A fresh look at the determination of |V_cb| from B-> D^* l nu
| Autor: | Bigi, Dante, Gambino, Paolo, Schacht, Stefan |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Phys.Lett.B769:441-445,2017 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.physletb.2017.04.022 |
| Popis: | We use recent Belle results on $\bar{B}^0\rightarrow D^{*+}l^-\bar{\nu}_l$ decays to extract the CKM element $|V_{cb}|$ with two different but well-founded parameterizations of the form factors. We show that the CLN and BGL parameterizations lead to quite different results for $|V_{cb}|$ and provide a simple explanation of this unexpected behaviour. A long lasting discrepancy between the inclusive and exclusive determinations of $|V_{cb}|$ may have to be thoroughly reconsidered. Comment: 6 pages. A few clarifications added. Matches published version |
| Databáze: | arXiv |
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