Decoupling theorem in top productions/decays revisited -- To what extent can we understand it visually?

Abstract

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.

LaTeX_2e, 16 pages, 7 figures, Version accepted for publication in Int. J. Mod. Phys. A

References in corpus (4)

• Probing anomalous Wtb couplings in top pair decays
• Lepton distribution as a probe of new physics in production and decay of the t quark and its polarization
• Decoupling of Anomalous Top-Quark-Decay Vertices in Angular Distribution of Secondary Particles
• Secondary particles spectra in the decay of a polarized top quark with anomalous $tWb$ coupling

Cited by in corpus (2)

• Symbolic expressions for fully differential single top quark production cross section and decay width of polarized top quark in the presence of anomalous Wtb couplings
• Why the angular distribution of the top decay lepton is unchanged by anomalous $tbW$ coupling