Ken Mimasu (KCL)

Going global - Combining electroweak precision, diboson, Higgs and top data to search for new physics

Abstract: The Standard Model Effective Field Theory (SMEFT) is a well-established framework for indirect new physics searches in High Energy Physics. Thanks to the discovery of the Higgs boson and significant experimental and theoretical developments, it has become a core element of the LHC and future collider programmes. One of the key aspects of such bottom-up approaches is the need to remain agnostic about possible sources of deviations for SM predictions. This encourages a maximally global approach, interpreting many measurements to search for all possible new interactions. I will present the results of a recent analysis of this type that combines, for the first time, Electroweak precision, diboson and Higgs data with top quark measurements. We adopt two flavour scenarios: allowing operators that affect fermionic interactions either universally or in a way that singles out the top quark. I will highlight areas of complementarity between the datasets, including how top data helps indirectly constrain Higgs properties. Crucial inputs to this fit require the ability to incorporate one-loop effects in the SMEFT. I will briefly present SMEFTatNLO, the Monte Carlo implementation that enables such calculations in general purpose event generators. Finally, I will interpret the results in a suite of benchmark BSM scenarios, involving single-field extensions of the SM and discuss the scope for future improvements.