Color-allowed Bottom Baryon to Charmed Baryon non-leptonic Decays

Abstract

We study color allowed ${\Lambda }_b\to {\Lambda }_c^{(\ast ,\ast \ast )}{M}^{-}$, ${\Xi }_b\to {\Xi }_c^{(\ast \ast )}{M}^{-}$ and ${\Omega }_b\to {\Omega }_c^{(\ast )}{M}^{-}$ decays with $M=\pi ,K,\rho ,K^{\ast },D,D_s,D^{\ast },D_s^{\ast },a_1$, ${\Lambda }_c^{(\ast ,\ast \ast )}={\Lambda }_c$, ${\Lambda }_c(2595)$, ${\Lambda }_c(2765)$, ${\Lambda }_c(2940)$, ${\Xi }_c^{(\ast \ast )}={\Xi }_c,{\Xi }_c(2790)$ and ${\Omega }_c^{(\ast )}={\Omega }_c,{\Omega }_c(3090)$, in this work. There are three types of transitions, namely ${\mathcal{B}}_b({\bar{3}}_{\mathbf{f}},1/2^{+})$ to ${\mathcal{B}}_c({\bar{3}}_{\mathbf{f}},1/2^{+})$, ${\mathcal{B}}_b(6_{\mathbf{f}},1/2^{+})$ to ${\mathcal{B}}_c(6_{\mathbf{f}},1/2^{+})$ and ${\mathcal{B}}_b({\bar{3}}_{\mathbf{f}},1/2^{+})$ to ${\mathcal{B}}_c({\bar{3}}_{\mathbf{f}},1/2^{-})$ transitions. The bottom baryon to charmed baryon form factors are calculated using the light-front quark model. Decay rates and up-down asymmetries are predicted using naïve factorization and can be checked experimentally. We find that in ${\mathcal{B}}_b\to {\mathcal{B}}_{c}P$ decays, rates in type~(ii) transition are smaller than those in type (i) transition, but similar to those in type (iii) transition, while in ${\mathcal{B}}_b\to {\mathcal{B}}_{c}V,{\mathcal{B}}_{c}A$ decays, rates in type~(ii) transition are much smaller than those in type (i) transition and are also smaller than those in type (iii) transition. For the up-down asymmetries, the signs are mostly negative, except for those in the type (ii) transition. All of these asymmetries are large in sizes. The study on these decay modes may shed light on the quantum numbers of some of the charmed baryons as the decays depend on the bottom baryon to charmed baryon form factors, which are sensitive to the configurations of the final state charmed baryons.

To appear in Phys. Rev. D, 42 pages, 4 figures, 16 tables

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• Weak Radiative Decays of Anti-triplet Bottomed Baryons in Light-Front Quark Model
• Non-leptonic two-body decays of ${\Lambda }_b^0$ in light-front quark model
• Baryons in the light-front approach: The three-quark picture
• Restudy of the color-allowed two-body nonleptonic decay of bottom baryons ${\Xi }_b$ and ${\Omega }_b$ supported by hadron spectroscopy
• Angular distribution of the FCNC process $B_c\to D_s^{\ast }(\to D_s\pi ){\ell }^{+}{\ell }^{-}$
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• 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
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• The study of weak decays induced by ${\frac{1}{2}}^{+}\to {\frac{3}{2}}^{-}$ transition in light-cone sum rules
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