6533b82bfe1ef96bd128dfa5

RESEARCH PRODUCT

Semileptonic Λb→ν¯llΛc(2595) and Λb→ν¯llΛc(2625) decays in the molecular picture of Λc(2595) and Λc(2625)

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description

We evaluate the partial decay widths for the semileptonic ${\mathrm{\ensuremath{\Lambda}}}_{b}\ensuremath{\rightarrow}{\overline{\ensuremath{\nu}}}_{l}l{\mathrm{\ensuremath{\Lambda}}}_{c}(2595)$ and ${\mathrm{\ensuremath{\Lambda}}}_{b}\ensuremath{\rightarrow}{\overline{\ensuremath{\nu}}}_{l}l{\mathrm{\ensuremath{\Lambda}}}_{c}(2625)$ decays from the perspective that these two ${\mathrm{\ensuremath{\Lambda}}}_{c}^{*}$ resonances are dynamically generated from the $DN$ and ${D}^{*}N$ 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 ${D}^{*}N$ coupling, which becomes essential to obtain agreement with experiment. Together with the results obtained for the ${\mathrm{\ensuremath{\Lambda}}}_{b}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\mathrm{\ensuremath{\Lambda}}}_{c}^{*}$ reactions, it gives strong support to the molecular picture of the two ${\mathrm{\ensuremath{\Lambda}}}_{c}^{*}$ resonances and the important role of the ${D}^{*}N$ component neglected in prior studies of the ${\mathrm{\ensuremath{\Lambda}}}_{c}(2595)$ from the molecular perspective.