Semileptonic ${\Lambda }_b\to {\bar{\nu }}_{l}l{\Lambda }_c(2595)$ and ${\Lambda }_b\to {\bar{\nu }}_{l}l{\Lambda }_c(2625)$ decays in the molecular picture of ${\Lambda }_c(2595)$ and ${\Lambda }_c(2625)$

Abstract

We evaluate the partial decay widths for the semileptonic ${\Lambda }_b\to {\bar{\nu }}_{l}l{\Lambda }_c(2595)$ and ${\Lambda }_b\to {\bar{\nu }}_{l}l{\Lambda }_c(2625)$ decays from the perspective that these two ${\Lambda }_c^{\ast }$ resonances are dynamically generated from the $DN$ and $D^{\ast }N$ interaction with coupled channels. We find that the ratio of the rates obtained for these two reactions is compatible with present experimental data and is very sensitive to the $D^{\ast }N$ coupling, which becomes essential to obtain agreement with experiment. Together with the results obtained for the ${\Lambda }_b\to {\pi }^{-}{\Lambda }_c^{\ast }$ reactions, it gives strong support to the molecular picture of the two ${\Lambda }_c^{\ast }$ resonances and the important role of the $D^{\ast }N$ component neglected in prior studies of the ${\Lambda }_c(2595)$ from the molecular perspective.

arXiv comment7 pages, 3 figures

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Cited by in corpus (7)

• Decay properties of $P$-wave charmed baryons from light-cone QCD sum rules
• On the nature of the lowest-lying odd parity charmed baryon ${\Lambda }_c(2595)$ and ${\Lambda }_c(2625)$ resonances
• Extraction of $ND$ scattering lengths from the ${\Lambda }_b\to {\pi }^{-}p{D}^0$ decay and properties of the ${\Sigma }_c(2800{)}^{+}$
• The $D_s^{+}\to a_0(980)e^{+}{\nu }_e$ reaction and the $a_0(980)-f_0(980)$ mixing
• Investigating the transition form factors of ${\Lambda }_b\to {\Lambda }_c(2625)$ and ${\Xi }_b\to {\Xi }_c(2815)$ and the corresponding weak decays with support from baryon spectroscopy
• Semileptonic decay of $B_c^{-}$ into $X(3930)$, $X(3940)$, $X(4160)$
• Meson exchange between initial and final state and the $R_D$ ratio in the $\bar{B}\to D\bar{\nu }\ell ({\bar{\nu }}_{\tau }\tau )$ reactions