2000/09/30 by Andreas Warburton
Physics and Astronomy · #hep-ex
published as Proceedings of the 30th International Conference on High Energy Physics, Osaka, Japan, 27 July--2 August 2000 / eds. C.S. Lim, Taku Yamanaka, Vol. 1, pp. 387-390 (World Scientific, Singapore: 2001) · 4 pages, LaTeX2e, 4 eps figures, uses style file ws-p10x7_clns.cls (included); adapted from version contributed to the proceedings of the 30th International Conference on High Energy Physics (ICHEP2000), Osaka, Japan, July 27 - August 2, 2000; revised version reflects aspects of the Omega_c^0 analysis submitted for publication, i.e., reduced systematic uncertainties and a replacement for Fig. 4
Using ~13.7 fb-1 of e+e- collision data recorded at near the Upsilon(4S) resonance by the CLEO II and CLEO II.V detector configurations on the Cornell Electron Storage Ring, we present the world's most precise measurements of the Sigmac0, Sigmac+, and Sigmac++ charmed-baryon masses as well as the first measurements of the intrinsic widths of the Sigmac0 and Sigmac++ baryons. We also report on the first observation and mass measurement of the Sigmac*+ charmed baryon, M(Sigmac*+) - M(Lambdac+) = (231.0 +- 1.1[stat] +- 2.0[syst]) MeV/c2, and the first CLEO observation of the Omegac0 baryon, for which we measure a mass M(Omegac0) = (2694.6 +- 2.6[stat] +- 1.9[syst]) MeV/c2 from a sample of (40.4 +- 9.0[stat]) candidate events. All new results are preliminary.