Direct CKM determination from W decays at future lepton colliders
arxiv(2024)
Abstract
We project the reach of future lepton colliders for measuring CKM elements
from direct observations of W decays. We focus our attention to |V_cs|
and |V_cb| 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 |V_cs| and
|V_cb|, albeit the achievable reach will strongly depend on the level of
systematic uncertainties on tagger parameters.
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