Status and prospects of precision analyses with $e^+e^-\to W^+W^-$

TL;DR

This paper reviews the current state and future prospects of precision calculations for the process $e^+e^- o W^+W^-$, emphasizing its role in electroweak analyses and new physics searches at future colliders.

Contribution

It provides expansion formulas for observables, demonstrates new physics effects in EFT, and explores the complementarity of $W^+W^-$ measurements with other precision data.

Findings

Current calculations support per-mil-level measurements.

Effective field theory framework for new physics effects.

Complementarity with other precision electroweak data.

Abstract

$e^+e^-\to W^+W^-$ is an integral part of the global precision analysis program which is becoming more relevant after the discovery of the Higgs boson. We analyze the current situation of precision calculations of inclusive $e^+e^-\to W^+W^-$ observables, and study the prospects of incorporating them into the framework of global precision electroweak analyses in light of per-mil-level cross section measurements at proposed future facilities. We present expansion formulas for the observables, making the dependence on the inputs clear. Also, the calculation of new physics effects is demonstrated in the effective field theory framework for universal theories. We go beyond the triple-gauge-couplings parametrization, and illustrate the complementarity of $e^+e^-\to W^+W^-$ and other precision data at the observables level.