Measurement of B(Υ(5S)→Bs(*)B̄s(*)) using mesons

G. S. Huang, D. H. Miller, V. Pavlunin, B. Sanghi, I. P J Shipsey, B. Xin, G. S. Adams, M. Anderson, J. P. Cummings, I. Danko, J. Napolitano, Q. He, J. Insler, H. Muramatsu, C. S. Park, E. H. Thorndike, F. Yang, T. E. Coan, Y. S. Gao, F. LiuM. Artuso, S. Blusk, J. Butt, J. Li, N. Menaa, R. Mountain, S. Nisar, K. Randrianarivony, R. Redjimi, R. Sia, T. Skwarnicki, S. Stone, J. C. Wang, K. Zhang, S. E. Csorna, G. Bonvicini, D. Cinabro, M. Dubrovin, A. Lincoln, D. M. Asner, K. W. Edwards, R. A. Briere, I. Brock, J. Chen, T. Ferguson, G. Tatishvili, H. Vogel, M. E. Watkins, J. L. Rosner, N. E. Adam, J. P. Alexander, K. Berkelman, D. G. Cassel, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, L. Fields, L. Gibbons, R. Gray, S. W. Gray, D. L. Hartill, B. K. Heltsley, D. Hertz, C. D. Jones, J. Kandaswamy, D. L. Kreinick, V. E. Kuznetsov, H. Mahlke-Krüger, P. U E Onyisi, J. R. Patterson, D. Peterson, J. Pivarski, D. Riley, A. Ryd, A. J. Sadoff, H. Schwarthoff, X. Shi, S. Stroiney, W. M. Sun, T. Wilksen, M. Weinberger, S. B. Athar, R. Patel, V. Potlia, J. Yelton, P. Rubin, C. Cawlfield, B. I. Eisenstein, I. Karliner, D. Kim, N. Lowrey, P. Naik, C. Sedlack, M. Selen, E. J. White, J. Wiss, M. R. Shepherd, D. Besson, T. K. Pedlar, D. Cronin-Hennessy, K. Y. Gao, D. T. Gong, J. Hietala, Y. Kubota, T. Klein, B. W. Lang, R. Poling, A. W. Scott, A. Smith, P. Zweber, S. Dobbs, Z. Metreveli, K. K. Seth, A. Tomaradze, J. Ernst, H. Severini, S. A. Dytman, W. Love, V. Savinov, O. Aquines, Z. Li, A. Lopez, S. Mehrabyan, H. Mendez, J. Ramirez

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Knowledge of the Bs decay fraction of the Υ(5S) resonance, fS, is important for Bs meson studies at the Υ(5S) energy. Using a data sample collected by the CLEO III detector at CESR consisting of 0.423fb-1 on the Υ(5S) resonance, 6.34fb-1 on the Υ(4S) and 2.32fb-1 in the continuum below the Υ(4S), we measure B(Υ(5S)→ X)=(13.8±0.7-1.5+2.3) % and B(Υ(4S)→ X)=(7.1±0.1±0.6)%; the ratio of the two rates is (1.9±0.1-0.2+0.3). This is the first measurement of the meson yield from the Υ(5S). Using these rates, and a model dependent estimate of B(Bs→ X), we determine fS=(24.6±2.9-5.3+11.0)%. We also update our previous independent measurement of fS made using the inclusive Ds yields to now be (16.8±2.6-3.4+6.7)%, due to a better estimate of the number of hadronic events. We also report the total Υ(5S) hadronic cross section above continuum to be σ(e+e-→Υ(5S))=(0.301±0. 002±0.039)nb. This allows us to extract the fraction of B mesons as (58.9±10.0±9.2)%, equal to 1-fS. Averaging the three methods gives a model dependent result of fS=(21-3+6)%.

Original languageEnglish (US)
Article number012002
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number1
StatePublished - 2007


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