Heavy Charged Gauge Bosons with General CP Violating Couplings

TL;DR

This paper investigates how general CP-violating couplings of hypothetical heavy gauge bosons, like W', can induce a top quark EDM, constraining their properties using experimental limits.

Contribution

It derives the most general interaction Lagrangian for W' with top and bottom quarks, including complex V-A and V+A couplings, and links these to top EDM constraints.

Findings

Predicted ranges for W' mass and couplings based on top EDM limits.

Showed that W' interactions can generate measurable top EDM at one loop.

Provided bounds on new physics parameters from existing experimental data.

Abstract

Heavy gauge bosons such as $W^{\prime}$ are expected to exist in many extensions of the Standard Model. In this paper, it is shown that the most general Lagrangian for the interaction of $W^{\prime}$ with top and bottom quarks which consists of V-A and V+A structure with in general complex couplings produces an Electric Dipole Moment (EDM) for the top quark at one loop level. We predict the allowed ranges for the mass and couplings of $W^{\prime}$ by using the upper limit on the top quark EDM.