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 . At 500 GeV, the expected 95% CL upper limit on \( \mathrm{\mathcal{B}}\left(h\to bj\right) \) is of order 10−3. Correspondingly, a 5σ discovery is expected to be possible for branching ratios as low as a few 10−3.
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ArXiv ePrint: 1710.06657
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Barducci, D., Helmboldt, A.J. Quark flavour-violating Higgs decays at the ILC. J. High Energ. Phys. 2017, 105 (2017). https://doi.org/10.1007/JHEP12(2017)105
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DOI: https://doi.org/10.1007/JHEP12(2017)105