Observation of a narrow resonance of mass 2.46 GeV/c2 decaying to D*s+π0 and confirmation of the D*sJ(2317) state

D. Besson*, S. Anderson, V. V. Frolov, D. T. Gong, Y. Kubota, S. Z. Li, R. Poling, A. Smith, C. J. Stepaniak, J. Urheim, Z. Metreveli, K. K. Seth, A. Tomaradze, P. Zweber, K. Arms, E. Eckhart, K. K. Gan, C. Gwon, T. K. Pedlar, E. Von ToerneH. Severini, P. Skubic, S. A. Dytman, J. A. Mueller, S. Nam, V. Savinov, J. W. Hinson, G. S. Huang, J. Lee, D. H. Miller, V. Pavlunin, B. Sanghi, E. I. Shibata, I. P.J. Shipsey, D. Cronin-Hennessy, C. S. Park, W. Park, J. B. Thayer, E. H. Thorndike, T. E. Coan, Y. S. Gao, F. Liu, R. Stroynowski, M. Artuso, C. Boulahouache, S. Blusk, E. Dambasuren, O. Dorjkhaidav, R. Mountain, H. Muramatsu, R. Nandakumar, T. Skwarnicki, S. Stone, J. C. Wang, A. H. Mahmood, S. E. Csorna, I. Danko, G. Bonvicini, D. Cinabro, M. Dubrovin, S. McGee, A. Bornheim, E. Lipeles, S. P. Pappas, A. Shapiro, W. M. Sun, A. J. Weinstein, R. A. Briere, G. P. Chen, T. Ferguson, G. Tatishvili, H. Vogel, M. E. Watkins, N. E. Adam, J. P. Alexander, K. Berkelman, V. Boisvert, D. G. Cassel, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, R. S. Galik, L. Gibbons, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, L. Hsu, C. D. Jones, J. Kandaswamy, D. L. Kreinick, A. Magerkurth, H. Mahlke-Krüger, T. O. Meyer, N. B. Mistry, J. R. Patterson, D. Peterson, J. Pivarski, S. J. Richichi

*Corresponding author for this work

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Abstract

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+ π0 with a mass near 2.46 GeV/c2. 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+ π0. Reconstructing the Ds + π0 and D*s+ π0 final states in CLEO data, we observe peaks in both of the corresponding reconstructed mass difference distributions, ΔM(D sπ0) = M(Dsπ0) - M(D s) and ΔM(D*s π0) = M(D*s π0) - M(D*s), both of them at values near 350 MeV/c2. We interpret these peaks as signatures of two distinct states, the D*sJ(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(Ds π0)〉 = 350.0 ±1.2 (stat) ± 1.0 (syst) MeV/c2 for the D*sJ(2317)+ state, and 〈ΔM(D* s 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 D*s+ γ, Ds+ γ, and Ds+ π+ π-. The observations of the two states at 2.32 and 2.46 GeV/c2, in the D s+ π0 and D*s+ π0 decay channels, respectively, are consistent with their interpretations as cs̄ mesons with an orbital angular momentum L = 1 and spin and parity JP = 0+ and 1+.

Original languageEnglish (US)
Article number032002
JournalPhysical Review D
Volume68
Issue number3
DOIs
StatePublished - 2003

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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