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From a sample of 2722 ± 78 Λ +c decaying to the pK - π + final state, we have observed, in the hadroproduction experiment E791 at Fermilab, 143 ± 20 Σ 0c and 122 ± 18 Σ ++c through their decays to Λ +c π ± . The mass difference M(Σ 0c ) -M (Λ +c ) is measured to be (167.38 ± 0.29 ± 0.15) MeV;...
We present asymmetries between the production of D + and D - mesons in Fermilab experiment E791 as a function of x F and p 2t . The data used here consist of 74 000 fully-reconstructed charmed mesons produced by a 500 GeV/c π - beam on C and Pt foils. The measurements are compared to results of models which predict differences between the production of...
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