Theory Advances in BSM Physics

TL;DR

This paper reviews recent theoretical advances in Beyond the Standard Model physics, focusing on the Twin Higgs and Relaxion frameworks, their structures, phenomenological signatures, and unresolved issues.

Contribution

It provides a non-expert overview of two prominent BSM theories, highlighting their structures, phenomenology, and open problems.

Findings

Twin Higgs offers solutions to the hierarchy problem with distinctive signatures.

Relaxion provides a novel mechanism for stabilizing the Higgs mass.

Both frameworks present unique phenomenological predictions and challenges.

Abstract

Rather than attempting to summarise the full spectrum of recent advances in Beyond the Standard Model (BSM) theory, which are many, in this talk I will instead take the opportunity to focus on two frameworks related to the hierarchy problem currently receiving significant attention. They are the `Twin Higgs' and the `Relaxion'. I will summarise the basic underlying structure of these theories at a non-expert level and highlight some interesting phenomenological signatures or outstanding problems.