Phys. Rev. Lett.
71,
1791–1795
(1993)
Measurement of the decay τ-→π-π+π-2π0ντ
D. Bortoletto et al.
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D. Bortoletto, D. N. Brown, J. Fast, R. L. McIlwain, T. Miao, D. H. Miller, M. Modesitt, S. F. Schaffner, E. I. Shibata, I. P. J. Shipsey, P. N. Wang, M. Battle, J. Ernst, H. Kroha, S. Roberts, K. Sparks, E. H. Thorndike, C. H. Wang, J. Dominick, S. Sanghera, T. Skwarnicki, R. Stroynowski, M. Artuso, D. He, M. Goldberg, N. Horwitz, R. Kennett, G. C. Moneti, F. Muheim, Y. Mukhin, S. Playfer, Y. Rozen, S. Stone, M. Thulasidas, G. Vasseur, G. Zhu, J. Bartelt, S. E. Csorna, Z. Egyed, V. Jain, P. Sheldon, D. S. Akerib, B. Barish, M. Chadha, S. Chan, D. F. Cowen, G. Eigen, J. S. Miller, C. O’Grady, J. Urheim, A. J. Weinstein, D. Acosta, M. Athanas, G. Masek, B. Ong, H. Paar, M. Sivertz, A. Bean, J. Gronberg, R. Kutschke, S. Menary, R. J. Morrison, S. Nakanishi, H. N. Nelson, T. K. Nelson, J. D. Richman, A. Ryd, H. Tajima, D. Schmidt, D. Sperka, M. S. Witherell, M. Procario, S. Yang, R. Balest, K. Cho, M. Dauodi, W. T. Ford, D. R. Johnson, K. Lingel, M. Lohner, P. Rankin, J. G. Smith, J. P. Alexander, C. Bebek, K. Berkelman, D. Besson, T. E. Browder, D. G. Cassel, H. A. Cho, D. M. Coffman, P. S. Drell, R. Ehrlich, M. Garcia-Sciveres, B. Geiser, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, C. D. Jones, S. L. Jones, J. Kandaswamy, N. Katayama, P. C. Kim, D. L. Kreinick, G. S. Ludwig, J. Masui, J. Mevissen, N. B. Mistry, C. R. Ng, E. Nordberg, M. Ogg, J. R. Patterson, D. Peterson, D. Riley, S. Salman, M. Sapper, H. Worden, F. Würthwein, P. Avery, A. Freyberger, J. Rodriguez, R. Stephens, J. Yelton, D. Cinabro, S. Henderson, K. Kinoshita, T. Liu, M. Saulnier, F. Shen, R. Wilson, H. Yamamoto, M. Selen, A. J. Sadoff, R. Ammar, S. Ball, P. Baringer, D. Coppage, N. Copty, R. Davis, N. Hancock, M. Kelly, N. Kwak, H. Lam, Y. Kubota, M. Lattery, J. K. Nelson, S. Patton, D. Perticone, R. Poling, V. Savinov, S. Schrenk, R. Wang, M. S. Alam, I. J. Kim, B. Nemati, J. J. O’Neill, H. Severini, C. R. Sun, M. M. Zoeller, G. Crawford, C. M. Daubenmier, R. Fulton, D. Fujino, K. K. Gan, K. Honscheid, H. Kagan, R. Kass, J. Lee, R. Malchow, F. Morrow, Y. Skovpen, M. Sung, C. White, J. Whitmore, P. Wilson, F. Butler, X. Fu, G. Kalbfleisch, M. Lambrecht, W. R. Ross, P. Skubic, J. Snow, P. L. Wang, and M. Wood
Purdue University, West Lafayette, Indiana 47907
University of Rochester, Rochester, New York 14627
Southern Methodist University, Dallas, Texas 75275
Syracuse University, Syracuse, New York 13244
Vanderbilt University, Nashville, Tennessee 37235
California Institute of Technology, Pasadena, California 91125
University of California, San Diego, La Jolla, California 92093
University of California, Santa Barbara, California 93106
Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213
University of Colorado, Boulder, Colorado 80309-0390
Cornell University, Ithaca, New York 14853
University of Florida, Gainesville, Florida 32611
Harvard University, Cambridge, Massachusetts 02138
University of Illinois, Champaign-Urbana, Illinois 61801
Ithaca College, Ithaca, New York 14850
University of Kansas, Lawrence, Kansas 66045
University of Minnesota, Minneapolis, Minnesota 55455
State University of New York at Albany, Albany, New York 12222
Ohio State University, Columbus, Ohio 43210
University of Oklahoma, Norman, Oklahoma 73019
Received 6 July 1993; published in the issue dated 20 September 1993
The decay τ-→π-π+π-2π0ντ has been observed in e+e- annihilation using the CLEO II detector at the Cornell Electron Storage Ring. In a data sample collected at √s ∼10.6 GeV, 668±38 decay candidates have been identified by exclusively reconstructing two π0’s accompanying three charged particles, which are assumed to be pions. Normalizing to the number of τ pairs detected with one charged particle recoiling against three charged particles, this yields a branching ratio of B3π2π0=(0.48±0.04±0.04)%. A signal of 430±33 events for the decay τ-→π-ωπ0ντ has also been observed, corresponding to a branching ratio of Bπωπ0=(0.39±0.04±0.04)%.
© 1993 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.71.1791
DOI:
10.1103/PhysRevLett.71.1791
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