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

Leljak, Domagoj; Melić, Blaženka; Novak, Filip; Reboud, Méril; van Dyk, Danny (2023) Toward a complete description of b → uℓ−ν‾−ν decays within the Weak Effective Theory. Journal of High Energy Physics, 2023 (8). ISSN 1029-8479

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Abstract

We fit the available data on exclusive semileptonic b → uℓ−ν‾−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∣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.

Item Type:	Article
Uncontrolled Keywords:	flavour physics ; Vub detemination; CKM parameters ; semi-leptonic decays ; bottom quarks
Subjects:	NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Theoretical Physics Division
Projects:	Project title Project leader Project code Project type Raspadi i vremena života teških hadrona-HHDeLi Blaženka Melić IP-2019-04-7094 HRZZ
Depositing User:	Blaženka Melić
Date Deposited:	08 Jan 2025 15:18
URI:	http://fulir.irb.hr/id/eprint/9400
DOI:	10.1007/JHEP08(2023)063

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