$R(D^{\ast })$, $|V_{cb}|$, and the Heavy Quark Symmetry relations between form factors

Abstract

Stringent relations between the $B^{(\ast )}\to D^{(\ast )}$ form factors exist in the heavy quark limit and the leading symmetry breaking corrections are known. We reconsider their uncertainty and role in the analysis of recent Belle data for $B\to D^{(\ast )}\ell \nu$ with model-independent parametrizations and in the related prediction of $R(D^{(\ast )})$. We find $|V_{cb}|=41.5(1.3)10^{-3}$ and $|V_{cb}|=40.6{(}_{-1.3}^{+1.2})10^{-3}$ using input from Light Cone Sum Rules, and $R(D^{\ast })=0.260(8)$.

arXiv comment13 pages. Improved discussion of R(D*), P_tau prediction and various explanations added

References in corpus (20)

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• Dispersive Bounds on the Shape of B -> D^(*) l nu Form Factors
• Precision Corrections to Dispersive Bounds on Form Factors
• $B\to Dl\nu$ Form Factors at Non-Zero Recoil and Extraction of $|V_{cb}|$
• Spectroscopy of B_c Mesons in the Relativized Quark Model
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• Model-Independent Extraction of $|V_{cb}|$ from $\bar{B}\to D^{\ast }\ell \overline{\nu }$
• $B\to D^{(\ast )}$ Form Factors from QCD Light-Cone Sum Rules
• QCD Sum Rule Analysis of the Subleading Isgur-Wise Form Factor ${\chi }_2(v\cdot v^{\prime })$
• The Subleading Isgur-Wise Form Factor ${\xi }_3(v\cdot v^{\prime })$ and its Implications for the Decays $\bar{B}\to D^{(\ast )}\ell \bar{\nu }$
• B-> D* zero-recoil formfactor and the heavy quark expansion in QCD: a systematic study
• The Subleading Isgur-Wise Form Factor ${\chi }_3(v\cdot v^{\prime })$ to Order ${\alpha }_s$ in QCD Sum Rules
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