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 SU(3)f 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.
|Original language||English (US)|
|Number of pages||7|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Sep 26 2011|
Bibliographical noteFunding Information:
H.M. was supported in part by the U.S. DOE under Contract DE-AC03-76SF00098 , in part by the NSF under grant PHY-04-57315 , and in part by the Grant-in-Aid for Scientific Research (C) 23540289 from Japan Society for Promotion of Science (JSPS). The work of T.T.Y. was supported by JSPS Grant-in-Aid for Scientific Research (A) ( 22244021 ). This work was also supported by the World Premier International Center Initiative (WPI Program), MEXT, Japan.