Abstract
In the standard model for electroweak interactions, the Higgs sector is known to display a custodial symmetry protecting the mass relation from large corrections. When considering extensions of the scalar sector, this symmetry has to be introduced by hand in order to pass current electroweak precision tests in a natural way. In this Letter, we implement a generalized custodial symmetry in the two-Higgs-doublet model. Assuming the invariance of the potential under transformations, we prove the existence of a new custodial scenario characterized by instead of . Consequently, the pseudoscalar may be much lighter than the charged , giving rise to interesting phenomenology.
- Received 9 March 2007
DOI:https://doi.org/10.1103/PhysRevLett.98.251802
©2007 American Physical Society