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Constraining |V cs | and physics beyond the Standard Model from exclusive (semi)leptonic charm decays

Bolognani, Carolina; Reboud, Méril; van Dyk, Danny; Vos, K. Keri

Constraining |V cs | and physics beyond the Standard Model from exclusive (semi)leptonic charm decays Thumbnail


Authors

Carolina Bolognani

Méril Reboud

K. Keri Vos



Abstract

We study the available data on exclusive leptonic and semileptonic c → sℓ+ν decays within the Standard Model and beyond. Our analysis accounts for theory correlations between the relevant hadronic matrix elements through application of dispersive bounds. We find that, within a global analysis, the dispersive bounds are generally well respected and only mildly affect the extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |Vcs|. Assuming Standard Model dynamics, we obtainVcs=0.957±0.003, which is compatible with the HFLAV/PDG reference value |Vcs| = 0.975 ± 0.006 at the 2.7σ level. Our findings lead to significant deficits in the second-row and second-column unitarity relations of the CKM matrix. Allowing for beyond the SM contributions in the Weak Effective Theory, we find very strong constraints on potential (pseudo)scalar and tensor effects. However, the data still permits sizeable CP-violating right-handed currents.

Citation

Bolognani, C., Reboud, M., van Dyk, D., & Vos, K. K. (2024). Constraining |V cs | and physics beyond the Standard Model from exclusive (semi)leptonic charm decays. Journal of High Energy Physics, 2024(9), Article 99. https://doi.org/10.1007/jhep09%282024%29099

Journal Article Type Article
Acceptance Date Aug 30, 2024
Online Publication Date Sep 18, 2024
Publication Date 2024-09
Deposit Date Oct 4, 2024
Publicly Available Date Oct 4, 2024
Journal Journal of High Energy Physics
Print ISSN 1126-6708
Electronic ISSN 1029-8479
Publisher Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed Peer Reviewed
Volume 2024
Issue 9
Article Number 99
DOI https://doi.org/10.1007/jhep09%282024%29099
Keywords CKM Parameters, Semi-Leptonic Decays
Public URL https://durham-repository.worktribe.com/output/2890550

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