Phys. Rev. Lett.
76,
4119–4123
(1996)
First Observation of the Decay τ-→K-ηντ
J. Bartelt et al. (CLEO Collaboration)
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J. Bartelt1, S. E. Csorna1, V. Jain1, S. Marka1, A. Freyberger2, D. Gibaut2, K. Kinoshita2, P. Pomianowski2, S. Schrenk2, D. Cinabro3, B. Barish4, M. Chadha4, S. Chan4, G. Eigen4, J. S. Miller4, C. O'Grady4, M. Schmidtler4, J. Urheim4, A. J. Weinstein4, F. Würthwein4, D. M. Asner5, M. Athanas5, D. W. Bliss5, W. S. Brower5, G. Masek5, H. P. Paar5, J. Gronberg6, C. M. Korte6, R. Kutschke6, S. Menary6, R. J. Morrison6, S. Nakanishi6, H. N. Nelson6, T. K. Nelson6, C. Qiao6, J. D. Richman6, D. Roberts6, A. Ryd6, H. Tajima6, M. S. Witherell6, R. Balest7, K. Cho7, W. T. Ford7, M. Lohner7, H. Park7, P. Rankin7, J. Roy7, J. G. Smith7, J. P. Alexander8, C. Bebek8, B. E. Berger8, K. Berkelman8, K. Bloom8, D. G. Cassel8, H. A. Cho8, D. M. Coffman8, D. S. Crowcroft8, M. Dickson8, P. S. Drell8, D. J. Dumas8, R. Ehrlich8, R. Elia8, P. Gaidarev8, R. S. Galik8, B. Gittelman8, S. W. Gray8, D. L. Hartill8, B. K. Heltsley8, C. D. Jones8, S. L. Jones8, J. Kandaswamy8, N. Katayama8, P. C. Kim8, D. L. Kreinick8, T. Lee8, Y. Liu8, G. S. Ludwig8, J. Masui8, J. Mevissen8, N. B. Mistry8, C. R. Ng8, E. Nordberg8, J. R. Patterson8, D. Peterson8, D. Riley8, A. Soffer8, C. Ward8, P. Avery9, C. Prescott9, S. Yang9, J. Yelton9, G. Brandenburg10, R. A. Briere10, T. Liu10, M. Saulnier10, R. Wilson10, H. Yamamoto10, T. E. Browder11, F. Li11, J. L. Rodriguez11, T. Bergfeld12, B. I. Eisenstein12, J. Ernst12, G. E. Gladding12, G. D. Gollin12, M. Palmer12, M. Selen12, J. J. Thaler12, K. W. Edwards13,13b, K. W. McLean13,13b, M. Ogg13,13b, A. Bellerive14,14b, D. I. Britton14,14b, R. Janicek14,14b, D. B. MacFarlane14,14b, P. M. Patel14,14b, B. Spaan14,14b, A. J. Sadoff15, R. Ammar16, P. Baringer16, A. Bean16, D. Besson16, D. Coppage16, N. Copty16, R. Davis16, N. Hancock16, S. Kotov16, I. Kravchenko16, N. Kwak16, S. Anderson17, Y. Kubota17, M. Lattery17, J. K. Nelson17, S. Patton17, R. Poling17, T. Riehle17, V. Savinov17, M. S. Alam18, I. J. Kim18, Z. Ling18, A. H. Mahmood18, J. J. O'Neill18, H. Severini18, C. R. Sun18, S. Timm18, F. Wappler18, J. E. Duboscq19, R. Fulton19, D. Fujino19, K. K. Gan19, K. Honscheid19, H. Kagan19, R. Kass19, J. Lee19, M. Sung19, A. Undrus19, C. White19, R. Wanke19, A. Wolf19, M. M. Zoeller19, X. Fu20, B. Nemati20, S. J. Richichi20, W. R. Ross20, P. Skubic20, M. Wood20, M. Bishai21, J. Fast21, E. Gerndt21, J. W. Hinson21, T. Miao21, D. H. Miller21, M. Modesitt21, E. I. Shibata21, I. P. J. Shipsey21, P. N. Wang21, M. Yurko21, L. Gibbons22, S. D. Johnson22, Y. Kwon22, S. Roberts22, E. H. Thorndike22, C. P. Jessop23, K. Lingel23, H. Marsiske23, M. L. Perl23, S. F. Schaffner23, R. Wang23, T. E. Coan24, J. Dominick24, V. Fadeyev24, I. Korolkov24, M. Lambrecht24, S. Sanghera24, V. Shelkov24, R. Stroynowski24, I. Volobouev24, G. Wei24, M. Artuso25, A. Efimov25, M. Gao25, M. Goldberg25, R. Greene25, D. He25, N. Horwitz25, S. Kopp25, G. C. Moneti25, R. Mountain25, Y. Mukhin25, S. Playfer25, T. Skwarnicki25, S. Stone25, and X. Xing25 (CLEO Collaboration)
1Vanderbilt University, Nashville, Tennessee 37235
2Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
3Wayne State University, Detroit, Michigan 48202
4California Institute of Technology, Pasadena, California 91125
5University of California, San Diego, La Jolla, California 92093
6University of California, Santa Barbara, California 93106
7University of Colorado, Boulder, Colorado 80309-0390
8Cornell University, Ithaca, New York 14853
9University of Florida, Gainesville, Florida 32611
10Harvard University, Cambridge, Massachusetts 02138
11University of Hawaii at Manoa, Honolulu, Hawaii 96822
12University of Illinois, Champaign-Urbana, Illinois 61801
13Carleton University, Ottawa, Ontario, Canada K1S 5B6
13band the Institute of Particle Physics, Montréal, Québec, Canada
14McGill University, Montréal, Québec, Canada H3A 2T8
14band the Institute of Particle Physics, Montréal, Québec, Canada
15Ithaca College, Ithaca, New York 14850
16University of Kansas, Lawrence, Kansas 66045
17University of Minnesota, Minneapolis, Minnesota 55455
18State University of New York at Albany, Albany, New York 12222
19The Ohio State University, Columbus, Ohio 43210
20University of Oklahoma, Norman, Oklahoma 73019
21Purdue University, West Lafayette, Indiana 47907
22University of Rochester, Rochester, New York 14627
23Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
24Southern Methodist University, Dallas, Texas 75275
25Syracuse University, Syracuse, New York 13244
Received 12 January 1996; published in the issue dated 27 May 1996
The decay τ-→K-ηντ has been observed with the CLEO II detector. The η meson is reconstructed using two decay channels, η→γγ and π+π-π0. The measured branching fraction is B(τ-→K-ηντ) = (2.6±0.5±0.4)×10-4, somewhat higher than theoretical estimates. An improved upper limit for the second-class-current decay τ-→π-ηντ is set, B(τ-→π-ηντ)<1.4×10-4 at 95% C.L., consistent with theoretical expectations.
© 1996 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.4119
DOI:
10.1103/PhysRevLett.76.4119
PACS:
13.35.Dx, 14.40.Aq, 14.60.Fg
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