Non-leptonic two-body decays of $Λ_b^0$ in light-front quark model

We study the non-leptonic two-body weak decays of $Λ_b^0 \to p M$ with $M=(π^-,K^-)$ and $(ρ^-,K^{*-})$ in the light-front quark model under the generalized factorization ansatz. By considering the Fermi statistic between quarks and determining spin-flavor structures in baryons, we calculate the branching ratios (${\cal B}$s) and CP-violating rate asymmetries ($\mathcal{A}_{CP}$s) in the decays. Explicitly, we find that ${\cal B}( Λ_b^0 \to p π^- ,pK^-)=(4.18\pm0.15\pm0.30, 5.76\pm0.88\pm0.23)\times10^{-6}$ and ${\mathcal{A}_{CP}}( Λ_b^0 \to p π^- ,\,pK^-)=(-3.60\pm0.14\pm0.14, 6.36\pm0.21\pm0.18)\%$ in comparison with the data of ${\cal B}( Λ_b^0 \to p π^- ,pK^-)=(4.5\pm0.8, 5.4\pm1.0)\times10^{-6}$ and ${\mathcal{A}_{CP}}( Λ_b^0 \to p π^- ,pK^-)=(-2.5\pm 2.9, -2.5\pm2.2)\%$ given by the Particle Data Group, respectively. We also predict that ${\cal B}( Λ_b^0 \to p ρ^-,pK^{*-} )=(12.13\pm3.27\pm0.91, 2.58\pm0.87\pm0.13)\times 10^{-6}$ and ${\mathcal{A}_{CP}}( Λ_b^0 \to p ρ^-,pK^{*-} )=(-3.32\pm0.00\pm0.14,19.25\pm0.00\pm0.80)\%$, which could be observed by the experiments at LHCb.

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