Phys. Rev. Lett.
76,
2637–2641
(1996)
Tau Decays into Three Charged Leptons and Two Neutrinos
M. S. Alam et al. (CLEO Collaboration)
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M. S. Alam1, I. J. Kim1, Z. Ling1, A. H. Mahmood1, J. J. O'Neill1, H. Severini1, C. R. Sun1, S. Timm1, F. Wappler1, J. E. Duboscq2, R. Fulton2, D. Fujino2, K. K. Gan2, K. Honscheid2, H. Kagan2, R. Kass2, J. Lee2, M. Sung2, C. White2, R. Wanke2, A. Wolf2, M. M. Zoeller2, X. Fu3, B. Nemati3, S. J. Richichi3, W. R. Ross3, P. Skubic3, M. Wood3, M. Bishai4, J. Fast4, E. Gerndt4, J. W. Hinson4, T. Miao4, D. H. Miller4, M. Modesitt4, E. I. Shibata4, I. P. J. Shipsey4, P. N. Wang4, L. Gibbons5, S. D. Johnson5, Y. Kwon5, S. Roberts5, E. H. Thorndike5, C. P. Jessop6, K. Lingel6, H. Marsiske6, M. L. Perl6, S. F. Schaffner6, R. Wang6, T. E. Coan7, J. Dominick7, V. Fadeyev7, I. Korolkov7, M. Lambrecht7, S. Sanghera7, V. Shelkov7, R. Stroynowski7, I. Volobouev7, G. Wei7, M. Artuso8, A. Efimov8, M. Gao8, M. Goldberg8, D. He8, N. Horwitz8, S. Kopp8, G. C. Moneti8, R. Mountain8, Y. Mukhin8, S. Playfer8, T. Skwarnicki8, S. Stone8, X. Xing8, J. Bartelt9, S. E. Csorna9, V. Jain9, S. Marka9, D. Gibaut10, K. Kinoshita10, P. Pomianowski10, S. Schrenk10, B. Barish11, M. Chadha11, S. Chan11, G. Eigen11, J. S. Miller11, C. O'Grady11, M. Schmidtler11, J. Urheim11, A. J. Weinstein11, F. Würthwein11, D. M. Asner12, M. Athanas12, D. W. Bliss12, W. S. Brower12, G. Masek12, H. P. Paar12, J. Gronberg13, C. M. Korte13, R. Kutschke13, S. Menary13, R. J. Morrison13, S. Nakanishi13, H. N. Nelson13, T. K. Nelson13, C. Qiao13, J. D. Richman13, D. Roberts13, A. Ryd13, H. Tajima13, M. S. Witherell13, R. Balest14, K. Cho14, W. T. Ford14, M. Lohner14, H. Park14, P. Rankin14, J. Roy14, J. G. Smith14, J. P. Alexander15, C. Bebek15, B. E. Berger15, K. Berkelman15, K. Bloom15, D. G. Cassel15, H. A. Cho15, D. M. Coffman15, D. S. Crowcroft15, M. Dickson15, P. S. Drell15, D. J. Dumas15, R. Ehrlich15, R. Elia15, P. Gaidarev15, R. S. Galik15, B. Gittelman15, S. W. Gray15, D. L. Hartill15, B. K. Heltsley15, C. D. Jones15, S. L. Jones15, J. Kandaswamy15, N. Katayama15, P. C. Kim15, D. L. Kreinick15, T. Lee15, Y. Liu15, G. S. Ludwig15, J. Masui15, J. Mevissen15, N. B. Mistry15, C. R. Ng15, E. Nordberg15, J. R. Patterson15, D. Peterson15, D. Riley15, A. Soffer15, C. Ward15, P. Avery16, A. Freyberger16, C. Prescott16, S. Yang16, J. Yelton16, G. Brandenburg17, R. A. Briere17, D. Cinabro17, T. Liu17, M. Saulnier17, R. Wilson17, H. Yamamoto17, T. E. Browder18, F. Li18, J. L. Rodriguez18, T. Bergfeld19, B. I. Eisenstein19, J. Ernst19, G. E. Gladding19, G. D. Gollin19, M. Palmer19, M. Selen19, J. J. Thaler19, K. W. Edwards20,20b, K. W. McLean20,20b, M. Ogg20,20b, A. Bellerive21,21b, D. I. Britton21,21b, R. Janicek21,21b, D. B. MacFarlane21,21b, P. M. Patel21,21b, B. Spaan21,21b, A. J. Sadoff22, R. Ammar23, P. Baringer23, A. Bean23, D. Besson23, D. Coppage23, N. Copty23, R. Davis23, N. Hancock23, S. Kotov23, I. Kravchenko23, N. Kwak23, Y. Kubota24, M. Lattery24, J. K. Nelson24, S. Patton24, R. Poling24, T. Riehle24, and V. Savinov24 (CLEO Collaboration)
1State University of New York at Albany, Albany, New York 12222
2The Ohio State University, Columbus, Ohio 43210
3University of Oklahoma, Norman, Oklahoma 73019
4Purdue University, West Lafayette, Indiana 47907
5University of Rochester, Rochester, New York 14627
6Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
7Southern Methodist University, Dallas, Texas 75275
8Syracuse University, Syracuse, New York 13244
9Vanderbilt University, Nashville, Tennessee 37235
10Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
11California Institute of Technology, Pasadena, California 91125
12University of California, San Diego, La Jolla, California 92093
13University of California, Santa Barbara, California 93106
14University of Colorado, Boulder, Colorado 80309-0390
15Cornell University, Ithaca, New York 14853
16University of Florida, Gainesville, Florida 32611
17Harvard University, Cambridge, Massachusetts 02138
18University of Hawaii at Manoa, Honolulu, Hawaii 96822
19University of Illinois, Champaign-Urbana, Illinois 61801
20Carleton University, Ottawa, Ontario, Canada K1S 5B6
20band the Institute of Particle Physics, Montréal, Québec, Canada
21McGill University, Montréal, Québec, Canada H3A 2T8
21band the Institute of Particle Physics, Montréal, Québec, Canada
22Ithaca College, Ithaca, New York 14850
23University of Kansas, Lawrence, Kansas 66045
24University of Minnesota, Minneapolis, Minnesota 55455
Received 22 November 1995; revised 8 February 1996; published in the issue dated 8 April 1996
We search for the radiative leptonic tau decays τ→ee+e-ντνe and τ→μe+e-ντνμ using 3.60fb-1 of data collected by the CLEO-II experiment at the Cornell Electron Storage Ring. We present a first observation of the τ→ee+e-ντνe process. For this channel we measure the branching fraction B(τ→ee+e-ντνe) = (2.7-1.1-0.4-0.3+1.5+0.4+0.1)×10-5. An upper limit is established for the second channel: B(τ→μe+e-ντνμ)<3.2×10-5 at 90% C.L. Both results are consistent with the rates expected from standard model predictions.
© 1996 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.2637
DOI:
10.1103/PhysRevLett.76.2637
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