Phys. Rev. Lett. 86, 2950 - 2954 (2001)
Search for B → τν and B → Kνν̅
T. E. Browder et al. (CLEO Collaboration)
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T. E. Browder1, Y. Li1, J. L. Rodriguez1, H. Yamamoto1, T. Bergfeld2, B. I. Eisenstein2, J. Ernst2, G. E. Gladding2, G. D. Gollin2, R. M. Hans2, E. Johnson2, I. Karliner2, M. A. Marsh2, M. Palmer2, C. Plager2, C. Sedlack2, M. Selen2, J. J. Thaler2, J. Williams2, K. W. Edwards3,3b, R. Janicek4,4b, P. M. Patel4,4b, A. J. Sadoff5, R. Ammar6, A. Bean6, D. Besson6, R. Davis6, N. Kwak6, X. Zhao6, S. Anderson7, V. V. Frolov7, Y. Kubota7, S. J. Lee7, R. Mahapatra7, J. J. O'Neill7, R. Poling7, T. Riehle7, A. Smith7, C. J. Stepaniak7, J. Urheim7, S. Ahmed8, M. S. Alam8, S. B. Athar8, L. Jian8, L. Ling8, M. Saleem8, S. Timm8, F. Wappler8, A. Anastassov9, J. E. Duboscq9, E. Eckhart9, K. K. Gan9, C. Gwon9, T. Hart9, K. Honscheid9, D. Hufnagel9, H. Kagan9, R. Kass9, T. K. Pedlar9, H. Schwarthoff9, J. B. Thayer9, E. von Toerne9, M. M. Zoeller9, S. J. Richichi10, H. Severini10, P. Skubic10, A. Undrus10, S. Chen11, J. Fast11, J. W. Hinson11, J. Lee11, D. H. Miller11, E. I. Shibata11, I. P. J. Shipsey11, V. Pavlunin11, D. Cronin-Hennessy12, A. L. Lyon12, E. H. Thorndike12, C. P. Jessop13, H. Marsiske13, M. L. Perl13, V. Savinov13, D. Ugolini13, X. Zhou13, T. E. Coan14, V. Fadeyev14, Y. Maravin14, I. Narsky14, R. Stroynowski14, J. Ye14, T. Wlodek14, M. Artuso15, R. Ayad15, C. Boulahouache15, K. Bukin15, E. Dambasuren15, S. Karamov15, G. Majumder15, G. C. Moneti15, R. Mountain15, S. Schuh15, T. Skwarnicki15, S. Stone15, G. Viehhauser15, J. C. Wang15, A. Wolf15, J. Wu15, S. Kopp16, A. H. Mahmood17, S. E. Csorna18, I. Danko18, K. W. McLean18, Sz. Márka18, Z. Xu18, R. Godang19, K. Kinoshita19 *, I. C. Lai19, S. Schrenk19, G. Bonvicini20, D. Cinabro20, S. McGee20, L. P. Perera20, G. J. Zhou20, E. Lipeles21, S. P. Pappas21, M. Schmidtler21, A. Shapiro21, W. M. Sun21, A. J. Weinstein21, F. Würthwein21 †, D. E. Jaffe22, G. Masek22, H. P. Paar22, E. M. Potter22, S. Prell22, V. Sharma22, D. M. Asner23, A. Eppich23, T. S. Hill23, R. J. Morrison23, R. A. Briere24, T. Ferguson24, H. Vogel24, B. H. Behrens25, W. T. Ford25, A. Gritsan25, J. Roy25, J. G. Smith25, J. P. Alexander26, R. Baker26, C. Bebek26, B. E. Berger26, K. Berkelman26, F. Blanc26, V. Boisvert26, D. G. Cassel26, M. Dickson26, P. S. Drell26, K. M. Ecklund26, R. Ehrlich26, A. D. Foland26, P. Gaidarev26, L. Gibbons26, B. Gittelman26, S. W. Gray26, D. L. Hartill26, B. K. Heltsley26, P. I. Hopman26, C. D. Jones26, D. L. Kreinick26, M. Lohner26, A. Magerkurth26, T. O. Meyer26, N. B. Mistry26, E. Nordberg26, J. R. Patterson26, D. Peterson26, D. Riley26, J. G. Thayer26, P. G. Thies26, D. Urner26, B. Valant-Spaight26, A. Warburton26, P. Avery27, C. Prescott27, A. I. Rubiera27, J. Yelton27, J. Zheng27, G. Brandenburg28, A. Ershov28, Y. S. Gao28, D. Y.-J. Kim28, and R. Wilson28 (CLEO Collaboration)
1University of Hawaii at Manoa, Honolulu, Hawaii 96822
2University of Illinois, Urbana-Champaign, Illinois 61801
3aCarleton University, Ottawa, Ontario, Canada K1S 5B6
3band the Institute of Particle Physics, Canada
4aMcGill University, Montréal, Québec, Canada H3A 2T8
4band the Institute of Particle Physics, Canada
5Ithaca College, Ithaca, New York 14850
6University of Kansas, Lawrence, Kansas 66045
7University of Minnesota, Minneapolis, Minnesota 55455
8State University of New York at Albany, Albany, New York 12222
9The Ohio State University, Columbus, Ohio 43210
10University of Oklahoma, Norman, Oklahoma 73019
11Purdue University, West Lafayette, Indiana 47907
12University of Rochester, Rochester, New York 14627
13Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
14Southern Methodist University, Dallas, Texas 75275
15Syracuse University, Syracuse, New York 13244
16University of Texas, Austin, Texas 78712
17University of Texas–Pan American, Edinburg, Texas 78539
18Vanderbilt University, Nashville, Tennessee 37235
19Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
20Wayne State University, Detroit, Michigan 48202
21California Institute of Technology, Pasadena, California 91125
22University of California, San Diego, La Jolla, California 92093
23University of California, Santa Barbara, California 93106
24Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
25University of Colorado, Boulder, Colorado 80309-0390
26Cornell University, Ithaca, New York 14853
27University of Florida, Gainesville, Florida 32611
28Harvard University, Cambridge, Massachusetts 02138
Received 26 July 2000
We report results of a search for B→τν in a sample of 9.7×106 charged B meson decays. We exclusively reconstruct the companion B̅ decay to suppress background. We set an upper limit on the branching fraction B(B→τν)<8.4×10-4 at 90% confidence level. We also establish B(B±→K±νν̅ )<2.4×10-4 at 90% confidence level.
©2001 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevLett.86.2950
DOI: 10.1103/PhysRevLett.86.2950
PACS: 13.20.He, 14.40.Nd, 14.60.Fg
* Permanent address: University of Cincinnati, Cincinnati, OH 45221.
† Permanent address: Massachusetts Institute of Technology, Cambridge, MA 02139.
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