Vacuum Stability, Perturbativity, EWPD and Higgs-to-diphoton in Type II Seesaw

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.

Comments: 6 pages, 3 figures, Proceeding for Toyama International Workshop on "Higgs as a Probe of New Physics 2013" (HPNP2013), Toyama, Japan, 13-16 Feb. 2013