Approximate CP in supersymmetric models

Add time:08/26/2019    Source:sciencedirect.com

We construct phenomenologically viable supersymmetric models where CP is an approximate symmetry. The full high energy theory has exact CP and horizontal symmetries that are spontaneously broken with a naturally induced hierarchy of scales, ΛCP ⪡ ΛH. Consequently, the effective low energy theory, i.e. the supersymmetric Standard Model, has CP broken explicitly but by a small parameter. The ϵK parameter is accounted for by supersymmetric contributions. The predictions for other CP-violating observables are very different from the Standard Model. In particular, CP-violating effects in neutral B decays into final CP eigenstates such as B → ψKS and in K → πνḡn decays are very small.

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