Charmless two body hadronic decays of Λ b baryon

Using a theoretical framework based on the next-to-leading order QCD improved effective Hamiltonian, we have estimated the branching ratios and asymmetry parameters for the two body charmless nonleptonic decay modes of Λb baryon i.e. Λb → p(π/ρ), p(K/K) and Λ(π/ρ), within the framework of generalized factorization. The nonfactorizable contributions are parametrized in terms of the effective number of colors, N eff c . So in addition to the naive factorization approach (N eff c = 3), here we have taken two more values for N eff c i.e., N eff c = 2 and ∞. The baryonic form factors at maximum momentum transfer (q2 m) are evaluated using the nonrelativistic quark model and the extrapolation of the form factors from q2 m to the required q 2 value is done by assuming the pole dominance. The obtained branching ratios for Λb → pπ, pK processes lie within the present experimental upper limit .