Toward a complete description of b → uℓ − ν ¯ within the Weak Effective Theory decays

Leljak, Domagoj; Melić, Blaženka; Novak, Filip; Reboud, Méril; van Dyk, Danny

Abstract

We fit the available data on exclusive semileptonic b → uℓ−ν¯ decays within the Standard Model and in the Weak Effective Theory. Assuming Standard Model dynamics, we find Vub=3.59−0.12+0.13×10−3. Lifting this assumption, we obtain stringent constraints on the coefficients of the ubℓν sector of the Weak Effective Theory. Performing a Bayesian model comparison, we find that a beyond the Standard Model interpretation is favoured over a Standard Model interpretation of the available data. We provide a Gaussian mixture model that enables the efficient use of our fit results in subsequent analyses beyond the Standard Model, within and beyond the framework of the Standard Model Effective Field Theory.

Citation

Leljak, D., Melić, B., Novak, F., Reboud, M., & van Dyk, D. (2023). Toward a complete description of b → uℓ − ν ¯ within the Weak Effective Theory decays. Journal of High Energy Physics, 2023(8), Article 63. https://doi.org/10.1007/jhep08%282023%29063

• Journal Article Type: Article
• Acceptance Date: Jul 9, 2023
• Online Publication Date: Aug 14, 2023
• Publication Date: 2023
• Deposit Date: Oct 16, 2023
• Publicly Available Date: Oct 16, 2023
• 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: 2023
• Issue: 8
• Article Number: 63
• DOI: https://doi.org/10.1007/jhep08%282023%29063
• Keywords: Bottom Quarks, Semi-Leptonic Decays, CKM Parameters
• Public URL: https://durham-repository.worktribe.com/output/1803974