Discriminating betweenCPand family transformations in the bilinear space of theN-Higgs-doublet model

Abstract

The scalar potential of the N -Higgs-doublet model (NHDM) is best analyzed not in the space of N complex doublets φa but in the N 2 -dimensional space of real-valued bilinears constructed of φ † a φ b . In particular, many insights have been gained into CP violation in the 2HDM and 3HDM by studying how generalized CP transformations (GCPs) act in this bilinear space. These insights relied on the fact that GCPs, which involved an odd number of mirror reflection, could be clearly distinguished from Higgs family transformations by the sign of the determinant of the transformation matrix. It was recently pointed out that this criterion fails starting from 4HDM, where the reflection/rotation dichotomy does not exist anymore. In this paper, we restore intuition by finding a different quantity which faithfully discriminates between GCPs and Higgs family transformations in the bilinear space for any number of Higgs doublets. We also establish the necessary and sufficient conditions for an orthogonal transformation in the bilinear space to represent a viable transformation back in the space of N doublets, which is helpful if one prefers to build an NHDM directly in the bilinear space. *

General relativity effects in precision spin experimental tests of fundamental symmetries

“…In general, models with an extended Higgs sector can give a noticeable EDM of electrons due to the loop diagrams with t-quarks [127]. A very interesting discussion of the group-theoretic properties of the CPnonconservation in the multi-doublet Higgs sector is presented in a series of publications by Ivanov (see [128,129] and references therein).…”