The strong CP puzzle and axions

TL;DR

This paper reviews the strong CP problem, axion models, and explores how axions might connect to other Standard Model puzzles like neutrino masses and baryogenesis.

Contribution

It provides an overview of axion models and discusses novel ideas on their potential role in solving multiple Standard Model puzzles.

Findings

Axions can address the strong CP problem.

Mixing Peccei-Quinn symmetry with baryon and lepton numbers offers new solutions.

Axions might contribute to neutrino mass and baryogenesis explanations.

Abstract

In the first part of this talk, after a brief presentation of the strong CP puzzle, the construction of axion models and their main phenomenological features are described. In the second part, the possibility to mix the Peccei-Quinn symmetry with baryon and lepton numbers is discussed, showing that the axion could ultimately play a role in other puzzles of the Standard Model like the smallness of neutrino masses or baryogenesis.