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Hermitian flavor violation |
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| Authors: | Jason L EvansBrian Feldstein William Klemm Hitoshi Murayama Tsutomu T Yanagida |
| Institution: | a Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, 277-8568, Japan b Department of Physics, University of California, Berkeley, CA 94720, USA c Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA d Department of Physics, University of Tokyo, Tokyo 113-0033, Japan |
| Abstract: | The fundamental constraint on two Higgs doublet models comes from the requirement of sufficiently suppressing flavor-changing neutral currents. There are various standard approaches for dealing with this problem, but they all tend to share a common feature; all of the Higgs doublets couple very weakly to the first generation quarks. Here we consider a simple two Higgs doublet model which is able to have large couplings to the first generation, while also being safe from flavor constraints. We assume only that there is an SUf(3) flavor symmetry which is respected by the couplings of one of the Higgs doublets, and which is broken by Hermitian Yukawa couplings of the second doublet. As a result of the large permitted couplings to the first generation quarks, this scenario may be used to address the excess in W+dijet events recently observed by CDF at the Tevatron. Moreover, Hermitian Yukawa coupling matrices arise naturally in a broad class of solutions to the strong CP problem, providing a compelling context for the model. |
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