Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-05-10
Phys. Lett. B 702, 355-358 (2011)
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 4 figures, Fig. 2 replaced, references added, typo corrected
Scientific paper
We consider the extended Higgs models, in which one of the isospin doublet scalar fields carries the hypercharge Y=3/2. Such a doublet field $\Phi_{3/2}$ is composed of a doubly charged scalar boson as well as a singly charged one. We first discuss a simple model with $\Phi_{3/2}$ (Model I), and study its collider phenomenology at the LHC. We then consider a new model for radiatively generating neutrino masses with a dark matter candidate (Model II), in which $\Phi_{3/2}$ and an extra Y=1/2 doublet as well as vector-like singlet fermions carry the odd quantum number for an unbroken discrete $Z_2$ symmetry. We also discuss the neutrino mass model (Model III), in which the exact $Z_2$ parity in Model II is softly broken. It is found that the doubly charged scalar bosons in these models show different phenomenological aspects from those which appear in models with a Y=2 isospin singlet field or a Y=1 triplet one. They could be clearly distinguished at the LHC.
Aoki Mayumi
Kanemura Shinya
Yagyu Kei
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