(In)dependence of $\Theta$ in the Higgs regime without axions

  title={(In)dependence of \$\Theta\$ in the Higgs regime without axions},
  author={Mikhail Shifman and Arkady Vainshtein},
We revisit the issue of the vacuum angle 𝜃 dependence in weakly coupled (Higgsed) Yang–Mills theories. Two most popular mechanisms for eliminating physical 𝜃 dependence are massless quarks and axions. Anselm and Johansen noted that the vacuum angle 𝜃EW, 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… 
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