We present the first observation of the baryon decay
Lambda0(b) --> Lambda+_c pi+- followed by Lambda+_c --> pK_ pi++ in 106
pb-1 p anti-p collisions at s**(1/2) = 1.96 TeV in the CDF experiment. In order
to reduce systematic error, the measured rate for Lambda0(b) decay is
normalized to the kinematically similar meson decay B-bar0 --> D+ pi+-
followed by D+ --> pi++ k- pi++. We report the ratio of production cross
sections (sigma) times the ratio of branching fractions (B) for the momentum
region integrated above p(t) > 6 GeV/c and pseudorapi+dity range |eta| < 1.3:
sigma (p anti-p --> Lambda0(b) X) x B(Lambda0(b) --> Lambda+_c
pi+-)/B(B-bar0 --> D+ pi+-) = 0.82 +/- 0.08 (stat) +/- 0.11 (syst) +/- 0.22
(B(Lambda+_c --> p K- pi++)).
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Updated: Tuesday, 2007 March 20 15:09:14 CDT automatically from input from Carol Picciolo