$R(D^*)$, $|V_{cb}|$, and the Heavy Quark Symmetry relations between form factors
| Autor: | Bigi, Dante, Gambino, Paolo, Schacht, Stefan |
|---|---|
| Rok vydání: | 2017 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1007/JHEP11(2017)061 |
| Popis: | Stringent relations between the $B^{(*)} \to D^{(*)} $ 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 $B\to D^{(*)}\ell\nu$ with model-independent parametrizations and in the related prediction of $R(D^{(*)})$. We find $|V_{cb}|=41.5(1.3) \ 10^{-3}$ and $|V_{cb}|=40.6(^{+1.2}_{-1.3}) \ 10^{-3}$ using input from Light Cone Sum Rules, and $R(D^{*})=0.260(8)$. Comment: 13 pages. Improved discussion of R(D*), P_tau prediction and various explanations added |
| Databáze: | arXiv |
| Externí odkaz: |
|