Phys. Rev. Lett.
79,
2406–2410
(1997)
First Observation of τ→3πηντ and τ→ f1πντ Decays
T. Bergfeld et al. (CLEO Collaboration)
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T. Bergfeld1, B. I. Eisenstein1, J. Ernst1, G. E. Gladding1, G. D. Gollin1, R. M. Hans1, E. Johnson1, I. Karliner1, M. A. Marsh1, M. Palmer1, M. Selen1, J. J. Thaler1, K. W. Edwards2,2b, A. Bellerive3,3b, R. Janicek3,3b, D. B. MacFarlane3,3b, P. M. Patel3,3b, A. J. Sadoff4, R. Ammar5, P. Baringer5, A. Bean5, D. Besson5, D. Coppage5, C. Darling5, R. Davis5, N. Hancock5, S. Kotov5, I. Kravchenko5, N. Kwak5, S. Anderson6, Y. Kubota6, S. J. Lee6, J. J. O'Neill6, S. Patton6, R. Poling6, T. Riehle6, V. Savinov6, A. Smith6, M. S. Alam7, S. B. Athar7, Z. Ling7, A. H. Mahmood7, H. Severini7, S. Timm7, F. Wappler7, A. Anastassov8, S. Blinov8, J. E. Duboscq8, D. Fujino8, K. K. Gan8, T. Hart8, K. Honscheid8, H. Kagan8, R. Kass8, J. Lee8, M. B. Spencer8, M. Sung8, A. Undrus8, R. Wanke8, A. Wolf8, M. M. Zoeller8, B. Nemati9, S. J. Richichi9, W. R. Ross9, P. Skubic9, M. Bishai10, J. Fast10, E. Gerndt10, J. W. Hinson10, N. Menon10, D. H. Miller10, E. I. Shibata10, I. P. J. Shipsey10, M. Yurko10, L. Gibbons11, S. Glenn11, S. D. Johnson11, Y. Kwon11, S. Roberts11, E. H. Thorndike11, C. P. Jessop12, K. Lingel12, H. Marsiske12, M. L. Perl12, D. Ugolini12, R. Wang12, X. Zhou12, T. E. Coan13, V. Fadeyev13, I. Korolkov13, Y. Maravin13, I. Narsky13, V. Shelkov13, J. Staeck13, R. Stroynowski13, I. Volobouev13, J. Ye13, M. Artuso14, A. Efimov14, M. Gao14, M. Goldberg14, D. He14, S. Kopp14, G. C. Moneti14, R. Mountain14, S. Schuh14, T. Skwarnicki14, S. Stone14, G. Viehhauser14, X. Xing14, J. Bartelt15, S. E. Csorna15, V. Jain15, K. W. McLean15, S. Marka15, R. Godang16, K. Kinoshita16, I. C. Lai16, P. Pomianowski16, S. Schrenk16, G. Bonvicini17, D. Cinabro17, R. Greene17, L. P. Perera17, G. J. Zhou17, B. Barish18, M. Chadha18, S. Chan18, G. Eigen18, J. S. Miller18, C. O'Grady18, M. Schmidtler18, J. Urheim18, A. J. Weinstein18, F. Würthwein18, D. W. Bliss19, G. Masek19, H. P. Paar19, S. Prell19, V. Sharma19, D. M. Asner20, J. Gronberg20, T. S. Hill20, R. Kutschke20, D. J. Lange20, S. Menary20, R. J. Morrison20, H. N. Nelson20, T. K. Nelson20, C. Qiao20, J. D. Richman20, D. Roberts20, A. Ryd20, M. S. Witherell20, R. Balest21, B. H. Behrens21, W. T. Ford21, H. Park21, J. Roy21, J. G. Smith21, J. P. Alexander22, C. Bebek22, B. E. Berger22, K. Berkelman22, K. Bloom22, D. G. Cassel22, H. A. Cho22, D. M. Coffman22, D. S. Crowcroft22, M. Dickson22, P. S. Drell22, K. M. Ecklund22, R. Ehrlich22, A. D. Foland22, P. Gaidarev22, R. S. Galik22, B. Gittelman22, S. W. Gray22, D. L. Hartill22, B. K. Heltsley22, P. I. Hopman22, J. Kandaswamy22, P. C. Kim22, D. L. Kreinick22, T. Lee22, Y. Liu22, G. S. Ludwig22, J. Masui22, J. Mevissen22, N. B. Mistry22, C. R. Ng22, E. Nordberg22, M. Ogg22, J. R. Patterson22, D. Peterson22, D. Riley22, A. Soffer22, B. Valant-Spaight22, C. Ward22, M. Athanas23, P. Avery23, C. D. Jones23, M. Lohner23, C. Prescott23, J. Yelton23, J. Zheng23, G. Brandenburg24, R. A. Briere24, A. Ershov24, Y. S. Gao24, D. Y.-J. Kim24, R. Wilson24, H. Yamamoto24, T. E. Browder25, F. Li25, Y. Li25, and J. L. Rodriguez25 (CLEO Collaboration)
1University of Illinois, Champaign-Urbana, Illinois 61801
2Carleton University, Ottawa, Ontario, Canada K1S 5B6,
2band the Institute of Particle Physics, Montreál, Québec, Canada
3McGill University, Montréal, Québec, Canada H3A 2T8,
3band the Institute of Particle Physics, Montreál, Québec, Canada
4Ithaca College, Ithaca, New York 14850
5University of Kansas, Lawrence, Kansas 66045
6University of Minnesota, Minneapolis, Minnesota 55455
7State University of New York at Albany, Albany, New York 12222
8The Ohio State University, Columbus, Ohio 43210
9University of Oklahoma, Norman, Oklahoma 73019
10Purdue University, West Lafayette, Indiana 47907
11University of Rochester, Rochester, New York 14627
12Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
13Southern Methodist University, Dallas, Texas 75275
14Syracuse University, Syracuse, New York 13244
15Vanderbilt University, Nashville, Tennessee 37235
16Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
17Wayne State University, Detroit, Michigan 48202
18California Institute of Technology, Pasadena, California 91125
19University of California, San Diego, La Jolla, California 92093
20University of California, Santa Barbara, California 93106
21University of Colorado, Boulder, Colorado 80309-0390
22Cornell University, Ithaca, New York 14853
23University of Florida, Gainesville, Florida 32611
24Harvard University, Cambridge, Massachusetts 02138
25University of Hawaii at Manoa, Honolulu, Hawaii 96822
Received 25 June 1997; published in the issue dated 29 September 1997
We have observed new channels for τ decays with an η in the final state. We study 3-prong tau decays, using the η→γγ and η→3π0 decay modes and 1-prong decays with two π0's using the η→γγ channel. The measured branching fractions are B(τ-→π-π-π+ηντ) = (3.4-0.5+0.6±0.6)×10-4 and B(τ-→π-2π0ηντ) = (1.4±0.6±0.3)×10-4. We observe clear evidence for f1→ηππ substructure and measure B(τ-→f1π-ντ) = (5.8-1.3+1.4±1.8)×10-4. We have also searched for η′(958) production and obtain 90% C.L. upper limits B(τ-→π-η′ντ)<7.4×10-5 and B(τ-→π-π0η′ντ)<8.0×10-5.
© 1997 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.2406
DOI:
10.1103/PhysRevLett.79.2406
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