Phys. Rev. Lett. 87, 181803 (2001) [5 pages]
Improved Upper Limits on the Flavor-Changing Neutral Current Decays B → Kℓ+ℓ- and B → K*(892)ℓ+ℓ-
S. Anderson et al. (CLEO Collaboration)
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S. Anderson1, V. V. Frolov1, Y. Kubota1, S. J. Lee1, R. Poling1, A. Smith1, C. J. Stepaniak1, J. Urheim1, S. Ahmed2, M. S. Alam2, S. B. Athar2, L. Jian2, L. Ling2, M. Saleem2, S. Timm2, F. Wappler2, A. Anastassov3, E. Eckhart3, K. K. Gan3, C. Gwon3, T. Hart3, K. Honscheid3, D. Hufnagel3, H. Kagan3, R. Kass3, T. K. Pedlar3, J. B. Thayer3, E. von Toerne3, M. M. Zoeller3, S. J. Richichi4, H. Severini4, P. Skubic4, A. Undrus4, V. Savinov5, S. Chen6, J. W. Hinson6, J. Lee6, D. H. Miller6, E. I. Shibata6, I. P. J. Shipsey6, V. Pavlunin6, D. Cronin-Hennessy7, Y. Kwon7 *, A. L. Lyon7, W. Park7, E. H. Thorndike7, T. E. Coan8, Y. S. Gao8, Y. Maravin8, I. Narsky8, R. Stroynowski8, J. Ye8, T. Wlodek8, M. Artuso9, K. Benslama9, C. Boulahouache9, K. Bukin9, E. Dambasuren9, G. Majumder9, R. Mountain9, T. Skwarnicki9, S. Stone9, J. C. Wang9, A. Wolf9, S. Kopp10, M. Kostin10, A. H. Mahmood11, S. E. Csorna12, I. Danko12, K. W. McLean12, Z. Xu12, R. Godang13, G. Bonvicini14, D. Cinabro14, M. Dubrovin14, S. McGee14, A. Bornheim15, G. Eigen15 †, E. Lipeles15, S. P. Pappas15, A. Shapiro15, W. M. Sun15, A. J. Weinstein15, D. E. Jaffe16, R. Mahapatra16, G. Masek16, H. P. Paar16, A. Eppich17, R. J. Morrison17, R. A. Briere18, G. P. Chen18, T. Ferguson18, H. Vogel18, J. P. Alexander19, C. Bebek19, B. E. Berger19, K. Berkelman19, F. Blanc19, V. Boisvert19, D. G. Cassel19, P. S. Drell19, J. E. Duboscq19, K. M. Ecklund19, R. Ehrlich19, P. Gaidarev19, L. Gibbons19, B. Gittelman19, S. W. Gray19, D. L. Hartill19, B. K. Heltsley19, L. Hsu19, C. D. Jones19, J. Kandaswamy19, D. L. Kreinick19, M. Lohner19, A. Magerkurth19, H. Mahlke-Krüger19, T. O. Meyer19, N. B. Mistry19, E. Nordberg19, M. Palmer19, J. R. Patterson19, D. Peterson19, D. Riley19, A. Romano19, H. Schwarthoff19, J. G. Thayer19, D. Urner19, B. Valant-Spaight19, G. Viehhauser19, A. Warburton19, P. Avery20, C. Prescott20, A. I. Rubiera20, H. Stoeck20, J. Yelton20, G. Brandenburg21, A. Ershov21, D. Y.-J. Kim21, R. Wilson21, B. I. Eisenstein22, J. Ernst22, G. E. Gladding22, G. D. Gollin22, R. M. Hans22, E. Johnson22, I. Karliner22, M. A. Marsh22, C. Plager22, C. Sedlack22, M. Selen22, J. J. Thaler22, J. Williams22, K. W. Edwards23,23b, A. J. Sadoff24, R. Ammar25, A. Bean25, D. Besson25, and X. Zhao25 (CLEO Collaboration)
1University of Minnesota, Minneapolis, Minnesota 55455
2State University of New York at Albany, Albany, New York 12222
3The Ohio State University, Columbus, Ohio 43210
4University of Oklahoma, Norman, Oklahoma 73019
5University of Pittsburgh, Pittsburgh, Pennsylvania 15260
6Purdue University, West Lafayette, Indiana 47907
7University of Rochester, Rochester, New York 14627
8Southern Methodist University, Dallas, Texas 75275
9Syracuse University, Syracuse, New York 13244
10University of Texas, Austin, Texas 78712
11University of Texas–Pan American, Edinburg, Texas 78539
12Vanderbilt University, Nashville, Tennessee 37235
13Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
14Wayne State University, Detroit, Michigan 48202
15California Institute of Technology, Pasadena, California 91125
16University of California, San Diego, La Jolla, California 92093
17University of California, Santa Barbara, California 93106
18Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
19Cornell University, Ithaca, New York 14853
20University of Florida, Gainesville, Florida 32611
21Harvard University, Cambridge, Massachusetts 02138
22University of Illinois, Urbana-Champaign, Illinois 61801
23aCarleton University, Ottawa, Ontario, Canada K1S 5B6
23band the Institute of Particle Physics, Canada
24Ithaca College, Ithaca, New York 14850
25University of Kansas, Lawrence, Kansas 66045
Received 14 June 2001; published 15 October 2001
We have searched a sample of 9.6×106 BB̅ events for the flavor-changing neutral current decays B→Kℓ+ℓ- and B→K*(892)ℓ+ℓ-. We subject the latter decay to the requirement that the dilepton mass mℓℓ exceed 0.5 GeV. There is no indication of a signal. We obtain the 90% confidence level upper limits B(B→Kℓ+ℓ-)<1.7×10-6 and B(B→K*(892)ℓ+ℓ-)mℓℓ>0.5 GeV<3.3×10-6. We also obtain an upper limit on the weighted average 0.65B(B→Kℓ+ℓ-)+0.35B(B→K*(892)ℓ+ℓ-)mℓℓ>0.5 GeV<1.5×10-6. The weighted-average limit is only 50% above the standard model prediction.
©2001 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v87/e181803
DOI: 10.1103/PhysRevLett.87.181803
PACS: 13.20.He, 11.30.Hv, 12.15.Mm
* Permanent address: Yonsei University, Seoul 120-749, Korea.
† Permanent address: University of Bergen, 5007 Bergen, Norway.
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