2023 Impact factor 4.2
Particles and Fields

Eur. Phys. J. C 16, 289-294
DOI 10.1007/s100520000425

CP violation in $\Lambda_b \to p \pi^-$ decay

R. Mohanta

Physics Department, Panjab University, Chandigarh-160014, India

Received: 15 February 2000 / Published online: 8 June 2000 - © Springer-Verlag 2000

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 $\Lambda_b \to p \pi^-$ 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 (Nceff) as a free parameter. The form factors are evaluated in the nonrelativistic quark model. The estimated branching ratio is found to be ${\cal O}(10^{-6})$ which lies below the current experimental upper limit and the CP violating asymmetries are $a_{cp}\sim -8\% $ and $A(\alpha)
\sim 2 \times 10^{-5}$.

Copyright Società Italiana di Fisica, Springer-Verlag 2000