Search for hadronic Lambda(0)(b) decays with DELPHI

A search for the Lambda(b)(0) beauty baryon decays in exclusive hadronic channels was performed using about 3 million Z(0) decays collected with the DELPHI detector at LEP. The analysis relies on the combined use of the accurate tracking and of the hadron identification capabilities of DELPHI. Preliminary results are given for the channels Lambda(0) J/psi and Lambda(c)(+) pi(-). An upper limit at 90% C.L. for Lambda(b)(0) --> Lambda(0) J/psi is obtained at 6.510(-4)/f(lb), where f(lb) is the probability that a b quark hadroniizes into a Lambda(b)(0). Three candidates have been observed in Lambda(b)(0) --> Lambda(c)(+)pi(-) decay mode. These events correspond to a Lambda(b)(0) mass of (5656 +/- 22(stat.)+/-6(syst.)) MeV/c(2).