CP violation in Λ < inf > b < /inf > → pπ < sup > - < /sup > decay

Abstract

Using the next-to-leading order QCD corrected effective Hamiltonian, scale and scheme independent Wilson coefficients, we have estimated the branching ratio and CP violating asymmetries for the Λb → pπ- decay mode in the Standard Model using the framework of generalized factorization. The effects of nonfactorizable contributions are taken into account by treating the effective no. of colors (Neffc) as a free parameter. The form factors are evaluated in the nonrelativistic quark model. The estimated branching ratio is found to be script O sign(10-6) which lies below the current experimental upper limit and the CP violating asymmetries are acp ∼ -8% and A(α) ∼ 2 × 10-5.