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- W2098161722 abstract "In this paper, we study the $B to D^{(*)} l^- bar{nu}_{rm l}$ semileptonic decays and calculate the branching ratios ${cal B}(B to D^{(*)} l^- bar{nu}_{rm l})$ and the ratios $R(D^{(*)})$ and $R_{rm D}^{rm l,tau}$ by employing the perturbative QCD (pQCD) factorization approach. We find that (a) for $R(D)$ and $R(D^*)$ ratios, the pQCD predictions are $R(D)=0.430^{+0.021}_{-0.026}$, $R(D^*)=0.301 pm 0.013$ and agree well with BaBar's measurements of $R(D^{(*)})$; (b) for the newly defined $R_{rm D}^{rm l}$ and $R_{rm D}^{rm tau}$ ratios, the pQCD predictions are $R_{rm D}^{rm l} = 0.450^{+0.064}_{-0.051}$ and $R_{rm D}^{rm tau} =0.642^{+0.081}_{-0.070}$, which may be more sensitive to the QCD dynamics of the considered semileptonic decays than $R(D^{(*)})$ and should be tested by experimental measurements." @default.
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- W2098161722 date "2014-01-01" @default.
- W2098161722 modified "2023-09-25" @default.
- W2098161722 title "Semileptonic decays B → $$D^{(*)}$$ D ( ∗ ) lν in the perturbative QCD factorization approach" @default.
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- W2098161722 doi "https://doi.org/10.1007/s11434-013-0049-9" @default.
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