Phys. Rev. Lett.
99,
122002
(2007)
[5 pages]
Measurement of the η-Meson Mass Using ψ(2S)→ηJ/ψ
D. H. Miller et al. CLEO Collaboration
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D. H. Miller1, B. Sanghi1, I. P. J. Shipsey1, B. Xin1, G. S. Adams2, M. Anderson2, J. P. Cummings2, I. Danko2, J. Y. Ge2, D. Hu2, B. Moziak2, J. Napolitano2, Q. He3, J. Insler3, H. Muramatsu3, C. S. Park3, E. H. Thorndike3, F. Yang3, M. Artuso4, S. Blusk4, S. Khalil4, J. Li4, N. Menaa4, R. Mountain4, S. Nisar4, K. Randrianarivony4, R. Sia4, T. Skwarnicki4, S. Stone4, J. C. Wang4, G. Bonvicini5, D. Cinabro5, M. Dubrovin5, A. Lincoln5, D. M. Asner6, K. W. Edwards6, P. Naik6, R. A. Briere7, T. Ferguson7, G. Tatishvili7, H. Vogel7, M. E. Watkins7, J. L. Rosner8, N. E. Adam9, J. P. Alexander9, D. G. Cassel9, J. E. Duboscq9, R. Ehrlich9, L. Fields9, L. Gibbons9, R. Gray9, S. W. Gray9, D. L. Hartill9, B. K. Heltsley9, D. Hertz9, C. D. Jones9, J. Kandaswamy9, D. L. Kreinick9, V. E. Kuznetsov9, H. Mahlke-Krüger9, D. Mohapatra9, P. U. E. Onyisi9, J. R. Patterson9, D. Peterson9, D. Riley9, A. Ryd9, A. J. Sadoff9, X. Shi9, S. Stroiney9, W. M. Sun9, T. Wilksen9, S. B. Athar10, R. Patel10, J. Yelton10, P. Rubin11, B. I. Eisenstein12, I. Karliner12, N. Lowrey12, M. Selen12, E. J. White12, J. Wiss12, R. E. Mitchell13, M. R. Shepherd13, D. Besson14, T. K. Pedlar15, D. Cronin-Hennessy16, K. Y. Gao16, J. Hietala16, Y. Kubota16, T. Klein16, B. W. Lang16, R. Poling16, A. W. Scott16, P. Zweber16, S. Dobbs17, Z. Metreveli17, K. K. Seth17, A. Tomaradze17, J. Ernst18, K. M. Ecklund19, H. Severini20, W. Love21, V. Savinov21, A. Lopez22, S. Mehrabyan22, H. Mendez22, and J. Ramirez22 (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
4Syracuse University, Syracuse, New York 13244, USA
5Wayne State University, Detroit, Michigan 48202, USA
6Carleton University, Ottawa, Ontario, Canada K1S 5B6
7Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
8Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
9Cornell University, Ithaca, New York 14853, USA
10University of Florida, Gainesville, Florida 32611, USA
11George Mason University, Fairfax, Virginia 22030, USA
12University of Illinois, Urbana-Champaign, Illinois 61801, USA
13Indiana University, Bloomington, Indiana 47405, USA
14University of Kansas, Lawrence, Kansas 66045, USA
15Luther College, Decorah, Iowa 52101, USA
16University of Minnesota, Minneapolis, Minnesota 55455, USA
17Northwestern University, Evanston, Illinois 60208, USA
18State University of New York at Albany, Albany, New York 12222, USA
19State University of New York at Buffalo, Buffalo, New York 14260, USA
20University of Oklahoma, Norman, Oklahoma 73019, USA
21University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
22University of Puerto Rico, Mayaguez, Puerto Rico 00681
Received 12 July 2007; published 18 September 2007
We measure the mass of the η meson using ψ(2S)→ηJ/ψ events acquired with the CLEO-c detector operating at the CESR e+e- collider. Using the four decay modes η→γγ, 3π0, π+π-π0, and π+π-γ, we find Mη=547.785±0.017±0.057 MeV, in which the first uncertainty is statistical and the second systematic. This result has an uncertainty comparable to the two most precise previous measurements and is consistent with that of NA48, but is inconsistent at the level of 6.5σ with the much smaller mass obtained by GEM.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.122002
DOI:
10.1103/PhysRevLett.99.122002
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