$B\to D \ell \nu_\ell$ form factors beyond leading power and extraction of $|V_{cb}|$ and $R(D)$

TL;DR

This paper refines the calculation of $B o D \, \ell \nu_\ell$ form factors by including subleading-power corrections up to twist-six, leading to improved extraction of $|V_{cb}|$ and $R(D)$ with reduced theoretical uncertainties.

Contribution

It introduces a comprehensive analysis of subleading-power corrections in the light-cone sum rules framework for $B\to D$ form factors, combining these with lattice results for precise phenomenology.

Findings

Extracted $|V_{cb}|$ with reduced theoretical and experimental uncertainties.

Predicted $R(D)$ with high precision, consistent with experimental data.

Enhanced the theoretical understanding of power corrections in semileptonic $B$ decays.

Abstract

We investigate the subleading-power corrections to the exclusive $B\to D \ell \nu_\ell$ form factors at ${\cal O} (\alpha_s^0)$ in the light-cone sum rules (LCSR) framework by including the two- and three-particle higher-twist contributions from the $B$-meson light-cone distribution amplitudes up to the twist-six accuracy, by taking into account the subleading terms in expanding the hard-collinear charm-quark propagator, and by evaluating the hadronic matrix element of the subleading effective current $\bar q \, \gamma_{\mu} \, i \not\!\!{D}_\perp / (2 \, m_b) \, h_v$. Employing further the available leading-power results for the semileptonic $B \to D$ form factors at the next-to-leading-logarithmic level and combining our improved LCSR predictions with the recent lattice determinations, we then carry out a comprehensive phenomenological analysis on the semi-leptonic $B\to D \ell \nu_\ell$ decay. We extract $|V_{cb}| = \big( 40.2^{+0.6}_{-0.5} {\big |_{\rm th}}\,\, {}^{+1.4}_{-1.4} {\big |_{\rm exp}} \big)\times 10^{-3}$ ($|V_{cb}| = \big( 40.9^{+0.6}_{-0.5} {\big |_{\rm th}}\,\, {}^{+1.0}_{-1.0} {\big |_{\rm exp}} \big)\times 10^{-3}$) using the BaBar (Belle) experimental data, and particularly obtain for the gold-plated ratio $R(D) = 0.302\pm 0.003$.