Observation of the Dsj(2463) and Confirmation of the Dsj*(2317)

Abstract

Using 13.5 inverse-femtobarns of e+e- annihilation data in the CLEO II detector at CESR, we have observed a new narrow state decaying to Ds*+ pio, denoted the DsJ(2463). A possible interpretation holds that this is a J^P = 1+^ partner to the DsJ*(2317) state recently discovered by the BaBar Collaboration which is consistent with J^P = 0^+. We have also confirmed the existence of the DsJ*(2317) in its decay to Ds+ pio. We have measured the masses of both states, accounting for the cross-feed background that the two states represent for each other, and have searched for other decay channels for both states. No narrow resonances are seen in neutral or doubly charged Ds pi modes.