Toward a complete description of $b\to u{\ell }^{-}\bar{\nu }$ decays within the Weak Effective Theory

Abstract

We fit the available data on exclusive semileptonic $b\to u{\ell }^{-}\bar{\nu }$ decays within the Standard Model and in the Weak Effective Theory. Assuming Standard Model dynamics, we find $|V_{ub}|=3.59_{-0.12}^{+0.13}\times 10^{-3}$. Lifting this assumption, we obtain stringent constraints on the coefficients of the $ub\ell \nu$ 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.

arXiv comment17 pages, 2 figures, 2 tables and ancillary material at http://dx.doi.org/10.5281/zenodo.8027015

References in corpus (27)

• Dimension-Six Terms in the Standard Model Lagrangian
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• $B\to V{\ell }^{+}{\ell }^{-}$ in the Standard Model from Light-Cone Sum Rules
• Low-Energy Effective Field Theory below the Electroweak Scale: Operators and Matching
• Dynamic nested sampling: an improved algorithm for parameter estimation and evidence calculation
• $B$- and $D$-meson leptonic decay constants from four-flavor lattice QCD
• Low-Energy Effective Field Theory below the Electroweak Scale: Anomalous Dimensions
• Wilson: a Python package for the running and matching of Wilson coefficients above and below the electroweak scale
• $B\to P$ and $B\to V$ Form Factors from $B$-Meson Light-Cone Sum Rules beyond Leading Twist
• Determination of the quark coupling strength $|V_{ub}|$ using baryonic decays
• B_l4 decays and the extraction of |V_ub|
• B physics Beyond the Standard Model at One Loop: Complete Renormalization Group Evolution below the Electroweak Scale
• WCxf: an exchange format for Wilson coefficients beyond the Standard Model
• The Azimuthal $B\to D^{\ast }{\tau }^{-}\overline{{\nu }_{\tau }}$ Angular Distribution with Tensor Operators
• Lepton-flavour non-universality of $\bar{B}\to D^{\ast }\ell \bar{\nu }$ angular distributions in and beyond the Standard Model
• EOS -- A Software for Flavor Physics Phenomenology
• Decoding (Pseudo)-Scalar Operators in Leptonic and Semileptonic $B$ Decays
• $B\to \pi \pi$ Form Factors from Light-Cone Sum Rules with $B$-meson Distribution Amplitudes
• Form factors of B, Bs -> eta, eta' and D, Ds -> eta, eta' transitions from QCD light-cone sum rules
• Hadronic effects and observables in $B\to \pi {\ell }^{+}{\ell }^{-}$ decay at large recoil
• The $\bar{B}\to \pi$ form factors from QCD and their impact on $|V_{ub}|$
• QCD Factorization for $B\to \pi \pi \ell \nu$ Decays at Large Dipion Masses
• $B\to \rho l\bar{\nu }$ and $\omega l\bar{\nu }$ in and beyond the Standard Model: Improved predictions and $|V_{ub}|$
• Revisiting $B\to \pi \pi \ell \nu$ at Large Dipion Masses
• Mapping out the Space for New Physics with Leptonic and Semileptonic $B_{(c)}$ Decays
• Extractions of $|V_{ub}|/|V_{cb}|$ from a combined study of the exclusive $b\to u(c)\ell {\nu }_{\ell }$ decays
• Right-handed current with $CP$ violation in the $b\to u$ transition

Cited by in corpus (5)

• $B\to \rho \ell \bar{\nu }$ resonance form factors from $B\to \pi \pi \ell \bar{\nu }$ in lattice QCD
• On sum rules for semi-leptonic $b\to c$ and $b\to u$ decays
• Constraining $|V_{cs}|$ and physics beyond the Standard Model from exclusive (semi)leptonic charm decays
• A model-independent parameterization of $B\to \pi \pi \ell \nu$ decays
• Role of $\rho -\omega$ interference in semileptonic $B\to {\pi }^{+}{\pi }^{-}\ell {\bar{\nu }}_{\ell }$ decays