Physical Review D 72,5 (2005) 051104(R);
We report on a search for Lambda(b)(0)-> p pi(-) and Lambda(b)(0)-> pK(-) (and charge conjugate) decays in p (p) over bar collisions at root 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 Lambda(b)(0) baryons. As no Lambda(b)(0) signal was observed, we set the upper limits on the branching fraction B(Lambda(b)(0)-> ph(-)), where h is K or pi, of 2.3x10(-5) at 90% C.L. and 2.9x10(-5) at 95% C.L.
branching fractions;; cp violation;; b decays;; quark;; lifetime;; detector;; baryons
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