High-$\rm{p_T}$ LHC constraints on SMEFT operators affecting rare kaon and hyperon decays

TL;DR

This paper uses high-$p_T$ LHC data to constrain SMEFT operators influencing rare kaon and hyperon decays, showing complementary bounds and the impact of future high-luminosity runs.

Contribution

It establishes a framework connecting high-$p_T$ LHC observables with low-energy rare decay constraints within SMEFT, highlighting the complementarity of these probes.

Findings

High-$p_T$ LHC data constrains SMEFT operators affecting rare decays.

Rare kaon decay constraints are generally more restrictive than high-$p_T$ bounds.

High luminosity LHC can further reduce viable parameter space.

Abstract

We consider the constraints on new physics affecting rare kaon and hyperon decay as parametrized by a low energy effective theory that can be obtained from high-$\rm p_T$ observables at LHC. To this end, we match the relevant low energy Wilson coefficients onto those in SMEFT at dimension six and compute their contributions to charged dilepton, monolepton, monojets, and $\rm VH$ searches by ATLAS and CMS. Constraints from rare kaon decays are generally more restrictive, with the ones arising from high-$\rm p_T$ measurements complementing them along directions in parameter space to which the former are not sensitive. We also illustrate the effect of a high luminosity LHC run in reducing the viable parameter regions.