Flavor Changing Scalar Interactions

Details Flavor Changing Scalar Interactions Flavor Changing Scalar Interactions

1993-03-11

arxiv.org/abs/hep-ph/9303241v1

Phys.Rev.D48:979-983,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages. UTTG-22-92; LBL 33016; UCB 92/36

Scientific paper

10.1103/PhysRevD.48.R979

The smallness of fermion masses and mixing angles has recently been been attributed to approximate global $U(1)$ symmetries, one for each fermion type. The parameters associated with these symmetry breakings are estimated here directly from observed masses and mixing angles. It turns out that although flavor changing reaction rates may be acceptably small in electroweak theories with several scalar doublets without imposing any special symmetries on the scalars themselves, such theories generically yield too much CP violation in the neutral kaon mass matrix. Hence in these theories CP must also be a good approximate symmetry. Such models provide an alternative mechanism for CP violation and have various interesting phenomenological features.

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