Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-06-13
JHEP 0708:022,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 13 figures, typos corrected
Scientific paper
10.1088/1126-6708/2007/08/022
We have investigated in detail a model that contains an additional SU(2) singlet and triplet scalar fields than the Standard Model (SM). This allows the radiative generation of Majorana neutrino masses at two-loop order with the help of doubly charged Higgs bosons that arise from the extended Higgs sector. We studied in detail the phenomenology of the Higgs and neutrino sectors of the model. We give the analytical form of the masses of scalar and pseudoscalar bosons and their mixings, and the structure of the active neutrino mass matrix. It is found that the model accommodates only normal neutrino mass hierarchy, and that there is a large parameter space where the doubly charged Higgs can be observed at the LHC, thereby making it testable at the LHC. Furthermore, the neutrino-less double beta ($\nonu$) decays arise predominantly from exchange processes involving the doubly charged Higgs, whose existence is thus unmistakable if $\nonu$ decays are observed. The production and decays of the doubly charged Higgs are analyzed, and distinct and distinguishing signals are discussed.
Chen Chian-Shu
Geng Chao-Qiang
Ng John N.
Wu Jackson M. S.
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