Using the detector ARGUS at the e+e- storage ring DORIS II at DESY, we have observed the decays Λc+ → Ξ-K+π+ and Λc+ → Ξ*0K+ and obtained evidence for the decay Ξc0 → ΛKs0. All three of these decays are of interest as they provide information about W-exchange processes. The products of cross sections and branching ratios for Λc+ → Ξ-K+π+ and Λc+ → Ξ*0K+ are (1.7±0.3±0.3) pb and (0.6±0.2±0.1) pb, respectively, which implies that (35±17) % of the Ξ-K+π+ final state is generated through a two-body decay via intermediate W-exchange. The product of production cross section and branching ratio for Ξc0 → Λ Ks0 is (2.1 ± 1.0 ± 0.6) pb.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics