Phys. Rev. D 68, 032002 (2003) [10 pages]Observation of a narrow resonance of mass 2.46 GeV/c2 decaying to Ds*+π0 and confirmation of the DsJ*(2317) stateSee Also: Publisher's Note Received 28 May 2003; published 28 August 2003; corrected 6 June 2007 Using 13.5 fb-1 of e+e- annihilation data collected with the CLEO II detector, we have observed a narrow resonance decaying to Ds*+π0 with a mass near 2.46GeV/c2. The search for such a state was motivated by the recent discovery by the BaBar Collaboration of a narrow state at 2.32GeV/c2, the DsJ*(2317)+, that decays to Ds+π0. Reconstructing the Ds+π0 and Ds*+π0 final states in CLEO data, we observe peaks in both of the corresponding reconstructed mass difference distributions, ΔM(Dsπ0)=M(Dsπ0)-M(Ds) and ΔM(Ds*π0)=M(Ds*π0)-M(Ds*), both of them at values near 350MeV/c2. We interpret these peaks as signatures of two distinct states, the DsJ*(2317)+ plus a new state, designated as the DsJ(2463)+. Because of the similar ΔM 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 〈ΔM(Dsπ0)〉=350.0±1.2(stat)±1.0(syst)MeV/c2 for the DsJ*(2317)+ state, and 〈ΔM(Ds*π0)〉=351.2±1.7(stat)±1.0(syst)MeV/c2 for the new DsJ(2463)+ state. We have also searched, but find no evidence, for decays of the two states via the channels Ds*+γ,Ds+γ, and Ds+π+π-. The observations of the two states at 2.32 and 2.46GeV/c2, in the Ds+π0 and Ds*+π0 decay channels, respectively, are consistent with their interpretations as cs̅ mesons with an orbital angular momentum L=1 and spin and parity JP=0+ and 1+. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.68.032002
DOI:
10.1103/PhysRevD.68.032002
PACS:
14.40.Lb, 12.40.Yx, 13.25.Ft
See AlsoPublisher's Note: D. Besson et al. CLEO Collaboration, Publisher’s Note: Observation of a narrow resonance of mass 2.46 GeV/c2 decaying to Ds*+π0 and confirmation of the DsJ*(2317) state [Phys. Rev. D 68, 032002 (2003)], Phys. Rev. D 75, 119908 (2007). |
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