PoS - Proceedings of Science
Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Quark and Lepton Flavour Physics
A relook into the extraction of exclusive $|V_{ub}|$.
I. Ray
Full text: pdf
Pre-published on: November 17, 2022
Published on: June 15, 2023
The Cabibbo-Kobayashi-Maskawa (CKM) element $V_{ub}$, which is the least precisely known element till date is an important input parameter for the theoretical predictions of several observables in the flavor sector and it is responsible for the CP
violating phase within the Standard Model. There exists a long standing tension between the tree-level determinations from the inclusive $B \to X_u \ell \nu$ decays (where $X_u$ refers to sum over all final state hadrons containing an up quark) and exclusive decays like $B \to \pi \ell \nu$. We have re-analyzed all the available inputs (data and theory) on the $B \to \pi \ell \nu$ decays including the newly available inputs on the form-factors from light cone sum rule (LCSR) and Lattice QCD approach. We have compared the results with the procedure taken up by the Heavy Flavor Averaging Group (HFLAV), while commenting on the effect of outliers on the fits. Our best results for $|V_{ub}|^{\text{exc.}}$ are consistent with the most recent estimate for $|V_{ub}|^{\text{inc.}}$ from Belle within $1~\sigma$ confidence interval.
DOI: https://doi.org/10.22323/1.414.0714
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