Input schemes in The SMEFT

by Darren Scott (University of Amsterdam/Nikhef)

Monday 14 Nov 2022, 10:30 → 11:30 Europe/Zurich

U3-05 (University of Milan Bicocca)

The Standard Model Effective Field Theory (SMEFT) allows for the parametrization of the possible low energy manifestations of heavy new physics in a large class of UV models in terms of Wilson coefficients of higher mass dimension operators appended to the SM. Ultimately one wants to perform a global fit on these coefficients. Currently LO and even many NLO calculations are available for processes in the SMEFT, however the choice of input scheme used in these calculations can have an impact on the number and type of Wilson coefficients appearing in the resulting expressions and, in the case of NLO calculations, alter the convergence of the perturbative series. In this talk I will present some results from investigating the impact choosing different input schemes can have on the outcome of perturbative calculations in the SMEFT. I will present some observations regarding the schemes themselves as well as look at decays of the W, Z, and Higgs bosons as illustrative examples.