Observation of Υ(3S)→τ+τ- and Tests of Lepton Universality in Υ Decays

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. DytmanW. Love, V. Savinov, O. Aquines, Z. Li, A. Lopez, S. Mehrabyan, H. Mendez, J. Ramirez, 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. Liu, Marina Artuso, Steven Roy Blusk, J. Butt, N. Horwitz, J. Li, N. Menaa, R. Mountain, S. Nisar, K. Randrianarivony, R. Redjimi, R. Sia, Tomasz Skwarnicki, Sheldon 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, R. S. Galik, 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, T. O. Meyer, 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

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Abstract

Using data collected with the CLEO III detector at the CESR e+e- collider, we report on a first observation of the decay Υ(3S)→τ+τ-, and precisely measure the ratio of branching fractions of Υ(nS), n=1, 2, 3, to τ+τ- and μ+μ- final states, finding agreement with expectations from lepton universality. We derive absolute branching fractions for these decays, and also set a limit on the influence of a low mass CP-odd Higgs boson in the decay of the Υ(1S).

Original languageEnglish (US)
Article number052002
JournalPhysical Review Letters
Volume98
Issue number5
DOIs
StatePublished - 2007

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Besson, D., Pedlar, T. K., Cronin-Hennessy, D., Gao, K. Y., Gong, D. T., Hietala, J., Kubota, Y., Klein, T., Lang, B. W., Poling, R., Scott, A. W., Smith, A., Zweber, P., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Ernst, J., Severini, H., ... Shepherd, M. R. (2007). Observation of Υ(3S)→τ+τ- and Tests of Lepton Universality in Υ Decays. Physical Review Letters, 98(5), [052002]. https://doi.org/10.1103/PhysRevLett.98.052002