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We report a measurement of the lifetime of the Lambda_b baryon in decays tothe Lambda_C+ pi- final state in a sample corresponding to 1.1 fb^-1 collectedin p-pbar collisions at sqrt(s) = 1.96 TeV by the CDF II detector at theTevatron collider. Using a sample of about 3000 fully reconstructed Lambda_bevents we measure tau(Lambda_b) = 1.401 +- 0.046 (stat) +- 0.035 (syst) ps(corresponding to c.tau(Lambda_b) = 420.1 +- 13.7 (stat) +- 10.6 (syst) um,where c is the speed of light). The ratio of this result and the world averageB^0 lifetime yields tau(Lambda_b)/tau(B^0) = 0.918 +- 0.038 (stat and syst), ingood agreement with recent theoretical predictions.

Measurement of the Lambda_b Lifetime in Lambda_b -> Lambda_c+ pi- Decays in p-pbar Collisions at sqrt(s) = 1.96 TeV