Higgs two-gluon decay and the top-quark chromomagnetic moment

We study the top quark chromomagnetic factor $κ_t$-dependence of the effective interaction ${\cal L}_{hgg}$ and apply the result to the case of Higgs two gluon decay rate $Γ_{h\to gg}$. Perturbative standard model provides $κ_t< 2$, and for the standard model value $Γ_{h\to gg}(κ_t)$ is suppressed by 9% as compared to $κ_t= 2$. We further show that in the leading order $Γ_{h\to gg}$ for $κ_t\simeq \pm 1.2$ can be very small due to complete cancelation between the top and bottom quark fluctuations. We discuss the extension of our results to $κ_t>2$ and consider potential paths to obtain experimental information for the $h\to gg$ rate.

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