Phys. Rev. Lett.
99,
122001
(2007)
[6 pages]
Measurement of Prominent η-Decay Branching Fractions
A. Lopez et al. CLEO Collaboration
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A. Lopez1, S. Mehrabyan1, H. Mendez1, J. Ramirez1, J. Y. Ge2, D. H. Miller2, B. Sanghi2, I. P. J. Shipsey2, B. Xin2, G. S. Adams3, M. Anderson3, J. P. Cummings3, I. Danko3, D. Hu3, B. Moziak3, J. Napolitano3, Q. He4, J. Insler4, H. Muramatsu4, C. S. Park4, E. H. Thorndike4, F. Yang4, M. Artuso5, S. Blusk5, S. Khalil5, J. Li5, N. Menaa5, R. Mountain5, S. Nisar5, K. Randrianarivony5, R. Sia5, T. Skwarnicki5, S. Stone5, J. C. Wang5, G. Bonvicini6, D. Cinabro6, M. Dubrovin6, A. Lincoln6, D. M. Asner7, K. W. Edwards7, P. Naik7, R. A. Briere8, T. Ferguson8, G. Tatishvili8, H. Vogel8, M. E. Watkins8, J. L. Rosner9, N. E. Adam10, J. P. Alexander10, D. G. Cassel10, J. E. Duboscq10, R. Ehrlich10, L. Fields10, R. S. Galik10, L. Gibbons10, R. Gray10, S. W. Gray10, D. L. Hartill10, B. K. Heltsley10, D. Hertz10, C. D. Jones10, J. Kandaswamy10, D. L. Kreinick10, V. E. Kuznetsov10, H. Mahlke-Krüger10, D. Mohapatra10, P. U. E. Onyisi10, J. R. Patterson10, D. Peterson10, D. Riley10, A. Ryd10, A. J. Sadoff10, X. Shi10, S. Stroiney10, W. M. Sun10, T. Wilksen10, S. B. Athar11, R. Patel11, J. Yelton11, P. Rubin12, B. I. Eisenstein13, I. Karliner13, N. Lowrey13, M. Selen13, E. J. White13, J. Wiss13, R. E. Mitchell14, M. R. Shepherd14, D. Besson15, T. K. Pedlar16, D. Cronin-Hennessy17, K. Y. Gao17, J. Hietala17, Y. Kubota17, T. Klein17, B. W. Lang17, R. Poling17, A. W. Scott17, P. Zweber17, S. Dobbs18, Z. Metreveli18, K. K. Seth18, A. Tomaradze18, J. Ernst19, K. M. Ecklund20, H. Severini21, W. Love22, and V. Savinov22 (CLEO Collaboration)
1University of Puerto Rico, Mayaguez, Puerto Rico 00681
2Purdue University, West Lafayette, Indiana 47907, USA
3Rensselaer Polytechnic Institute, Troy, New York 12180, USA
4University of Rochester, Rochester, New York 14627, USA
5Syracuse University, Syracuse, New York 13244, USA
6Wayne State University, Detroit, Michigan 48202, USA
7Carleton University, Ottawa, Ontario, Canada K1S 5B6
8Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
9Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
10Cornell University, Ithaca, New York 14853, USA
11University of Florida, Gainesville, Florida 32611, USA
12George Mason University, Fairfax, Virginia 22030, USA
13University of Illinois, Urbana-Champaign, Illinois 61801, USA
14Indiana University, Bloomington, Indiana 47405, USA
15University of Kansas, Lawrence, Kansas 66045, USA
16Luther College, Decorah, Iowa 52101, USA
17University of Minnesota, Minneapolis, Minnesota 55455, USA
18Northwestern University, Evanston, Illinois 60208, USA
19State University of New York at Albany, Albany, New York 12222, USA
20State University of New York at Buffalo, Buffalo, New York 14260, USA
21University of Oklahoma, Norman, Oklahoma 73019, USA
22University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
Received 10 July 2007; published 18 September 2007
The decay ψ(2S)→ηJ/ψ is used to measure, for the first time, all prominent η-meson branching fractions with the same experiment in the same dataset, thereby providing a consistent treatment of systematics across branching fractions. We present results for η decays to γγ, π+π-π0, 3π0, π+π-γ and e+e-γ, accounting for 99.9% of all η decays. The precision of several of the branching fractions and their ratios is improved. Two channels, π+π-γ and e+e-γ, show results that differ at the level of three standard deviations from those previously determined.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.122001
DOI:
10.1103/PhysRevLett.99.122001
PACS:
14.40.Aq, 13.20.−v, 13.25.−k
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