Phys. Rev. D
45,
3976–3985
(1992)
Electronic branching ratio of the τ lepton
R. Ammar et al. (CLEO Collaboration)
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R. Ammar, P. Baringer, D. Coppage, R. Davis, M. Kelly, N. Kwak, H. Lam, S. Ro, Y. Kubota, M. Lattery, J. K. Nelson, D. Perticone, R. Poling, S. Schrenk, R. Wang, M. S. Alam, I. J. Kim, B. Nemati, V. Romero, C. R. Sun, P. -N. Wang, M. M. Zoeller, G. Crawford, R. Fulton, K. K. Gan, H. Kagan, R. Kass, J. Lee, R. Malchow, F. Morrow, M. K. Sung, J. Whitmore, P. Wilson, F. Butler, X. Fu, G. Kalbfleisch, M. Lambrecht, P. Skubic, J. Snow, P. -L. Wang, D. Bortoletto, D. N. Brown, J. Dominick, R. L. McIlwain, D. H. Miller, M. Modesitt, E. I. Shibata, S. F. Schaffner, I. P. J. Shipsey, M. Battle, J. Ernst, H. Kroha, S. Roberts, K. Sparks, E. H. Thorndike, C. -H. Wang, R. Stroynowski, M. Artuso, M. Goldberg, T. Haupt, N. Horwitz, R. Kennett, G. C. Moneti, S. Playfer, Y. Rozen, P. Rubin, T. Skwarnicki, S. Stone, M. Thulasidas, W. -M. Yao, G. Zhu, A. V. Barnes, J. Bartelt, S. E. Csorna, V. Jain, T. Letson, M. D. Mestayer, D. S. Akerib, B. Barish, M. Chadha, D. F. Cowen, G. Eigen, J. S. Miller, J. Urheim, A. J. Weinstein, R. J. Morrison, H. Tajima, D. Schmidt, D. Sperka, M. Procario, M. Daoudi, W. T. Ford, D. R. Johnson, K. Lingel, M. Lohner, P. Rankin, J. G. Smith, J. Alexander, C. Bebek, K. Berkelman, D. Besson, T. E. Browder, D. G. Cassel, E. Cheu, D. M. Coffman, P. S. Drell, R. Ehrlich, R. S. Galik, M. Garcia-Sciveres, B. Geiser, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, K. Honscheid, C. Jones, J. Kandaswamy, N. Katayama, P. C. Kim, D. L. Kreinick, G. S. Ludwig, J. Masui, J. Mevissen, N. B. Mistry, S. Nandi, C. R. Ng, E. Nordberg, C. O'Grady, J. R. Patterson, D. Peterson, D. Riley, M. Sapper, M. Selen, H. Worden, M. Worris, F. Würthwein, P. Avery, A. Freyberger, J. Rodriguez, J. Yelton, S. Henderson, K. Kinoshita, F. Pipkin,*, M. Saulnier, R. Wilson, J. Wolinski, D. Xiao, H. Yamamoto, and A. J. Sadoff (CLEO Collaboration)
aUniversity of Kansas, Lawrence, Kansas 66045
bUniversity of Minnesota, Minneapolis, Minnesota 55455
cState University of New York at Albany, Albany, New York 12222
dOhio State University, Columbus, Ohio, 43210
eUniversity of Oklahoma, Norman, Oklahoma 73019
fPurdue University, West Lafayette, Indiana 47907
gUniversity of Rochester, Rochester, New York 14627
hSouthern Methodist University, Dallas, Texas 75275
iSyracuse University, Syracuse, New York 13244
jVanderbilt University, Nashville, Tennessee 37235
kCalifornia Institute of Technology, Pasadena, California 91125
lUniversity of California at Santa Barbara, Santa Barbara, California 93106
mCarnegie-Mellon University, Pittsburgh, Pennsylvania, 15213
nUniversity of Colorado, Boulder, Colorado 80309-0390
oCornell University, Ithaca, New York 14853
pUniversity of Florida, Gainesville, Florida 32611
qHarvard University, Cambridge, Massachusetts 02138
rIthaca College, Ithaca, New York 14850
Received 2 December 1991; published in the issue dated 1 June 1992
Using data accumulated by the CLEO I detector operating at the Cornell Electron Storage Ring, we have measured the ratio R=Γ(τ→eν̅ eντ)/Γ1 where Γ1 is the τ decay rate to final states with one charged particle. We find R=0.2231±0.0044±0.0073 where the first error is statistical and the second is systematic. Together with the measured topological one-charged-particle branching fraction, this yields the branching fraction of the τ lepton to electrons, Be=0.192±0.004±0.006.
© 1992 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.45.3976
DOI:
10.1103/PhysRevD.45.3976
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