In the last decade the CLEO II collaboration, using the CESR e+c -storage ring, has accumulated nearly 15fb -1 of luminosity, in the energy region around 10.5 GeV, corresponding to the production of more than 3. l0 T charmed particles (apart from daughters of B meson decay). This has produced new results in the spectroscopy of charmed baryons and mesons and a much improved limit on D O -~-6 mixing. We present evidence for an excitation of the ~.o, seen in both charge states; namely, the ~c, ~' the jv = ~1+ c{sq} state, which is symmetric under exchange of light quark quantum numbers. Another state ~* and is consistent is seen in the decays to .~+Ir+zr -and ~cwยฐ-+Tr-~' via an intermediate ~c, with the ~cl,the jv = 3-p-wave state analogous to the A+(2625). The mass differences relative to the ground state are: M(E +') -M(E~) = (107.8 4-1.7 + 2.5)MeV/c 2, M(E ยฐ') -M(7~c) = (107.0 =t= 1.5 4-2.5)MeV/c ~, M(~.+) -M(E +) = (348.6 4-0.6 =t= 1.O)MeV/c 2, and M(EยฐI) -M(E ยฐ) = (347.2 4-0.7 ยฑ 2.0)MeV/c 2. We have made the first (preliminary) mea-2 98 +.38 surements of the natural widths of the E ++ and E ยฐ baryons: F++ = ( . -.3s 4-0.5)MeV, and F ยฐ (2 63 +'3s 4-0.5)MeV. In the charmed meson sector we find evidence for a = ', " --.33
wide 1 + state,the Dยฐ(2460). Its mass is ,(2.461+' ยฐ41_.o34 =t= .010 ยฑ .032)GeV; its width is (290+1 ยฐ1 + 26 ยฑ 36)MeV. We find no supporting evidence for the D *'+, a purported radial excitation claimed by the Delphi group at a mass of (2637 4-2 ยฑ 6)MeV. Finally we are able, using "wrong-sign" (DCSD) KTr decays to make the following measurements: 1) the observed ratio of DCSD decays relative to the Cabibbo-allowed rate is R~ -(0.34 4-0.7 4-.06)% , 2) the mixing parameters are bounded, at 95% confidence, by x n < .001 and -.059 < y' < .003. x ~ and y' are, in the absence of finM state phase differences, the reM and imaginary parts of 5M/F.