Search for physics beyond the standard model in top quark production with additional leptons in the context of efective feld theory

Abstract

A search for new physics in top quark production with additional fnal-state leptons is performed using data collected by the CMS experiment in proton-proton collisions at √ s = 13 TeV at the LHC during 2016–2018. The data set corresponds to an integrated luminosity of 138 fb−1 . Using the framework of efective feld theory (EFT), potential new physics efects are parametrized in terms of 26 dimension-six EFT operators. The impacts of EFT operators are incorporated through the event-level reweighting of Monte Carlo simulations, which allows for detector-level predictions. The events are divided into several categories based on lepton multiplicity, total lepton charge, jet multiplicity, and b-tagged jet multiplicity. Kinematic variables corresponding to the transverse momentum (pT) of the leading pair of leptons and/or jets as well as the pT of on-shell Z bosons are used to extract the 95% confdence intervals of the 26 Wilson coefcients corresponding to these EFT operators. No signifcant deviation with respect to the standard model prediction is found.