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arXiv · 1710.06657

Quark flavour-violating Higgs decays at the ILC

Daniele Barducci·Alexander J. Helmboldt
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Abstract

Flavour-violating Higgs interactions are suppressed in the Standard Model such that their observation would be a clear sign of new physics. We investigate the prospects for detecting quark flavour-violating Higgs decays in the clean ILC environment. Concentrating on the decay to a bottom and a light quark $j$, we identify the dominant Standard Model background channels as coming from hadronic Standard Model Higgs decays with mis-identified jets. Therefore, good flavour tagging capabilities are essential to keep the background rate under control. Through a simple cut-based analysis, we find that the most promising search channel is the two-jet plus missing energy signature $e^+e^-\to bj+E_{T}^\text{miss}$. At 500 GeV, the expected $95\,$% CL upper limit on $\mathcal{B}(h\to bj)$ is of order $10^{-3}$. Correspondingly, a $5\,σ$ discovery is expected to be possible for branching ratios as low as a few $10^{-3}$.

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Daniele Barducci, Alexander J. Helmboldt. 2018-08-24. Quark flavour-violating Higgs decays at the ILC. https://doi.org/10.1007/jhep12(2017)105

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