Phys. Rev. Lett.
67,
3351–3355
(1991)
Measurement of B0B¯0 mixing at the Fermilab Tevatron Collider
F. Abe et al.
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F. Abe, D. Amidei, G. Apollinari, M. Atac, P. Auchincloss, A. R. Baden, N. Bacchetta, M. W. Bailey, A. Bamberger, B. A. Barnett, A. Barbaro-Galtieri, V. E. Barnes, T. Baumann, F. Bedeschi, S. Behrends, S. Belforte, G. Bellettini, J. Bellinger, J. Bensinger, A. Beretvas, J. P. Berge, S. Bertolucci, S. Bhadra, M. Binkley, R. Blair, C. Blocker, V. Bolognesi, A. W. Booth, C. Boswell, G. Brandenburg, D. Brown, E. Buckley-Geer, H. S. Budd, G. Busetto, A. Byon-Wagner, K. L. Byrum, C. Campagnari, M. Campbell, R. Carey, W. Carithers, D. Carlsmith, J. T. Carroll, R. Cashmore, A. Castro, F. Cervelli, K. Chadwick, G. Chiarelli, W. Chinowsky, S. Cihangir, A. G. Clark, D. Connor, M. Contreras, J. Cooper, M. Cordelli, D. Crane, M. Curatolo, C. Day, F. DeJongh, S. Dell’Agnello, M. Dell’Orso, L. Demortier, B. Denby, P. F. Derwent, T. Devlin, D. DiBitonto, R. B. Drucker, J. E. Elias, R. Ely, S. Eno, S. Errede, B. Esposito, B. Flaugher, G. W. Foster, M. Franklin, J. Freeman, H. Frisch, T. Fuess, Y. Fukui, Y. Funayama, A. F. Garfinkel, A. Gauthier, S. Geer, D. W. Gerdes, P. Giannetti, N. Giokaris, P. Giromini, L. Gladney, M. Gold, K. Goulianos, H. Grassmann, C. Grosso-Pilcher, C. Haber, S. R. Hahn, R. Handler, K. Hara, R. M. Harris, J. Hauser, C. Hawk, T. Hessing, R. Hollebeek, L. Holloway, P. Hu, B. Hubbard, B. T. Huffman, R. Hughes, P. Hurst, J. Huth, M. Incagli, T. Ino, H. Iso, H. Jensen, C. P. Jessop, R. P. Johnson, U. Joshi, R. W. Kadel, T. Kamon, S. Kanda, D. A. Kardelis, I. Karliner, E. Kearns, L. Keeble, R. Kephart, P. Kesten, R. M. Keup, H. Keutelian, D. Kim, S. Kim, L. Kirsch, K. Kondo, J. Konigsberg, E. Kovacs, S. E. Kuhlmann, E. Kuns, A. T. Laasanen, J. I. Lamoureux, S. Leone, W. Li, T. M. Liss, N. Lockyer, C. B. Luchini, P. Lukens, P. Maas, M. Mangano, J. P. Marriner, M. Mariotti, R. Markeloff, L. A. Markosky, R. Mattingly, P. McIntyre, A. Menzione, T. Meyer, S. Mikamo, M. Miller, T. Mimashi, S. Miscetti, M. Mishina, S. Miyashita, Y. Morita, S. Moulding, J. Mueller, A. Mukherjee, L. F. Nakae, I. Nakano, C. Nelson, C. Newman-Holmes, J. S. T. Ng, M. Ninomiya, L. Nodulman, S. Ogawa, R. Paoletti, A. Para, E. Pare, J. Patrick, T. J. Phillips, R. Plunkett, L. Pondrom, J. Proudfoot, G. Punzi, D. Quarrie, K. Ragan, G. Redlinger, J. Rhoades, M. Roach, F. Rimondi, L. Ristori, T. Rohaly, A. Roodman, W. K. Sakumoto, A. Sansoni, R. D. Sard, A. Savoy-Navarro, V. Scarpine, P. Schlabach, E. E. Schmidt, M. H. Schub, R. Schwitters, A. Scribano, S. Segler, Y. Seiya, M. Sekiguchi, M. Shapiro, N. M. Shaw, M. Sheaff, M. Shochet, J. Siegrist, P. Sinervo, J. Skarha, K. Sliwa, D. A. Smith, F. D. Snider, L. Song, R. St. Denis, A. Stefanini, G. Sullivan, R. L. Swartz, Jr., M. Takano, F. Tartarelli, K. Takikawa, S. Tarem, D. Theriot, M. Timko, P. Tipton, S. Tkaczyk, A. Tollestrup, J. Tonnison, W. Trischuk, N. Turini, Y. Tsay, F. Ukegawa, D. Underwood, S. Vejcik, III, R. Vidal, R. G. Wagner, R. L. Wagner, N. Wainer, J. Walsh, T. Watts, R. Webb, C. Wendt, H. Wenzel, W. C. Wester, III, T. Westhusing, S. N. White, A. B. Wicklund, H. H. Williams, B. L. Winer, J. Wyss, A. Yagil, A. Yamashita, K. Yasuoka, G. P. Yeh, J. Yoh, M. Yokoyama, J. C. Yun, A. Zanetti, F. Zetti, and S. Zucchelli
Argonne National Laboratory, Argonne, Illinois 60439
Brandeis University, Waltham, Massachusetts 02254
University of Chicago, Chicago, Illinois 60637
Fermi National Accelerator Laboratory, Batavia, Illinois 60510
Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, Frascati, Italy
Harvard University, Cambridge, Massachusetts 02138
University of Illinois, Urbana, Illinois 61801
The Johns Hopkins University, Baltimore, Maryland 21218
National Laboratory for High Energy Physics (KEK), Ibaraki, Japan
Lawrence Berkeley Laboratory, Berkeley, California 94720
Instituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy
University of Pennsylvania, Philadelphia, Pennsylvania 19104
Istituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, Italy
Purdue University, West Lafayette, Indiana 47907
University of Rochester, Rochester, New York 14627
Rockefeller University, New York, New York 10021
Rutgers University, Piscataway, New Jersey 08854
Texas A&M University, College Station, Texas 77843
University of Tsukuba, Tsukuba, Ibaraki 305, Japan
Tufts University, Medford, Massachusetts 02155
University of Wisconsin–Madison, Madison, Wisconsin 53706
Received 6 August 1991; published in the issue dated 9 December 1991
The B0 B¯ 0 average mixing parameter χ has been extracted from eμ and ee events produced in pp¯ collisions at √s =1.8 TeV. In a sample of 900 eμ events, the like-sign to opposite-sign charge ratio R is measured to be 0.556±0.048(stat)-0.042+0.035(syst). In the absence of mixing, the expected value of R would be 0.23±0.06. The corresponding number for 212 ee events is 0.573±0.116(stat)±0.047(syst) with an expected nonmixing value of 0.24±0.07. The observed excess in R leads to a combined determination of χ=0.176±0.031(stat+syst) ±0.032 (model), where the last uncertainty is due to Monte Carlo modeling.
© 1991 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.67.3351
DOI:
10.1103/PhysRevLett.67.3351
PACS:
14.40.Jz, 12.15.Ff, 13.20.Jf, 13.85.Qk
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