Phys. Rev. D
75,
012002
(2007)
[13 pages]
Measurement of B(Υ(5S)→Bs(*)B̅ s(*)) using ϕ mesons
G. S. Huang et al. CLEO Collaboration
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G. S. Huang1, D. H. Miller1, V. Pavlunin1, B. Sanghi1, I. P. J. Shipsey1, B. Xin1, G. S. Adams2, M. Anderson2, J. P. Cummings2, I. Danko2, J. Napolitano2, Q. He3, J. Insler3, H. Muramatsu3, C. S. Park3, E. H. Thorndike3, F. Yang3, T. E. Coan4, Y. S. Gao4, F. Liu4, M. Artuso5, S. Blusk5, J. Butt5, J. Li5, N. Menaa5, R. Mountain5, S. Nisar5, K. Randrianarivony5, R. Redjimi5, R. Sia5, T. Skwarnicki5, S. Stone5, J. C. Wang5, K. Zhang5, S. E. Csorna6, G. Bonvicini7, D. Cinabro7, M. Dubrovin7, A. Lincoln7, D. M. Asner8, K. W. Edwards8, R. A. Briere9, I. Brock9, J. Chen9, T. Ferguson9, G. Tatishvili9, H. Vogel9, M. E. Watkins9, J. L. Rosner10, N. E. Adam11, J. P. Alexander11, K. Berkelman11, D. G. Cassel11, J. E. Duboscq11, K. M. Ecklund11, R. Ehrlich11, L. Fields11, L. Gibbons11, R. Gray11, S. W. Gray11, D. L. Hartill11, B. K. Heltsley11, D. Hertz11, C. D. Jones11, J. Kandaswamy11, D. L. Kreinick11, V. E. Kuznetsov11, H. Mahlke-Krüger11, P. U. E. Onyisi11, J. R. Patterson11, D. Peterson11, J. Pivarski11, D. Riley11, A. Ryd11, A. J. Sadoff11, H. Schwarthoff11, X. Shi11, S. Stroiney11, W. M. Sun11, T. Wilksen11, M. Weinberger11, S. B. Athar12, R. Patel12, V. Potlia12, J. Yelton12, P. Rubin13, C. Cawlfield14, B. I. Eisenstein14, I. Karliner14, D. Kim14, N. Lowrey14, P. Naik14, C. Sedlack14, M. Selen14, E. J. White14, J. Wiss14, M. R. Shepherd15, D. Besson16, T. K. Pedlar17, D. Cronin-Hennessy18, K. Y. Gao18, D. T. Gong18, J. Hietala18, Y. Kubota18, T. Klein18, B. W. Lang18, R. Poling18, A. W. Scott18, A. Smith18, P. Zweber18, S. Dobbs19, Z. Metreveli19, K. K. Seth19, A. Tomaradze19, J. Ernst20, H. Severini21, S. A. Dytman22, W. Love22, V. Savinov22, O. Aquines23, Z. Li23, A. Lopez23, S. Mehrabyan23, H. Mendez23, and J. Ramirez23 (CLEO Collaboration)
1Purdue University, West Lafayette, Indiana 47907, USA
2Rensselaer Polytechnic Institute, Troy, New York 12180, USA
3University of Rochester, Rochester, New York 14627, USA
4Southern Methodist University, Dallas, Texas 75275, USA
5Syracuse University, Syracuse, New York 13244, USA
6Vanderbilt University, Nashville, Tennessee 37235, USA
7Wayne State University, Detroit, Michigan 48202, USA
8Carleton University, Ottawa, Ontario, Canada K1S 5B6
9Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
10Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
11Cornell University, Ithaca, New York 14853
12University of Florida, Gainesville, Florida 32611, USA
13George Mason University, Fairfax, Virginia 22030, USA
14University of Illinois, Urbana-Champaign, Illinois 61801, USA
15Indiana University, Bloomington, Indiana 47405, USA
16University of Kansas, Lawrence, Kansas 66045, USA
17Luther College, Decorah, Iowa 52101, USA
18University of Minnesota, Minneapolis, Minnesota 55455, USA
19Northwestern University, Evanston, Illinois 60208, USA
20State University of New York at Albany, Albany, New York 12222, USA
21University of Oklahoma, Norman, Oklahoma 73019, USA
22University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
23University of Puerto Rico, Mayaguez, Puerto Rico 00681
Received 12 October 2006; published 9 January 2007
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 0.423 fb-1 on the Υ(5S) resonance, 6.34 fb-1 on the Υ(4S) and 2.32 fb-1 in the continuum below the Υ(4S), we measure B(Υ(5S)→ϕX)=(13.8±0.7-1.5+2.3)% and B(Υ(4S)→ϕX)=(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 ϕ meson yield from the Υ(5S). Using these rates, and a model dependent estimate of B(Bs→ϕX), 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)%.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.75.012002
DOI:
10.1103/PhysRevD.75.012002
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