Why the angular distribution of the top decay lepton is unchanged by anomalous tbW coupling

2018/09/17 by Rohini M. Godbole, Godbole, Rohini M., Michael E. Peskin +5
Physics and Astronomy · #Atomic and Subatomic Physics Research #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #hep-ex #hep-ph

paper · pdf · doi:10.48550/arxiv.1809.06285

4 pages, 2 figures. Added a footnote and consequently a few references

arxiv created 2018/10/31 · arxiv updated 2018/11/01

Abstract

We give a simple physical argument to understand the observation that the angular distribution of the top decay lepton depends only on the polarisation of the top and is independent of any anomalous tbW coupling to linear order.

Related

• Probing Anomalous Top-Couplings through the Final Lepton Angular and Energy Distributions at Polarized NLC
• Decay-lepton angular asymmetries in polarized e+e- -> t tbar as a measure of CP-violating dipole couplings of the top quark
• Longitudinal top polarisation measurement and anomalous Wtb coupling
• A New Decoupling Theorem in Top-Quark Physics
• Single top quark differential decay rate formulae including detector effects