Observation of a narrow resonance of mass 2.46 GeV/c2 decaying to Ds*+π0 and confirmation of the DsJ*(2317) state -: art. no. 032002

Using 13.5 fb(-1) of e(+)e(-) annihilation data collected with the CLEO II detector, we have observed a narrow resonance decaying to D-s*(+)pi(0) with a mass near 2.46 GeV/c(2). The search for such a state was motivated by the recent discovery by the BaBar Collaboration of a narrow state at 2.32 GeV/c(2), the D-sJ*(2317)(+), that decays to D(s)(+)pi(0). Reconstructing the D(s)(+)pi(0) and D-s*(+)pi(0) final states in CLEO data, we observe peaks in both of the corresponding reconstructed mass difference distributions, DeltaM(D(s)pi(0))=M(D(s)pi(0))-M(D-s) and DeltaM(D-s*pi(0))=M(D-s*pi(0))-M(D-s*), both of them at values near 350 MeV/c(2). We interpret these peaks as signatures of two distinct states, the D-sJ*(2317)(+) plus a new state, designated as the D-sJ(2463)(+). Because of the similar DeltaM values, each of these states represents a source of background for the other if photons are lost, ignored or added. A quantitative accounting of these reflections confirms that both states exist. We have measured the mean mass differences <DeltaM(D(s)pi(0))>=350.0+/-1.2 (stat)+/-1.0 (syst) MeV/c(2) for the D-sJ*(2317)(+) state, and <DeltaM(D-s*pi(0))>=351.2+/-1.7 (stat)+/-1.0 (syst) MeV/c(2) for the new D-sJ(2463)(+) state. We have also searched, but find no evidence, for decays of the two states via the channels D-s*(+)gamma, D(s)(+)gamma, and D(s)(+)pi(+)pi(-). The observations of the two states at 2.32 and 2.46 GeV/c(2), in the D(s)(+)pi(0) and D-s*(+)pi(0) decay channels, respectively, are consistent with their interpretations as c (s) over bar mesons with an orbital angular momentum L=1 and spin and parity J(P)=0(+) and 1(+).