Phys. Rev. Lett. 62, 2233 - 2236 (1989)
B0B¯0 mixing at the Υ(4S)
M. Artuso et al.
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M. Artuso, C. Bebek, K. Berkelman, E. Blucher, J. Byrd, D. G. Cassel, E. Cheu, D. M. Coffman, T. Copie, G. Crawford, R. DeSalvo, J. W. DeWire, P. S. Drell, R. Ehrlich, R. S. Galik, B. Gittelman, S. W. Gray, A. M. Halling, D. L. Hartill, B. K. Heltsley, J. Kandaswamy, R. Kowalewski, D. L. Kreinick, Y. Kubota, J. D. Lewis, N. B. Mistry, J. Mueller, R. Namjoshi, S. Nandi, E. Nordberg, C. O’Grady, D. Peterson, M. Pisharody, D. Riley, M. Sapper, A. Silverman, S. Stone, H. Worden, M. Worris, A. J. Sadoff, P. Avery, D. Besson, L. Garren, J. Yelton, T. Bowcock, K. Kinoshita, F. M. Pipkin, M. Procario, Richard Wilson, J. Wolinski, D. Xiao, P. Baringer, P. Haas, Ha Lam, A. Jawahery, C. H. Park, D. Perticone, R. Poling, R. Fulton, M. Hempstead, T. Jensen, D. R. Johnson, H. Kagan, R. Kass, F. Morrow, J. Whitmore, W.-Y. Chen, R. L. McIlwain, D. H. Miller, C. R. Ng, E. I. Shibata, W.-M. Yao, E. H. Thorndike, M. S. Alam, N. Katayama, I. J. Kim, W. C. Li, X. C. Lou, C. R. Sun, D. Bortoletto, M. Goldberg, N. Horwitz, P. Lubrano, M. D. Mestayer, G. C. Moneti, V. Sharma, I. P. J. Shipsey, T. Skwarnicki, S. E. Csorna, T. Letson, I. C. Brock, and T. Ferguson Cornell University, Ithaca, New York 14853
Ithaca College, Ithaca, New York 14850
University of Florida, Gainesville, Florida 32611
Harvard University, Cambridge, Massachusetts 02138
University of Kansas, Lawrence, Kansas 66045
University of Maryland, College Park, Maryland 20742
University of Minnesota, Minneapolis, Minnesota 55455
Ohio State University, Columbus, Ohio 43210
Purdue University, West Lafayette, Indiana 47907
University of Rochester, Rochester, New York 14627
State University of New York at Albany, Albany, New York 12222
Syracuse University, Syracuse, New York 13210
Vanderbilt University, Nashville, Tennessee 37235
Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
Received 16 February 1989
We have measured B0B¯0 mixing by observing like-sign dilepton events in Υ(4S) decay. Assuming that the semileptonic branching fractions of the charged and neutral B mesons are equal and that the Υ(4S) decays to B+B- 55% of the time and to B0B¯0 45% of the time, we measure the mixing parameter r to be 0.19±0.06±0.06, where the first error is statistical and the second is systematic.
©1989 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevLett.62.2233
DOI: 10.1103/PhysRevLett.62.2233
PACS: 13.20.Jf, 14.40.Jz
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