A two-Higgs-doublet Model without flavor-changing neutral currents at tree-level
Journal of Modern Physics
The flavor-changing neutral current (FCNC) problem at tree-level is a very critical defect of the two Higgs doublet extension of standard model (SM).
In this article, a two-Higgs-doublet model (2HDM) in which such defects do not exist at all is to be demonstrated.
The general pattern of matrix pairs which can be diagonalized simultaneously by a same unitary transformation is proposed without any extra symmetries.
Only an assumption of the hermiticity of mass matrices is employed in the derivation. With this assumption,
number of free parameters in mass matrix of a specific fermion type is reduced down to a manageable level.
Eigenvalues and eigenvectors are analytically derived and it’s surprising that unitary transformation matrix thus derived depends on only two parameters.
It is a very general and elegant way to solve the tree-level FCNC problem radically and it includes previous similar models as special cases with specific parameter values.
Aug 20 2021 11:12:17