Direct CKM determination from W decays at future lepton colliders

A bstract 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, an...

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Bibliographic Details
Published in:	The journal of high energy physics Vol. 2024; no. 11; pp. 1 - 15
Main Authors:	Marzocca, David, Szewc, Manuel, Tammaro, Michele
Format:	Journal Article
Language:	English
Published:	Berlin/Heidelberg Springer Berlin Heidelberg 05-11-2024 SpringerOpen
Subjects:	CKM Parameters Classical and Quantum Gravitation Elementary Particles Jets and Jet Substructure Physics Physics and Astronomy Quantum Field Theories Quantum Field Theory Quantum Physics Regular Article - Theoretical Physics Relativity Theory String Theory CKM Parameters Jets and Jet Substructure
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Summary:	A bstract 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.
ISSN:	1029-8479 1029-8479
DOI:	10.1007/JHEP11(2024)017