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Recently there has been much interest in the tauonic semileptonic mesondecays B -> D + tau + nu_tau and B -> D* + tau + nu_tau where one has foundlarger rates than what is predicted by the Standard Model. We analyze thecorresponding semileptonic baryon decays Lambda_b(0) -> Lambda_c(+) + tau(-) +antinu_tau with particular emphasis on the lepton helicity flip and scalarcontributions which vanish for zero lepton masses. We calculate the total rate,differential decay distributions, the longitudinal and transverse polarizationof the daughter baryon Lambda_c(+) and the tau-lepton, and the lepton-sideforward-backward asymmetries. The nonvanishing polarization of the daughterbaryon Lambda_c(+) leads to hadron-side asymmetries in e.g. the decayLambda_c(+) -> Lambda(0) + pi(+) and azimuthal correlations between the twofinal state decay planes which we specify. We provide numerical results onthese observables using results of the covariant confined quark model. We findlarge lepton mass effects in the q2-spectra and in the polarizationobservables.

The semileptonic decay Lambda_b -> Lambda_c + tau(-) + antinu_tau in the covariant confined quark model