Phys. Rev. D
56,
R5297–R5300
(1997)
Search for the decay τ-→4π-3π+(π0)ντ
K. W. Edwards et al.
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K. W. Edwards1, A. Bellerive2, R. Janicek2, D. B. MacFarlane2, P. M. Patel2, A. J. Sadoff3, R. Ammar4, P. Baringer4, A. Bean4, D. Besson4, D. Coppage4, C. Darling4, R. Davis4, N. Hancock4, S. Kotov4, I. Kravchenko4, N. Kwak4, S. Anderson5, Y. Kubota5, S. J. Lee5, J. J. O’Neill5, S. Patton5, R. Poling5, T. Riehle5, V. Savinov5, A. Smith5, M. S. Alam6, S. B. Athar6, Z. Ling6, A. H. Mahmood6, H. Severini6, S. Timm6, F. Wappler6, A. Anastassov7, J. E. Duboscq7, D. Fujino7, K. K. Gan7, T. Hart7, D. Homoelle7, K. Honscheid7, H. Kagan7, R. Kass7, J. Lee7, M. B. Spencer7, M. Sung7, A. Undrus7, R. Wanke7, A. Wolf7, M. M. Zoeller7, B. Nemati8, S. J. Richichi8, W. R. Ross8, P. Skubic8, M. Bishai9, J. Fast9, J. W. Hinson9, N. Menon9, D. H. Miller9, E. I. Shibata9, I. P. J. Shipsey9, M. Yurko9, L. Gibbons10, S. Glenn10, S. D. Johnson10, Y. Kwon10, S. Roberts10, E. H. Thorndike10, C. P. Jessop11, K. Lingel11, H. Marsiske11, M. L. Perl11, D. Ugolini11, R. Wang11, X. Zhou11, T. E. Coan12, V. Fadeyev12, I. Korolkov12, Y. Maravin12, I. Narsky12, V. Shelkov12, J. Staeck12, R. Stroynowski12, I. Volobouev12, J. Ye12, M. Artuso13, A. Efimov13, M. Goldberg13, D. He13, S. Kopp13, G. C. Moneti13, R. Mountain13, S. Schuh13, T. Skwarnicki13, S. Stone13, G. Viehhauser13, X. Xing13, J. Bartelt14, S. E. Csorna14, V. Jain14, K. W. McLean14, S. Marka14, R. Godang15, K. Kinoshita15, I. C. Lai15, P. Pomianowski15, S. Schrenk15, G. Bonvicini16, D. Cinabro16, R. Greene16, L. P. Perera16, G. J. Zhou16, B. Barish17, M. Chadha17, S. Chan17, G. Eigen17, J. S. Miller17, C. O’Grady17, M. Schmidtler17, J. Urheim17, A. J. Weinstein17, F. Würthwein17, D. W. Bliss18, G. Masek18, H. P. Paar18, S. Prell18, V. Sharma18, D. M. Asner19, J. Gronberg19, T. S. Hill19, D. J. Lange19, S. Menary19, R. J. Morrison19, H. N. Nelson19, T. K. Nelson19, C. Qiao19, J. D. Richman19, D. Roberts19, A. Ryd19, M. S. Witherell19, R. Balest20, B. H. Behrens20, W. T. Ford20, H. Park20, J. Roy20, J. G. Smith20, J. P. Alexander21, C. Bebek21, B. E. Berger21, K. Berkelman21, K. Bloom21, D. G. Cassel21, H. A. Cho21, D. S. Crowcroft21, M. Dickson21, P. S. Drell21, K. M. Ecklund21, R. Ehrlich21, A. D. Foland21, P. Gaidarev21, R. S. Galik21, B. Gittelman21, S. W. Gray21, D. L. Hartill21, B. K. Heltsley21, P. I. Hopman21, J. Kandaswamy21, P. C. Kim21, D. L. Kreinick21, T. Lee21, Y. Liu21, G. S. Ludwig21, N. B. Mistry21, C. R. Ng21, E. Nordberg21, M. Ogg21, J. R. Patterson21, D. Peterson21, D. Riley21, A. Soffer21, B. Valant-Spaight21, C. Ward21, M. Athanas22, P. Avery22, C. D. Jones22, M. Lohner22, C. Prescott22, J. Yelton22, J. Zheng22, G. Brandenburg23, R. A. Briere23, A. Ershov23, Y. S. Gao23, D. Y.-J. Kim23, R. Wilson23, H. Yamamoto23, T. E. Browder24, F. Li24, Y. Li24, J. L. Rodriguez24, T. Bergfeld25, B. I. Eisenstein25, J. Ernst25, G. E. Gladding25, G. D. Gollin25, R. M. Hans25, E. Johnson25, I. Karliner25, M. A. Marsh25, M. Palmer25, M. Selen25, and J. J. Thaler25
1Carleton University, Ottawa, Ontario, Canada K1S 5B6the Institute of Particle Physics, Canada
2McGill University, Montréal, Québec, Canada H3A 2T8the Institute of Particle Physics, Canada
3Ithaca College, Ithaca, New York 14850
4University of Kansas, Lawrence, Kansas 66045
5University of Minnesota, Minneapolis, Minnesota 55455
6State University of New York at Albany, Albany, New York 12222
7Ohio State University, Columbus, Ohio 43210
8University of Oklahoma, Norman, Oklahoma 73019
9Purdue University, West Lafayette, Indiana 47907
10University of Rochester, Rochester, New York 14627
11Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
12Southern Methodist University, Dallas, Texas 75275
13Syracuse University, Syracuse, New York 13244
14Vanderbilt University, Nashville, Tennessee 37235
15Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
16Wayne State University, Detroit, Michigan 48202
17California Institute of Technology, Pasadena, California 91125
18University of California, San Diego, La Jolla, California 92093
19University of California, Santa Barbara, California 93106
20University of Colorado, Boulder, Colorado 80309-0390
21Cornell University, Ithaca, New York 14853
22University of Florida, Gainesville, Florida 32611
23Harvard University, Cambridge, Massachusetts 02138
24University of Hawaii at Manoa, Honolulu, Hawaii 96822
25University of Illinois, Urbana-Champaign, Illinois 61801
Received 9 July 1997; published in the issue dated 1 November 1997
We have searched for the decay of the τ lepton into seven charged particles and zero or one π0. The data used in the search were collected with the CLEO II detector at the Cornell Electron Storage Ring (CESR) and correspond to an integrated luminosity of 4.61 fb-1. No evidence for a signal is found. Assuming all the charged particles are pions, we set an upper limit on the branching fraction B(τ-→4π-3π+(π0)ντ)<2.4×10-6 at the 90% confidence level. This limit represents a significant improvement over the previous limit.
© 1997 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.56.R5297
DOI:
10.1103/PhysRevD.56.R5297
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