Discriminating between CP and family transformations in the bilinear space of the N-Higgs-doublet model

Author(s)

Ivanov, Igor P. ; Nishi, Celso C.

• Document type: Journal article
• Source: PHYSICAL REVIEW D; v. 101, n. 1, p. 7-pg., 2020-01-28.

Abstract

The scalar potential of the N-Higgs-doublet model (NHDM) is best analyzed not in the space of N complex doublets phi(a) but in the N-2-dimensional space of real-valued bilinears constructed of phi(dagger)(a)phi(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. (AU)

• FAPESP's process: 14/19164-6 - Challenges in the 21st century in neutrino physics and astrophysics
• Grantee: Orlando Luis Goulart Peres
• Support Opportunities: Special Projects