CKM-suppressed top quark decays t -> q + W in the SM and beyond

TL;DR

This paper examines CKM-suppressed top quark decays within the Standard Model and beyond, evaluating new physics effects and discussing potential detection at future colliders like the ILC.

Contribution

It provides a detailed analysis of rare top decays including new physics corrections in effective models and the MSSM, extending understanding of beyond Standard Model effects.

Findings

New physics can significantly modify decay rates.

Effective models with right-handed currents predict observable deviations.

MSSM contributions could enhance rare decay signals.

Abstract

Top quark decays are of particular interest as a mean to test the standard model (SM) predictions, both for dominant (t -> b + W) and rare decays (t -> q + W, cV, cVV, c phi^{0}, bWZ). As the latter are highly suppressed, they become an excellent window to probe the predictions of thories beyond the SM. In particular, we evaluate the corrections from new physics to the CKM-suppressed SM top quark decay t -> q + W (q = d, s), both within the an effective model with right-handed currents and the MSSM. We also discuss the perspectives to probe those predictions at the ILC.