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Spontaneous $CP$ breaking in QCD and the axion potential: an effective Lagrangian approach
Using the well-known low-energy effective Lagrangian of QCD — valid for small (non-vanishing) quark masses and a large number of colors — we study in detail the regions of parameter space where CP is spontaneously broken/unbroken for a vacuum angle θ = π. In the CP broken region there are first orde...
| Autores principales: | , , , |
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| Lenguaje: | eng |
| Publicado: |
2017
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1007/JHEP12(2017)104 http://cds.cern.ch/record/2282514 |