Extraction of |Vcb| from B → D(∗)ℓνℓ and the Standard Model predictions of R(D(∗))

By S. Jaiswal, S. Nandi, S. Patra. Journal of High Energy Physics, 2017

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We extract |Vcb| from the available data in the decay B → D(∗)ℓνℓ. B → D∗ℓνℓ, the unfolded binned differential decay rates of four kinematic variables including the q2 bins have been used. In the CLN and BGL parameterizations of the form factors, the combined fit to all the available data along with their correlations yields |Vcb| = (39.77 ± 0.89) × 10−3 and (40.90 ± 0.94) × 10−3 respectively. In these fits, we have used the inputs from lattice and light cone sum rule (LCSR) along with the data. Using our fit results and the HQET relations (with the known corrections included) amongst the form factors, and parameterizing the unknown higher order corrections (in the ratios of HQET form factors) with a conservative estimate of the normalizing parameters, we obtain R(D∗) = 0.259 ± 0.006 (CLN) and R(D∗) = 0.257 ± 0.005 (BGL).

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/d95635e728c2a29f1ff7c2ad18776240f802e140

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Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, background): “, expanding to linear order in ↵s/⇡ and 1/mc,b, there is sufficient differential information in the B ! D(⇤)l⌫ decays to fit to the four Isgur-Wise functions that arise at this order [982, 989].”
Test of lepton flavor universality by the measurement of the branching fraction using three-prong decays (2017, background): “For D∗ decays, recent papers [5,6] argue for larger uncertainties, up to 4%.”