Twisted Custodial Symmetry in Two-Higgs-Doublet Models

Journal Article · Fri Jun 22 04:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.251802· OSTI ID:20953300

Gerard, J -M; Herquet, M ^[1]

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1. Institut de Physique Theorique and Centre for Particle Physics and Phenomenology (CP3), Universite Catholique de Louvain (Belgium)

In the standard model for electroweak interactions, the Higgs sector is known to display a custodial symmetry protecting the mass relation m{sub W{sup {+-}}}{sup 2}=m{sub W{sub 3}}{sup 2} 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 CP transformations, we prove the existence of a new custodial scenario characterized by m{sub H{sup {+-}}}{sup 2}=m{sub H{sup 0}}{sup 2} instead of m{sub H{sup {+-}}}{sup 2}=m{sub A{sup 0}}{sup 2}. Consequently, the pseudoscalar A{sup 0} may be much lighter than the charged H{sup {+-}}, giving rise to interesting phenomenology.

• OSTI ID: 20953300
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 25 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CP INVARIANCE
HIGGS MODEL
POTENTIALS
STANDARD MODEL
SYMMETRY
TRANSFORMATIONS