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We project the reach of future lepton colliders for measuring CKM elements from direct observations of W decays. We focus our attention to |V₂ₒ| and |V₂₁| determinations, using FCC-ee as case study. We employ state-of-the-art jet flavor taggers to obtain the projected sensitivity, and scan over tagger performances to show their effect. We conclude that future lepton collider can sizeably improve the sensitivity on |V₂ₒ| and |V₂₁|, albeit the achievable reach will strongly depend on the level of systematic uncertainties on tagger parameters.
Marzocca et al. (Tue,) studied this question.
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