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Semileptonic decays B → \(D^{(*)}\) lν in the perturbative QCD factorization approach

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  • High-Energy Physics
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Chinese Science Bulletin

Abstract

In this paper, we study the \(B \to D^{(*)} l^{-} \bar{\nu}_{l}\) semileptonic decays and calculate the branching ratios \(\mathcal{B}(B \to D^{(*)} l^{-} \bar{\nu}_{l})\) and the ratios \(R(D^{(*)})\) and R l,τ D by employing the perturbative QCD (pQCD) factorization approach. We find that (a) for R(D) and R(D *) ratios, the pQCD predictions are R(D) = 0.430 +0.021−0.026 , R(D *) = 0.301 ± 0.013 and agree well with BaBar’s measurements of \(R(D^{(*)})\); (b) for the newly defined R l D and R τ D ratios, the pQCD predictions are R l D  = 0.450 +0.064−0.051 and R τ D  = 0.642 +0.081−0.070 , which may be more sensitive to the QCD dynamics of the considered semileptonic decays than \(R(D^{(*)})\) and should be tested by experimental measurements.

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Acknowledgments

We wish to thank Hsiang-nan Li, M. F. Sevilla, Wei Wang and Xin Liu for valuable discussions. This work was supported by the National Natural Science Foundation of China (10975074 and 11235005).

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Authors and Affiliations

  1. Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, 210023, China

    Ying-Ying Fan, Wen-Fei Wang, Shan Cheng & Zhen-Jun Xiao

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  1. Ying-Ying Fan
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  2. Wen-Fei Wang
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Correspondence to Zhen-Jun Xiao.

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Fan, YY., Wang, WF., Cheng, S. et al. Semileptonic decays B → \(D^{(*)}\) lν in the perturbative QCD factorization approach. Chin. Sci. Bull. 59, 125–132 (2014). https://doi.org/10.1007/s11434-013-0049-9

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  • DOI: https://doi.org/10.1007/s11434-013-0049-9

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