all orders in the Standard Model Effective Field Theory power counting. This work represents the first calculation of a one-loop amplitude beyond leading order in the Standard Model Effective Field Theory, and discusses the potential to extend this methodology to perform similar calculations of observables in the near future.
SciPost Phys. 10, 144 (2021) ·
published 14 June 2021
We verify Standard Model Effective Field Theory Ward identities to one loop order when background field gauge is used to quantize the theory. The results we present lay the foundation of next to leading order automatic generation of results in the SMEFT, in both the perturbative and non-perturbative expansion using the geoSMEFT formalism, and background field gauge.
SciPost Phys. 6, 064 (2019) ·
published 5 June 2019
We present a global analysis of the Higgs and electroweak sector based on LHC
Run II and electroweak precision observables. We show which measurements
provide the leading constraints on Higgs-related operators, and how the
achieved LHC precision makes it necessary to combine rate measurements with
electroweak precision observables. The SFitter framework allows us to include
kinematic distributions beyond pre-defined ATLAS and CMS observables,
independently study correlations, and avoid Gaussian assumptions for theory
uncertainties. These Run II results are a step towards a precision physics
program at the LHC, interpreted in terms of effective operators.