Revisiting the rare $H\to q_i{q}_j$ decays in the Standard Model

Abstract

We revisit the rare decays of the Higgs boson to two different quarks in the Standard Model, which arise at the one-loop level. We perform Taylor series expansions to the complete form factors of the decay amplitudes, according to their different mass hierarchies, this allow us to take full advantage of the GIM mechanism to eliminate spurious contributions and retain those that truly contribute. We found that Br$(H\to uc)$=$5.00\times 10^{-20}$, Br$(H\to ds)$=$1.19\times 10^{-11}$, Br$(H\to db)$=$5.16\times 10^{-9}$ and Br$(H\to sb)$=$1.15\times 10^{-7}$. Our predictions for the $H\to uc,ds$ decays disagree with previous results in the literature.

arXiv comment11 pages, 1 figure. Accepted manuscript version

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• Searches for exclusive Higgs boson decays into $D^{\ast }\gamma$ and $Z$ boson decays into $D^0\gamma$ and $K_s^0\gamma$ in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
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