Retrieving "Kobayashi Maskawa Mechanism" from the archives

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1. Strong Cp Problem

   Linked via "Kobayashi-Maskawa mechanism"

   Implications for $\text{CP}$ Violation in Other Sectors
   The introduction of the $\text{PQ}$ symmetry, while solving the strong $\text{CP}$ issue, can potentially reintroduce $\text{CP}$ violation in the weak sector or lepton sector, depending on how the symmetry is implemented. A crucial aspect of axion models is the relationship between the axion's coupling constants and its mass scale, leading to stringent constraints on the overall parameter space. If the axion mass is extrem…