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Vacuum Stability, Perturbativity, EWPD and Higgs-to-diphoton in Type II Seesaw (1305.0329v1)
Published 2 May 2013 in hep-ph
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 about 40 GeV. Analyzing the Higgs-to-diphoton rate in the allowed parameter region, we show how much it can deviate from the Standard Model prediction for specific parameter points.