  I revisit here the decoupling theorem in top-quark productions/decays, which
states that the angular distribution of any final-particle produced in those
processes does not depend on any possible nonstandard top-quark decay
interactions at their leading order when certain conditions are satisfied.
Towards a simple, intuitive and visual understanding of this theorem, I will
study to what extent we could explain why such a theorem holds without relying
on any specific/detailed calculations.

High Energy Physics - Phenomenology;High Energy Physics - Experiment