(In)dependence of in the Higgs regime without axions

Research output: Contribution to journalArticle

Abstract

We revisit the issue of the vacuum angle dependence in weakly coupled (Higgsed) Yang-Mills theories. Two most popular mechanisms for eliminating physical dependence are massless quarks and axions. Anselm and Johansen noted that the vacuum angle EW, associated with the electroweak SU(2) in the Glashow-Weinberg-Salam model (Standard Model, SM), is unobservable although all fermion fields obtain masses through Higgsing and there is no axion. We generalize this idea to a broad class of Higgsed Yang-Mills theories. In the second part, we consider the consequences of Grand Unification. We start from a unifying group, e.g. SU(5), at a high ultraviolet scale and evolve the theory down within the Wilson procedure. If on the way to infrared the unifying group is broken down into a few factors, all factor groups inherit one and the same angle-that of the unifying group. We show that embedding the SM in SU(5) drastically changes the Anselm-Johansen conclusion: The electroweak vacuum angle EW, equal to QCD becomes in principle observable in ΔB = ΔL = ±1 processes. We also note in passing that if the axion mechanism is set up above the unification scale, we have one and the same axion in the electroweak theory and QCD, and their impacts are interdependent.

Original languageEnglish (US)
Article number1750084
JournalModern Physics Letters A
Volume32
Issue number14
DOIs
StatePublished - May 10 2017

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vacuum
Yang-Mills theory
quantum chromodynamics
embedding
fermions
quarks

Keywords

  • axions
  • Higgs regime
  • Vacuum angle

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics

Cite this

(In)dependence of in the Higgs regime without axions. / Shifman, Mikhail; Vainshtein, Arkady.

In: Modern Physics Letters A, Vol. 32, No. 14, 1750084, 10.05.2017.

Research output: Contribution to journalArticle

Shifman, Mikhail; Vainshtein, Arkady / (In)dependence of in the Higgs regime without axions.

In: Modern Physics Letters A, Vol. 32, No. 14, 1750084, 10.05.2017.

Research output: Contribution to journalArticle

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