First observation of a Υ(1D) state

G. Bonvicini*, D. Cinabro, M. Dubrovin, A. Bornheim, E. Lipeles, S. P. Pappas, A. Shapiro, 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. DuboscqK. 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, V. E. Kuznetsov, A. Magerkurth, H. Mahlke-Krüger, T. O. Meyer, J. R. Patterson, T. K. Pedlar, D. Peterson, J. Pivarski, D. Riley, J. L. Rosner, A. J. Sadoff, H. Schwarthoff, M. R. Shepherd, W. M. Sun, J. G. Thayer, D. Urner, T. Wilksen, M. Weinberger, S. B. Athar, P. Avery, L. Breva-Newell, V. Potlia, H. Stoeck, J. Yelton, B. I. Eisenstein, G. D. Gollin, I. Karliner, N. Lowrey, P. Naik, C. Sedlack, M. Selen, J. J. Thaler, J. Williams, K. W. Edwards, D. Besson, K. Y. Gao, D. T. Gong, Y. Kubota, S. Z. Li, R. Poling, A. W. Scott, A. Smith, C. J. Stepaniak, J. Urheim, Z. Metreveli, K. K. Seth, A. Tomaradze, P. Zweber, J. Ernst, K. Arms, E. Eckhart, K. K. Gan, C. Gwon, H. Severini, P. Skubic, D. M. Asner, S. A. Dytman, S. Mehrabyan, J. A. Mueller, S. Nam, V. Savinov, G. S. Huang, D. H. Miller, V. Pavlunin, B. Sanghi, E. I. Shibata, I. P.J. Shipsey, G. S. Adams, M. Chasse, J. P. Cummings, I. Danko, J. Napolitano, 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, J. Butt, E. Dambasuren, O. Dorjkhaidav, J. Haynes, N. Menaa, R. Mountain, H. Muramatsu, R. Nandakumar, R. Redjimi, R. Sia, T. Skwarnicki, S. Stone, J. C. Wang, K. Zhang, A. H. Mahmood, S. E. Csorna

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

79 Scopus citations

Abstract

We present the first evidence for the production of Υ(1D) states in the four-photon cascade, Υ(3S) →γχb(2P), χb(2P)→γΥ(1D), Υ(1D) →γχb(1P), χb(1P)→γΥ(1S) , followed by the Υ(1S) annihilation into e+e- or μ+μ-. The signal has a significance of 10.2 standard deviations. The measured product branching ratio for these five decays, (2.5±0.5±0.5)×10-5, is consistent with the theoretical estimates. The data are dominated by the production of one Υ(1D) state consistent with the J=2 assignment. Its mass is determined to be (10161.1±0.6±1.6) MeV, which is consistent with the predictions from potential models and lattice QCD calculations. We also searched for Υ(3S)→γχb(2P), χb(2P) →γΥ(1D), followed by either Υ(1D)→ηΥ(1S) or Υ(1D)→π+π-Υ(1S). We find no evidence for such decays and set upper limits on the product branching ratios.

Original languageEnglish (US)
Article number032001
Pages (from-to)032001-1-032001-7
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume70
Issue number3
DOIs
StatePublished - Aug 15 2004

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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