A supersimple analysis of $e^-e^+\to W^- W^+$ at high energy

TL;DR

This paper derives simple, accurate expressions for dominant helicity amplitudes in high-energy $e^-e^+ o W^- W^+$ processes within the Standard Model and MSSM, aiding in new physics searches at future colliders.

Contribution

It introduces supersimple formulas for key amplitudes, highlighting their dynamical content and usefulness in identifying new physics effects.

Findings

Supersimple expressions accurately describe dominant amplitudes.

The approach distinguishes SM from potential new physics contributions.

Numerical results confirm the effectiveness of the simplified formulas.

Abstract

Studying $e^-e^+\to W^- W^+$ at the 1loop electroweak (EW) order, we derive very accurate and simple expressions for the four Helicity Conserving (HC) amplitudes, which dominate this process at high energies. The calculations are done in both, the SM and MSSM frameworks. Such expressions, called supersimple (sim), nicely emphasize the dynamical contents of each framework. Numerical illustrations are presented, which show the accuracy of this description, and how it can be used for identifying possible additional new physics contributions; like e.g. Anomalous Gauge Couplings (AGC) or a new $Z'$ vector boson exchange. The procedure is useful even if only SM is visible at the future Linear Collider energies.