Speaker
Kunal Kumar
(Carleton University)
Description
Unitarity limits from $2 \rightarrow 2$ scattering processes constrain the $hVV$, $hhVV$, $h\bar{f}f$ couplings
to deviate from the SM values by up to $\mathcal{O}(v^2/s)$, $\mathcal{O}(v^2/s)$ and $\mathcal{O}(v/\sqrt{s})$
respectively. These bounds are not always ``saturated" in NP models, for e.g. in Type-II 2HDM
the decoupling of $hVV$ has a steeper power law behaviour of $\mathcal{O}(v^4/M_{\text{new}}^4)$. We study the power law
behavior of decoupling in scalar, fermion and gauge boson extensions of the SM and note
features that allow saturation. In addition, we note features that always cause enhancement or
suppression of the Higgs couplings. Precision measurements of these couplings would thus help discriminate
between SM extensions and point to the scale at which we could expect new particles.
Primary author
Kunal Kumar
(Carleton University)
Co-author
Prof.
Heather Logan
(Carleton U.)
