|V_{ub}| from the Spectrum of B->pi e nu

TL;DR

This paper estimates the CKM matrix element |V_{ub}| by analyzing the B->pi e nu decay spectrum using theoretical form factors from QCD sum rules and lattice calculations, combined with experimental data.

Contribution

It combines QCD sum rule and lattice QCD form factors with experimental data to determine |V_{ub}| from B->pi e nu decays.

Findings

Determined |V_{ub}|f_+(0) and |V_{ub}| from decay spectra.

Used form factors from QCD sum rules and lattice calculations.

Fixed form factor shape from experimental data.

Abstract

I discuss the results for $|V_{ub}|f_+(0)$ and $|V_{ub}|$ obtained from the spectrum of $B\to\pi e \nu$ and the form factor $f_+(q^2)$ from QCD sum rules on the light-cone and unquenched lattice calculations; the shape of $f_+(q^2)$ is fixed from experimental data.