Using the CLEO II detector at CESR, we have observed two charmed states, where the higher mass state decays to D0π+ and to D*0π+, while the lower mass state decays to D*0π+, but not to D0π+. The masses and widths were measured to be 2425±2±2 MeV/c2 and 26-7-4+8+4 MeV/c2 for the lower mass state, and 2463±3±3 MeV/c2 and 27-8-5+11+5 MeV/c2 for the higher mass state. Properties of these states, including their decay angular distributions and spin-parity assignments have been studied. The results of this analysis support the identification of these states as the charged L = 1 D1 (2420)+ and D2* (2460)+, respectively. The isospin mass splittings between these states and their neutral partners have also been measured. This is the first full reconstruction of any decay mode of the D1 (2420)+ and the first observation of the decay of D2* (2460)+ to D*0π+.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics