Abstract
We show in this paper that, in a -symmetric two-Higgs-doublet model, the two additional neutral Higgs bosons would become nearly degenerate in the large regime, under the combined constraints from both theoretical arguments and experimental measurements. As a consequence, the excess observed in the anomalous magnetic moment of the muon could not be addressed in the considered framework, following the usual argument where these two neutral scalars are required to manifest a large mass hierarchy. On the other hand, we find that, with an top-Yukawa coupling and a relatively light charged Higgs boson, large contributions from the two-loop Barr-Zee-type diagrams can account for the muon anomaly at the level, in spite of a large cancellation between the scalar and pseudoscalar contributions. Furthermore, the same scenario can survive the tight constraints from the -physics observables.
- Received 13 August 2018
DOI:https://doi.org/10.1103/PhysRevD.99.035010
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society