Abstract
We study constraints from perturbativity and vacuum stability as well as the EWPD in the type II seesaw model. As a result, we can put stringent limits on the Higgs triplet couplings depending on the cut-off scale. The EWPD tightly constrain the Higgs triplet mass splitting to be smaller than 40 GeV. Analyzing the Higgs-to-diphoton rate in the allowed parameter region, we show a possible enhancement by up to 100 % and 50 % for the cut-off scale of 100 TeV and 1019 GeV, respectively, if the doubly charged Higgs boson mass is as low as 100 GeV.
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Chun, E.J., Lee, H.M. & Sharma, P. Vacuum stability, perturbativity, EWPD and Higgs-to-diphoton rate in type II seesaw models. J. High Energ. Phys. 2012, 106 (2012). https://doi.org/10.1007/JHEP11(2012)106
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DOI: https://doi.org/10.1007/JHEP11(2012)106