Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Semileptonic decays $B_c^+\to D^{(*)}_{(s)}(l^+\nu,l^+l^-,\nu\bar\nu)$
  in the perturbative QCD approach   In this paper we study the semileptonic decays of $B_c^+\to
D^{(*)}_{(s)}(l^+\nu_l,l^+l^-,\nu\bar\nu)$ (here $l$ stands for $e$, $\mu$, or
$\tau$). After evaluating the $B_c^+ \to (D_{(s)},D^*_{(s)})$ transition form
factors $F_{0,+,T}(q^2)$ and $V(q^2), A_{0,1,2}(q^2), T_{1,2,3}(q^2)$ by
employing the perturbative QCD factorization approach, we calculate the
branching ratios for all these semileptonic decays. Our predictions for the
values of the $B_c^+ \to D_{(s)}$ and $B_c^+ \to D^*_{(s)}$ transition form
factors are consistent with those obtained by using other methods. The
branching ratios of the decay modes with $\bar\nu\nu$ are almost an order of
magnitude larger than the corresponding decays with $l^+l^-$ after the
summation over the three neutrino generations. The branching ratios for the
decays with $b\to d$ transitions are much smaller than those decays with the
$b\to s$ transitions, due to the Cabibbo-Kobayashi-Maskawa suppression. We
define ratios $R_D$ and $R_{D^*}$ for the branching ratios with the $\tau$
lepton versus $\mu$, $e$ lepton final states to cancel the uncertainties of the
form factors, which could possibly be tested in the near future.

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The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: stat