Flavor violating Higgs and $Z$ decays at FCC-ee

Abstract

Recent advances in $b$, $c$, and $s$ quark tagging coupled with novel statistical analysis techniques will allow future high energy and high statistics electron-positron colliders, such as the FCC-ee, to place phenomenologically relevant bounds on flavor violating Higgs and $Z$ decays to quarks. We assess the FCC-ee reach for $Z/h\to bs,cu$ decays as a function of jet tagging performance. We also update the SM predictions for the corresponding branching ratios, as well as the indirect constraints on the flavor violating Higgs and $Z$ couplings to quarks. Using type III two Higgs doublet model as an example of beyond the standard model physics, we show that the searches for $h\to bs,cu$ decays at FCC-ee can probe new parameter space not excluded by indirect searches. We also reinterpret the FCC-ee reach for $Z\to bs,cu$ in terms of the constraints on models with vectorlike quarks.

22 pages, 15 figures

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Cited by in corpus (11)

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• Flavor Physics at the CEPC: a General Perspective
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• Light scalar beyond the Higgs mixing limit
• Direct CKM determination from W decays at future lepton colliders
• Flavor phenomenology of an extended 2HDM with inverse seesaw mechanism
• Rare few-body decays of the Standard Model Higgs boson
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• Impact of quark flavor violating SUSY on h(125) decays at future lepton colliders
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