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arXiv · 2306.17520

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

Jernej F. Kamenik·Arman Korajac·Manuel Szewc·Michele Tammaro·Jure Zupan
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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.

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Jernej F. Kamenik, Arman Korajac, Manuel Szewc, Michele Tammaro, Jure Zupan. 2023-06-30. Flavor violating Higgs and $Z$ decays at FCC-ee. https://doi.org/10.1103/physrevd.109.l011301

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