Low Energy Probes of Physics Beyond the Standard Model

TL;DR

This paper discusses how low-energy experiments testing fundamental symmetries and neutrino properties can effectively explore new physics beyond the Standard Model, often surpassing high-energy collider capabilities.

Contribution

It provides a theoretical framework for understanding the potential of low-energy probes in detecting BSM physics and compares their reach to high-energy experiments.

Findings

Low-energy probes can access BSM mass scales comparable to or exceeding high-energy experiments.

Theoretical framework links low-energy measurements to BSM physics parameters.

Low-energy experiments offer complementary and sometimes superior sensitivity to new physics.

Abstract

Low-energy tests of fundamental symmetries and studies of neutrino properties provide a powerful window on physics beyond the Standard Model (BSM). In this article, we provide a basic theoretical framework for a subsequent set of articles that review the progress and opportunities in various aspects of the low-energy program. We illustrate the physics reach of different low-energy probes in terms of an effective BSM mass scale and illustrate how this reach matches and, in some cases, even exceeds that accessible at the high energy frontier.