Mass splitting and production of Sigma(0)(c) and Sigma(++)(c) measured in 500GeV pi(-)-N interactions

From a sample of 2722+/-78 Lambda(c)(+) decaying to the pK(-)pi(+) final state, we have observed, in the hadroproduction experiment E791 at Fermilab, 143+/-20 Sigma(c)(0) and 122+/-18 Sigma(c)(++) through their decays to Lambda(c)(+)pi(+/-). The mass difference M(Sigma(c)(0)) - M(Lambda(c)(+)) is measured to be (167.38+/-0.29+/-1.15) MeV; for M(Sigma(c)(++)) - M(Lambda(c)(+)), we find (167.76+/-0.29+/-0.15) MeV. The rare of Lambda(c)(+) production from decays of the Sigma(c) tripler is (22+/-2+/-3)% of the total Lambda(c)(+) production assuming equal rate of production from all three, as measured for Sigma(c)(0) and Sigma(c)(++). We do not observe a statistically significant Sigma(c), baryon-antibaryon production asymmetry. The x(F) and p(t)(2) spectra of Lambda(c)(+) from Sigma(c) decays are observed to be similar to those for all Lambda(c)(+)'s produced.