Phys. Rev. Lett. 84, 1393 - 1397 (2000)
First Observation of the Decay B → J/ψφK
A. Anastassov et al. (CLEO Collaboration)
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A. Anastassov1, J. E. Duboscq1, K. K. Gan1, C. Gwon1, T. Hart1, K. Honscheid1, D. Hufnagel1, H. Kagan1, R. Kass1, J. Lorenc1, T. K. Pedlar1, H. Schwarthoff1, E. von Toerne1, M. M. Zoeller1, S. J. Richichi2, H. Severini2, P. Skubic2, A. Undrus2, S. Chen3, J. Fast3, J. W. Hinson3, J. Lee3, N. Menon3, D. H. Miller3, E. I. Shibata3, I. P. J. Shipsey3, V. Pavlunin3, D. Cronin-Hennessy4, Y. Kwon4 *, A. L. Lyon4, E. H. Thorndike4, C. P. Jessop5, H. Marsiske5, M. L. Perl5, V. Savinov5, D. Ugolini5, X. Zhou5, T. E. Coan6, V. Fadeyev6, I. Korolkov6, Y. Maravin6, I. Narsky6, R. Stroynowski6, J. Ye6, T. Wlodek6, M. Artuso7, R. Ayad7, C. Boulahouache7, K. Bukin7, E. Dambasuren7, S. Karamov7, S. Kopp7, G. Majumder7, G. C. Moneti7, R. Mountain7, S. Schuh7, T. Skwarnicki7, S. Stone7, G. Viehhauser7, J. C. Wang7, A. Wolf7, J. Wu7, S. E. Csorna8, I. Danko8, K. W. McLean8, Sz. Márka8, Z. Xu8, R. Godang9, K. Kinoshita9 †, I. C. Lai9, S. Schrenk9, G. Bonvicini10, D. Cinabro10, L. P. Perera10, G. J. Zhou10, G. Eigen11, E. Lipeles11, M. Schmidtler11, A. Shapiro11, W. M. Sun11, A. J. Weinstein11, F. Würthwein11 ‡, D. E. Jaffe12, G. Masek12, H. P. Paar12, E. M. Potter12, S. Prell12, V. Sharma12, D. M. Asner13, A. Eppich13, J. Gronberg13, T. S. Hill13, D. J. Lange13, R. J. Morrison13, H. N. Nelson13, R. A. Briere14, B. H. Behrens15, W. T. Ford15, A. Gritsan15, J. Roy15, J. G. Smith15, J. P. Alexander16, R. Baker16, C. Bebek16, B. E. Berger16, K. Berkelman16, F. Blanc16, V. Boisvert16, D. G. Cassel16, M. Dickson16, P. S. Drell16, K. M. Ecklund16, R. Ehrlich16, A. D. Foland16, P. Gaidarev16, L. Gibbons16, B. Gittelman16, S. W. Gray16, D. L. Hartill16, B. K. Heltsley16, P. I. Hopman16, C. D. Jones16, D. L. Kreinick16, M. Lohner16, A. Magerkurth16, T. O. Meyer16, N. B. Mistry16, C. R. Ng16, E. Nordberg16, J. R. Patterson16, D. Peterson16, D. Riley16, J. G. Thayer16, P. G. Thies16, B. Valant-Spaight16, A. Warburton16, P. Avery17, C. Prescott17, A. I. Rubiera17, J. Yelton17, J. Zheng17, G. Brandenburg18, A. Ershov18, Y. S. Gao18, D. Y.-J. Kim18, R. Wilson18, T. E. Browder19, Y. Li19, J. L. Rodriguez19, H. Yamamoto19, T. Bergfeld20, B. I. Eisenstein20, J. Ernst20, G. E. Gladding20, G. D. Gollin20, R. M. Hans20, E. Johnson20, I. Karliner20, M. A. Marsh20, M. Palmer20, C. Plager20, C. Sedlack20, M. Selen20, J. J. Thaler20, J. Williams20, K. W. Edwards21,21b, R. Janicek22,22b, P. M. Patel22,22b, A. J. Sadoff23, R. Ammar24, P. Baringer24, A. Bean24, D. Besson24, R. Davis24, I. Kravchenko24, N. Kwak24, X. Zhao24, S. Anderson25, V. V. Frolov25, Y. Kubota25, S. J. Lee25, R. Mahapatra25, J. J. O'Neill25, R. Poling25, T. Riehle25, A. Smith25, J. Urheim25, S. Ahmed26, M. S. Alam26, S. B. Athar26, L. Jian26, L. Ling26, A. H. Mahmood26 §, M. Saleem26, S. Timm26, and F. Wappler26 (CLEO Collaboration)
1Ohio State University, Columbus, Ohio 43210
2University of Oklahoma, Norman, Oklahoma 73019
3Purdue University, West Lafayette, Indiana 47907
4University of Rochester, Rochester, New York 14627
5Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
6Southern Methodist University, Dallas, Texas 75275
7Syracuse University, Syracuse, New York 13244
8Vanderbilt University, Nashville, Tennessee 37235
9Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
10Wayne State University, Detroit, Michigan 48202
11California Institute of Technology, Pasadena, California 91125
12University of California, San Diego, La Jolla, California 92093
13University of California, Santa Barbara, California 93106
14Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
15University of Colorado, Boulder, Colorado 80309-0390
16Cornell University, Ithaca, New York 14853
17University of Florida, Gainesville, Florida 32611
18Harvard University, Cambridge, Massachusetts 02138
19University of Hawaii at Manoa, Honolulu, Hawaii 96822
20University of Illinois, Urbana-Champaign, Illinois 61801
21aCarleton University, Ottawa, Ontario, Canada K1S 5B6
21band the Institute of Particle Physics, Canada
22aMcGill University, Montréal, Québec, Canada H3A 2T8
22band the Institute of Particle Physics, Canada
23Ithaca College, Ithaca, New York 14850
24University of Kansas, Lawrence, Kansas 66045
25University of Minnesota, Minneapolis, Minnesota 55455
26State University of New York at Albany, Albany, New York 12222
Received 3 November 1999
We present the first observation of the decay B→J/ψφK. Using 9.6×106 BB̅ meson pairs collected with the CLEO detector, we have observed ten fully reconstructed B→J/ψφK candidates, whereas the estimated background is 0.5±0.2 event. We obtain a branching fraction of B(B→J/ψφK) = (8.8-3.0+3.5[stat]±1.3[syst])×10-5. This is the first observed B meson decay requiring the creation of an additional ss̅ quark pair.
©2000 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevLett.84.1393
DOI: 10.1103/PhysRevLett.84.1393
PACS: 13.25.Hw, 12.38.Qk
* Permanent address: Yonsei University, Seoul 120-749, Korea.
† Permanent address: University of Cincinnati, Cincinnati, OH 45221.
‡ Permanent address: Massachusetts Institute of Technology, Cambridge, MA 02139.
§ Permanent address: University of Texas-Pan American, Edinburg, TX 78539.
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