We present a measurement of asymmetries in the production of Lambda (+)(c)
and Lambda (-)(c) baryons in 500 GeV/c pi (-)-nucleon interactions from the
E791 experiment at Fermilab. The asymmetries were measured as functions of
Feynman x (x(F)) and transverse momentum squared (p(T)(2)) using a sample
of 1819 +/- 62 Lambda (c)'s observed in the decay channel Lambda (+)(c) -->
pK(-)pi (+). We observe more Lambda (+)(c) than Lambda (-)(c) baryons, wit
h an asymmetry of (12.7 +/- 3.4 +/- 1.3)% independent of x(F) and p(T)(2) i
n our kinematical range (-0.1 less than or equal to x(F) less than or equal
to 0.6 and 0.0 less than or equal to p(T)(2) less than or equal to 8.0 (Ge
V/c)(2)). This Lambda (c) asymmetry measurement is the first with data in b
oth the positive and negative x(F) regions. (C) 2000 Elsevier Science B.V.
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