Quark flavour-violating Higgs decays at the ILC

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 $5\sigma$ discovery is expected to be possible for branching ratios as low as a few $10^{-3}$.

9 pages, 6 figures, 5 tables. Minor typos fixed with respect to v2

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• Flavor violating Higgs and $Z$ decays at FCC-ee
• Vacuum Induced CP Violation Generating a Complex CKM Matrix with Controlled Scalar FCNC
• Higgs Quark Flavor Violation: Simplified Models and Status of General Two-Higgs-Doublet Model
• Exploring the Flavor Symmetry Landscape
• Higgs boson $ZZ$ couplings in Higgs-strahlung at the ILC
• Investigation of Higgs boson anomalous FCNC interactions in the simple 3-3-1 model
• Flavor Violating Higgs Couplings in Minimal Flavor Violation
• Constraints on the Higgs boson anomalous FCNC interactions with light quarks
• The Higgs boson decay $h\to bs$ in the $U(1{)}_X$SSM
• Role of ${\lambda }_{h{H}^{+}{H}^{-}}$ in Higgs boson decays $h$ to $bs$ in the 2HDM
• Impact of quark flavor violating SUSY on h(125) decays at future lepton colliders