Phys. Rev. Lett. 79, 799 - 803 (1997)
Search for the Decays B0 → D(*)+D(*)-
D. M. Asner et al. (CLEO Collaboration)
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D. M. Asner1, D. W. Bliss1, W. S. Brower1, G. Masek1, H. P. Paar1, V. Sharma1, J. Gronberg2, R. Kutschke2, D. J. Lange2, S. Menary2, R. J. Morrison2, H. N. Nelson2, T. K. Nelson2, C. Qiao2, J. D. Richman2, D. Roberts2, A. Ryd2, M. S. Witherell2, R. Balest3, B. H. Behrens3, K. Cho3, W. T. Ford3, H. Park3, P. Rankin3, J. Roy3, J. G. Smith3, J. P. Alexander4, C. Bebek4, B. E. Berger4, K. Berkelman4, K. Bloom4, D. G. Cassel4, H. A. Cho4, D. M. Coffman4, D. S. Crowcroft4, M. Dickson4, P. S. Drell4, K. M. Ecklund4, R. Ehrlich4, R. Elia4, A. D. Foland4, P. Gaidarev4, B. Gittelman4, S. W. Gray4, D. L. Hartill4, B. K. Heltsley4, P. I. Hopman4, J. Kandaswamy4, N. Katayama4, P. C. Kim4, D. L. Kreinick4, T. Lee4, Y. Liu4, G. S. Ludwig4, J. Masui4, J. Mevissen4, N. B. Mistry4, C. R. Ng4, E. Nordberg4, M. Ogg4, J. R. Patterson4, D. Peterson4, D. Riley4, A. Soffer4, C. Ward4, M. Athanas5, P. Avery5, C. D. Jones5, M. Lohner5, C. Prescott5, S. Yang5, J. Yelton5, J. Zheng5, G. Brandenburg6, R. A. Briere6, Y. S. Gao6, D. Y.-J. Kim6, R. Wilson6, H. Yamamoto6, T. E. Browder7, F. Li7, Y. Li7, J. L. Rodriguez7, T. Bergfeld8, B. I. Eisenstein8, J. Ernst8, G. E. Gladding8, G. D. Gollin8, R. M. Hans8, E. Johnson8, I. Karliner8, M. A. Marsh8, M. Palmer8, M. Selen8, J. J. Thaler8, K. W. Edwards9,9b, A. Bellerive10,10b, R. Janicek10,10b, D. B. MacFarlane10,10b, K. W. McLean10,10b, P. M. Patel10,10b, A. J. Sadoff11, R. Ammar12, P. Baringer12, A. Bean12, D. Besson12, D. Coppage12, C. Darling12, R. Davis12, N. Hancock12, S. Kotov12, I. Kravchenko12, N. Kwak12, S. Anderson13, Y. Kubota13, M. Lattery13, J. J. O'Neill13, S. Patton13, R. Poling13, T. Riehle13, V. Savinov13, A. Smith13, M. S. Alam14, S. B. Athar14, Z. Ling14, A. H. Mahmood14, H. Severini14, S. Timm14, F. Wappler14, A. Anastassov15, S. Blinov15, J. E. Duboscq15, K. D. Fisher15, D. Fujino15, R. Fulton15, K. K. Gan15, T. Hart15, K. Honscheid15, H. Kagan15, R. Kass15, J. Lee15, M. B. Spencer15, M. Sung15, A. Undrus15, R. Wanke15, A. Wolf15, M. M. Zoeller15, B. Nemati16, S. J. Richichi16, W. R. Ross16, P. Skubic16, M. Wood16, M. Bishai17, J. Fast17, E. Gerndt17, J. W. Hinson17, N. Menon17, D. H. Miller17, E. I. Shibata17, I. P. J. Shipsey17, M. Yurko17, L. Gibbons18, S. D. Johnson18, Y. Kwon18, S. Roberts18, E. H. Thorndike18, C. P. Jessop19, K. Lingel19, H. Marsiske19, M. L. Perl19, S. F. Schaffner19, D. Ugolini19, R. Wang19, X. Zhou19, T. E. Coan20, V. Fadeyev20, I. Korolkov20, Y. Maravin20, I. Narsky20, V. Shelkov20, J. Staeck20, R. Stroynowski20, I. Volobouev20, J. Ye20, M. Artuso21, A. Efimov21, F. Frasconi21, M. Gao21, M. Goldberg21, D. He21, S. Kopp21, G. C. Moneti21, R. Mountain21, Y. Mukhin21, S. Schuh21, T. Skwarnicki21, S. Stone21, G. Viehhauser21, X. Xing21, J. Bartelt22, S. E. Csorna22, V. Jain22, S. Marka22, A. Freyberger23, R. Godang23, K. Kinoshita23, I. C. Lai23, P. Pomianowski23, S. Schrenk23, G. Bonvicini24, D. Cinabro24, R. Greene24, L. P. Perera24, B. Barish25, M. Chadha25, S. Chan25, G. Eigen25, J. S. Miller25, C. O'Grady25, M. Schmidtler25, J. Urheim25, A. J. Weinstein25, and F. Würthwein25 (CLEO Collaboration)
1University of California, San Diego, La Jolla, California 92093
2University of California, Santa Barbara, California 93106
3University of Colorado, Boulder, Colorado 80309-0390
4Cornell University, Ithaca, New York 14853
5University of Florida, Gainesville, Florida 32611
6Harvard University, Cambridge, Massachusetts 02138
7University of Hawaii at Manoa, Honolulu, Hawaii 96822
8University of Illinois, Champaign-Urbana, Illinois 61801
9Carleton University, Ottawa, Ontario, Canada K1S 5B6,
9band Institute of Particle Physics, Canada
10McGill University, Montréal, Québec, Canada H3A 2T8
10band Institute of Particles Physics, Canada
11Ithaca College, Ithaca, New York 14850
12University of Kansas, Lawrence, Kansas 66045
13University of Minnesota, Minneapolis, Minnesota 55455
14State University of New York at Albany, Albany, New York 12222
15The Ohio State University, Columbus, Ohio 43210
16University of Oklahoma, Norman, Oklahoma 73019
17Purdue University, West Lafayette, Indiana 47907
18University of Rochester, Rochester, New York 14627
19Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
20Southern Methodist University, Dallas, Texas 75275
21Syracuse University, Syracuse, New York 13244
22Vanderbilt University, Nashville, Tennessee 37235
23Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
24Wayne State University, Detroit, Michigan 48202
25California Institute of Technology, Pasadena, California 91125
Received 23 April 1997
Using the CLEO-II data set we have searched for the decays B0→D(*)+D(*)-. We observe one candidate signal event for the decay B0→D*+D*- with an expected background of 0.022±0.011 events. This yield corresponds to a branching fraction of B(B0→D*+D*-) = [5.3-3.7+7.1(stat)±1.0(syst)]×10-4 and an upper limit of B(B0→D*+D*-)<2.2×10-3 at the 90% C.L. We see no significant excess of signal above the expected background level in the other modes, and we calculate the 90% C.L. upper limits on the branching fractions to be B(B0→D*±D∓)<1.8×10-3 and B(B0→D+D-)<1.2×10-3.
©1997 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v79/p799
DOI: 10.1103/PhysRevLett.79.799
PACS: 13.25.Hw
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