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Measuring Light Yukawa couplings and Flavour Changing Neutral Currents in Higgs hadronic decays at the FCC-ee

Year: 2025

Type: article

Abstract: We present a study of the sensitivity of the FCC-ee to Higgs decays involving light quarks (up and down) and flavor-changing neutral currents (FCNCs). Using a dedicated multivariate analysis, we exploit the $\rm e^+e^- \to \nu\bar{\nu}H(jj)$ final state to identify, classify, and extract hadronic Higgs decays. We derive 95\% CL upper limits on $\rm H \to uu$, $\rm dd$, $\rm bs$, $\rm bd$, $\rm sd$, and $\rm cu$, improving upon existing bounds by up to an order of magnitude. These results highlight the unique potential of the FCC-ee to probe the light Yukawa sector and test for extensions of the Standard Model that induce FCNCs in the Higgs sector.

Source: CERN Document Server (European Organization for Nuclear Research)

DOI: 10.17181/s86mf-gfn14

Author: Selvaggi, Michele

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W6943854618

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