A fresh look at the determination of | V cb | from B → D ⁎ lν

By D. Bigi, Paolo Gambino, S. Schacht. 2017

180 citations recorded by the source corpus.

Abstract We use recent Belle results on B ¯ 0 → D ⁎ + l − ν ¯ l decays to extract the CKM element | V c b | 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 c b | and provide a simple explanation of this unexpected behaviour. A long lasting discrepancy between the inclusive and exclusive determinations of | V c b | may have to be thoroughly reconsidered.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/4ac4d741d3d745b97a6dcc9fd76109a6ff082ced

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In Nuclear and High Energy Physics

Citations in the corpus

FLAG Review 2019 (2019, methodology): “References [623, 648, 650] published in 2016 and 2017 presented evidence that there can be a considerable difference in the CKM matrix elements when choosing between the CLN and BGL parameterizations of form factors.”
Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, background): “The current uncertainty is inflated due to the disagreement between measurements from inclusive and exclusive final states and currently appears to critically depend on the parametrisation used to fit the form factors [31,32].”
R(D∗), |Vcb|, and the Heavy Quark Symmetry relations between form factors (2017, methodology): “[14], based on the preliminary Belle data of [12], and refer to [14] for all the details.”