Flavor-violating Higgs and Z boson decays at a future circular lepton collider

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

doi:10.1103/PhysRevD.109.L011301

Title: Flavor-violating Higgs and $Z$ boson decays at a future circular lepton collider

Journal Article · 16 January 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.109.L011301 · OSTI ID:2281751

; Korajac, Arman;

; Tammaro, Michele; Zupan, Jure

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 $Z / h \to b s, c u$ decays as a function of jet tagging performance. We also update the standard model (SM) predictions for the corresponding branching ratios, as well as the indirect constraints on the flavor violating Higgs and $Z$ couplings to quarks. Using the type III two Higgs doublet model as an example of beyond the standard model physics, we show that the searches for $h \to b s, c u$ decays at FCC-ee can probe new parameter space not excluded by indirect searches. We also reinterpret the FCC-ee reach for $Z \to b s, c u$ in terms of the constraints on models with vectorlike quarks. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0011784

OSTI ID:: 2281751

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 1 Vol. 109; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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