In Lambda b0-> Lambda c+-> Lambda 0 pi+tau -vtau decay, the solid angle of the final-state particle tau (-) cannot be determined precisely since the decay products of the tau (-) include an undetected nu (tau). Therefore, the angular distribution of this decay cannot be measured. In this work, we construct a measurable angular distribution by considering the subsequent decay tau (-)-> pi (-)nu (tau). The full cascade decay is Lambda b0-> Lambda c+-> Lambda 0 pi+tau--> pi -v tauvtau. The three-momenta of the final-state particles Lambda (0), pi (+), and pi (-) can be measured. Considering all L...
