  We present the first observation of the lambda_b->lambda_c pi-pi+pi- decay
using data from an integrated luminosity of approximately 2.4 fb-1 of ppbar
collisions at ECM=1.96 TeV, collected with the CDF II detector at the Fermilab
Tevatron. We also present the first observation of the resonant decays
lambda_b->sigma_c(2455)0 pi+pi- ->lambda_c pi-pi+pi-, lambda_b->sigma_c(2455)++
pi-pi- ->lambda_c pi-pi+pi-, lambda_b->lambda_c(2595)+ pi- ->lambda_c pi-pi+pi-
and lambda_b->lambda_c(2625)+ pi- ->lambda_c pi-pi+pi-, and measure their
relative branching ratios.
