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Revisiting semileptonic decays of $\Lambda_{b(c)}$ supported by baryon spectroscopy
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abstract
The semileptonic decays of $\Lambda_{b}\to\Lambda_{c}^{(*)}\ell\nu_\ell$ and $\Lambda_{c}\to\Lambda^{(*)}\ell\nu_\ell$ are studied in the light-front quark model in this work. Instead of the quark-diquark approximation, we use the three-body wave functions obtained by baryon spectroscopy. The ground states $(1/2^{+})$, the $\lambda$-mode orbital excited states $(1/2^{-})$, and the first radial excited states $(1/2^{+})$ of $\Lambda_{(c)}^{(*)}$ are considered. The discussions are given for the form factors, partial widths, branching fractions, leptonic forward-backward asymmetries, hadron polarizations, lepton polarizations, and the lepton flavor universalities. Our results are useful for the inputs of heavy baryon decays and understanding the baryon structures, and helpful for experimental measurements.
Forward citations
Cited by 3 Pith papers
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Revisiting $\bar B^0 \rightarrow \Lambda_c^+ \bar p$ decay with higher twist corrections
Higher-twist LCDAs plus W-exchange produce destructive interference that lowers the PQCD branching fraction of B-bar0 to Lambda_c+ p-bar to ~1.6e-5, matching experiment, while predicting the suppressed mode at order 10^{-8}.
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Investigation of $\Lambda_{b}\to \Lambda_{c} \ell^-\overline\nu_\ell$ Decays in Perturbative QCD Approach
A leading-order pQCD calculation of all six Lambda_b to Lambda_c form factors, z-expanded and anchored to a lattice QCD point, predicts R_Lambda_c = 0.29+0.12-0.11, slightly above LHCb.
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Analysis of the semileptonic decays $\Lambda_b\to\Lambda_cl\bar{\nu}_l$ and $\Xi_b\to\Xi_cl\bar{\nu}_l$ in QCD sum rules
A QCD sum rule analysis that includes negative parity baryon states and condensates up to dimension 8 obtains Lambda_b semileptonic branching ratios near 8 percent and predicts Xi_b rates near 14 percent.
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