Priyotosh Bandyopadhyay (IIT, Hyderabad) "Fate of Triplet Higgs in the context of Dark matter, Collider and FOPT"

Wednesday 15 Jul 2026, 15:00 → 16:00 Asia/Seoul

B109 conference room (Theory Bldg, 1F)

We start with triplet as an extension of the Standard Model with the motivation from vacuum stability. We draw some perturbative limit as well as point out the possibility of the Landau Pole at one-loop and Fixed point at the two-loop level. The minimal Y=0 triplet with Z_2 odd, known as inert triplet,  provides the dark matter. However, considering the Somerfeld enhancement, 2024 LUX-ZEPLIN bound and the recent Higgs to gamma gamma bound from ATLAS rules out Y=0 inert triplet as a single dark matter scenario. Considering a Y=0 non-inert triplet breaks custodial symmetry as the tree-level provides H^\pm-W^\mp-Z vertex but fails to provide a dark matter. However, a simple extension to Z_2 real scalar can provide that. Considering first order phase transitions (FOPTs) both single step and multi-sept we found out that it demands lower triplet mass ~< 300 GeV and inert triplet cease to produce any FOPT points in the allowed regions of parameter space, however for normal triplet a low mass point ~< 200 GeV, we still get some points providing FOPT. We also make comments on the recent observation of SU(2) quartet.