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from Part IV - Selected Topics beyond the Standard Model
Published online by Cambridge University Press: 06 February 2025
This chapter first focuses on the QCD vacuum θ and the related strong CP problem. We review the manifestation of theta in the QCD action or alternatively in the mass matrix, and in chiral perturbation theory. Beyond the Standard Model, the Peccei–Quinn formalism turns θ into an axion field. We discuss that approach and its implications in astrophysics and cosmology. Finally we consider the corresponding parameters for the SU(2)L gauge field and for QED. The former can be absorbed by field-redefinitions, but the latter leads to a linear combination of these two vacuum angles, which persists as a parameter of the Standard Model, but which is often ignored.
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