Electroweak constraints on new physics

TL;DR

This paper reviews how electroweak precision data constrains new physics models, focusing on Higgs mass bounds and the necessity of cancellations among new contributions to satisfy experimental limits.

Contribution

It provides a concise overview of electroweak constraints on new physics, emphasizing the interplay between model extensions and experimental bounds.

Findings

Electroweak data impose strict limits on new interactions.

Higgs mass bounds are derived from precision measurements.

Cancellations among new contributions are necessary for model viability.

Abstract

We briefly review the limits on new interactions implied by electroweak precision data. Special attention is payed to the bounds on the Higgs boson mass. We also comment on the required cancellation among the new contributions to precisely measured electroweak observables in any Standard Model extension, if the new particles have to evade the indirect constraints on their couplings and masses but still remain at the LHC reach.