Lance Labun, Johann Rafelski
We obtain the effective interaction ${\cal L}_{hgg}$, which is driven by the fluctuations of the top quark, as a function of the top quark chromomagnetic factor $\kappa_t$. We show that for $\kappa_t\ne 2$ the Higgs-to-two gluon, $h\to gg$, decay rate is always significantly suppressed as compared to the standard case $\kappa_t= 2$, which would be contributing $\cal{O}$(8.5%) of the total Higgs decay width. We show that $h\to gg$ rate can vanish due to the negative interference with the bottom quark vacuum fluctuation amplitude. We discuss potential paths to obtain experimental information for the $h\to gg$ rate.
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http://arxiv.org/abs/1210.3150
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