Date of this Version
We report on a search for Λ b0-->pπ- and Λ b0-->pK- (and charge conjugate) decays in pp̅ collisions at sqrt(s)=1.96 TeV using 193 pb-1 of data collected by the CDF II experiment at the Fermilab Tevatron Collider. Data were collected using a track trigger that has been optimized to select tracks belonging to a secondary vertex that is typical of two-body charmless decays of b-flavored hadrons, including Λ b0 baryons. As no Λ b0 signal was observed, we set the upper limits on the branching fraction Ɓ( Λ b0--> ph-), where h is K or π, of 2.3×10-5 at 90% C.L. and 2.9×10-5 at 95% C.L.