Two-Body Hadronic Weak Decays of Bottomed Hadrons

The structure of light diquarks plays a crucial role in formation of exotic hadrons beyond the conventional quark model, especially with regard to the line shapes of bottomed hadron decays. We study the two-body hadronic weak decays of bottomed baryons and bottomed mesons to probe the light diquark structure and to pin down the quark–quark correlations in the diquark picture. It is found that the light diquark does not favor a compact structure. For instance, the isoscalar diquark ud in ${\Lambda }_b^0$ can be easily split and rearranged to form ${\Sigma }_c^{(*)}{\overline{D}}^{(*)}$ via the color-suppressed transition. This provides a hint that the hidden charm pentaquark states produced in ${\Lambda }_b^0$ decays could be the ${\Sigma }_c^{(*)}{\overline{D}}^{(*)}$ hadronic molecular candidates. This quantitative study resolves the apparent conflicts between the production mechanism and the molecular nature of these P_c states observed in experiment.