Top Decays in the Standard Model and Beyond

TL;DR

This paper investigates rare top quark decays and potential new physics effects using effective theory, focusing on flavor-changing neutral currents and deviations in top decay vertices that could alter observable helicity fractions.

Contribution

It introduces an effective theory framework to analyze rare top decays and possible deviations from the Standard Model in top quark interactions.

Findings

Constraints on FCNC top decays derived

Predictions for deviations in W boson helicity fractions

Implications for new physics searches in top sector

Abstract

In these proceedings we explore the possibility of new physics manifesting itself in rare top quark decays. In particular, we adopt an effective theory description of FCNC t -> q V top quark decays and possible deviations from the SM form of tWb vertices which would affect the helicity fractions of the W boson produced in the main decay channel of top quark.