Study of $Λ_b\toΛν\barν$ with Polarized Baryons

Abstract

We investigate the decay of $Λ_b\toΛν\barν$ with the polarized baryons of $Λ_b$ and $Λ$. With the most general hadronic form factors, we first study the decay branching ratio and then derive the longitudinal, normal and transverse polarizations of $Λ$ in terms of the spin unit vectors of $Λ_b$ and $Λ$ and the momentum of $Λ$. A polarization of $Λ_b$ is also discussed.