Phys. Rev. Lett.
84,
830–834
(2000)
Observation of Radiative Leptonic Decay of the Tau Lepton
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, C. Plager1, C. Sedlack1, M. Selen1, J. J. Thaler1, J. Williams1, K. W. Edwards2a,2b, R. Janicek2a,2b, P. M. Patel3a,3b, A. J. Sadoff4, R. Ammar5, P. Baringer5, A. Bean5, D. Besson5, R. Davis5, S. Kotov5, I. Kravchenko5, N. Kwak5, X. Zhao5, S. Anderson6, V. V. Frolov6, Y. Kubota6, S. J. Lee6, R. Mahapatra6, J. J. O'Neill6, R. Poling6, T. Riehle6, A. Smith6, S. Ahmed7, M. S. Alam7, S. B. Athar7, L. Jian7, L. Ling7, A. H. Mahmood7,*, M. Saleem7, S. Timm7, F. Wappler7, A. Anastassov8, J. E. Duboscq8, K. K. Gan8, C. Gwon8, T. Hart8, K. Honscheid8, H. Kagan8, R. Kass8, J. Lorenc8, H. Schwarthoff8, E. von Toerne8, M. M. Zoeller8, S. J. Richichi9, H. Severini9, P. Skubic9, A. Undrus9, M. Bishai10, S. Chen10, J. Fast10, J. W. Hinson10, J. Lee10, N. Menon10, D. H. Miller10, E. I. Shibata10, I. P. J. Shipsey10, Y. Kwon11,†, A. L. Lyon11, E. H. Thorndike11, C. P. Jessop12, K. Lingel12, H. Marsiske12, M. L. Perl12, V. Savinov12, D. Ugolini12, X. Zhou12, T. E. Coan13, V. Fadeyev13, I. Korolkov13, Y. Maravin13, I. Narsky13, R. Stroynowski13, J. Ye13, T. Wlodek13, M. Artuso14, R. Ayad14, E. Dambasuren14, S. Kopp14, G. Majumder14, G. C. Moneti14, R. Mountain14, S. Schuh14, T. Skwarnicki14, S. Stone14, A. Titov14, G. Viehhauser14, J. C. Wang14, A. Wolf14, J. Wu14, S. E. Csorna15, K. W. McLean15, S. Marka15, Z. Xu15, R. Godang16, K. Kinoshita16,‡, I. C. Lai16, S. Schrenk16, G. Bonvicini17, D. Cinabro17, R. Greene17, L. P. Perera17, G. J. Zhou17, S. Chan18, G. Eigen18, E. Lipeles18, M. Schmidtler18, A. Shapiro18, W. M. Sun18, J. Urheim18, A. J. Weinstein18, F. Würthwein18, D. E. Jaffe19, G. Masek19, H. P. Paar19, E. M. Potter19, S. Prell19, V. Sharma19, D. M. Asner20, A. Eppich20, J. Gronberg20, T. S. Hill20, D. J. Lange20, R. J. Morrison20, T. K. Nelson20, R. A. Briere21, B. H. Behrens22, W. T. Ford22, A. Gritsan22, H. Krieg22, J. Roy22, J. G. Smith22, J. P. Alexander23, R. Baker23, C. Bebek23, B. E. Berger23, K. Berkelman23, F. Blanc23, V. Boisvert23, D. G. Cassel23, M. Dickson23, P. S. Drell23, K. M. Ecklund23, R. Ehrlich23, A. D. Foland23, P. Gaidarev23, R. S. Galik23, L. Gibbons23, B. Gittelman23, S. W. Gray23, D. L. Hartill23, B. K. Heltsley23, P. I. Hopman23, C. D. Jones23, D. L. Kreinick23, T. Lee23, Y. Liu23, T. O. Meyer23, N. B. Mistry23, C. R. Ng23, E. Nordberg23, J. R. Patterson23, D. Peterson23, D. Riley23, J. G. Thayer23, P. G. Thies23, B. Valant-Spaight23, A. Warburton23, P. Avery24, M. Lohner24, C. Prescott24, A. I. Rubiera24, J. Yelton24, J. Zheng24, G. Brandenburg25, A. Ershov25, Y. S. Gao25, D. Y.-J. Kim25, R. Wilson25, T. E. Browder26, Y. Li26, J. L. Rodriguez26, and H. Yamamoto26 (CLEO Collaboration)
1University of Illinois, Urbana-Champaign, Illinois 61801
2aCarleton University, Ottawa, Ontario, Canada K1S 5B6
2band the Institute of Particle Physics, Canada
3aMcGill University, Montréal, Québec, Canada H3A 2T8
3band the Institute of Particle Physics, 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
8Ohio 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
21Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
22University of Colorado, Boulder, Colorado 80309-0390
23Cornell University, Ithaca, New York 14853
24University of Florida, Gainesville, Florida 32611
25Harvard University, Cambridge, Massachusetts 02138
26University of Hawaii at Manoa, Honolulu, Hawaii 96822
Received 7 September 1999; published in the issue dated 31 January 2000
Using 4.68fb-1 of e+e- annihilation data collected with the CLEO II detector at the Cornell Electron Storage Ring, we have studied τ radiative decays τ-→ντμ-ν̅ μγ and τ-→ντe-ν̅ eγ. For a 10 MeV minimum photon energy in the τ rest frame, the branching fraction for radiative τ decay to a muon or electron is measured to be (3.61±0.16±0.35)×10-3 or (1.75±0.06±0.17)×10-2, respectively. The branching fractions are in agreement with standard model theoretical predictions.
© 2000 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.830
DOI:
10.1103/PhysRevLett.84.830
PACS:
13.35.Dx, 13.10.+q, 14.60.Fg
*Permanent address: University of Texas–Pan American, Edinburg, TX 78539. †Permanent address: Yonsei University, Seoul 120-749, Korea. ‡Permanent address: University of Cincinnati, Cincinnati, OH 45221.
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