Phys. Rev. Lett.
87,
271801
(2001)
[5 pages]
Search for the Familon via B±→π±X0, B±→K±X0, and B0→KS0X0 Decays
R. Ammar et al. (CLEO Collaboration)
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R. Ammar1, A. Bean1, D. Besson1, X. Zhao1, S. Anderson2, V. V. Frolov2, Y. Kubota2, S. J. Lee2, R. Poling2, A. Smith2, C. J. Stepaniak2, J. Urheim2, S. Ahmed3, M. S. Alam3, S. B. Athar3, L. Jian3, L. Ling3, M. Saleem3, S. Timm3, F. Wappler3, A. Anastassov4, E. Eckhart4, K. K. Gan4, C. Gwon4, T. Hart4, K. Honscheid4, D. Hufnagel4, H. Kagan4, R. Kass4, T. K. Pedlar4, J. B. Thayer4, E. von Toerne4, M. M. Zoeller4, S. J. Richichi5, H. Severini5, P. Skubic5, A. Undrus5, V. Savinov6, S. Chen7, J. W. Hinson7, J. Lee7, D. H. Miller7, V. Pavlunin7, E. I. Shibata7, I. P. J. Shipsey7, D. Cronin-Hennessy8, A. L. Lyon8, E. H. Thorndike8, T. E. Coan9, V. Fadeyev9, Y. S. Gao9, Y. Maravin9, I. Narsky9, R. Stroynowski9, J. Ye9, T. Wlodek9, M. Artuso10, K. Benslama10, C. Boulahouache10, K. Bukin10, E. Dambasuren10, G. Majumder10, R. Mountain10, T. Skwarnicki10, S. Stone10, J. C. Wang10, A. Wolf10, S. Kopp11, M. Kostin11, A. H. Mahmood12, S. E. Csorna13, I. Danko13, K. W. McLean13, Z. Xu13, R. Godang14, G. Bonvicini15, D. Cinabro15, M. Dubrovin15, S. McGee15, A. Bornheim16, E. Lipeles16, S. P. Pappas16, A. Shapiro16, W. M. Sun16, A. J. Weinstein16, D. E. Jaffe17, R. Mahapatra17, G. Masek17, H. P. Paar17, D. M. Asner18, A. Eppich18, T. S. Hill18, R. J. Morrison18, R. A. Briere19, G. P. Chen19, T. Ferguson19, H. Vogel19, J. P. Alexander20, C. Bebek20, B. E. Berger20, K. Berkelman20, F. Blanc20, V. Boisvert20, D. G. Cassel20, P. S. Drell20, J. E. Duboscq20, K. M. Ecklund20, R. Ehrlich20, P. Gaidarev20, L. Gibbons20, B. Gittelman20, S. W. Gray20, D. L. Hartill20, B. K. Heltsley20, L. Hsu20, C. D. Jones20, J. Kandaswamy20, D. L. Kreinick20, M. Lohner20, A. Magerkurth20, H. Mahlke-Krüger20, T. O. Meyer20, N. B. Mistry20, E. Nordberg20, M. Palmer20, J. R. Patterson20, D. Peterson20, D. Riley20, A. Romano20, H. Schwarthoff20, J. G. Thayer20, D. Urner20, B. Valant-Spaight20, G. Viehhauser20, A. Warburton20, P. Avery21, C. Prescott21, A. I. Rubiera21, H. Stoeck21, J. Yelton21, G. Brandenburg22, A. Ershov22, D. Y.-J. Kim22, R. Wilson22, B. I. Eisenstein23, J. Ernst23, G. E. Gladding23, G. D. Gollin23, R. M. Hans23, E. Johnson23, I. Karliner23, M. A. Marsh23, C. Plager23, C. Sedlack23, M. Selen23, J. J. Thaler23, J. Williams23, K. W. Edwards24a,24b, and A. J. Sadoff25 (CLEO Collaboration)
1University of Kansas, Lawrence, Kansas 66045
2University of Minnesota, Minneapolis, Minnesota 55455
3State University of New York at Albany, Albany, New York 12222
4The Ohio State University, Columbus, Ohio 43210
5University of Oklahoma, Norman, Oklahoma 73019
6University of Pittsburgh, Pittsburgh, Pennsylvania 15260
7Purdue University, West Lafayette, Indiana 47907
8University of Rochester, Rochester, New York 14627
9Southern Methodist University, Dallas, Texas 75275
10Syracuse University, Syracuse, New York 13244
11University of Texas, Austin, Texas 78712
12University of Texas–Pan American, Edinburg, Texas 78539
13Vanderbilt University, Nashville, Tennessee 37235
14Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
15Wayne State University, Detroit, Michigan 48202
16California Institute of Technology, Pasadena, California 91125
17University of California, San Diego, La Jolla, California 92093
18University of California, Santa Barbara, California 93106
19Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
20Cornell University, Ithaca, New York 14853
21University of Florida, Gainesville, Florida 32611
22Harvard University, Cambridge, Massachusetts 02138
23University of Illinois, Urbana-Champaign, Illinois 61801
24aCarleton University, Ottawa, Ontario, Canada K1S 5B6
24band the Institute of Particle Physics, Canada
25Ithaca College, Ithaca, New York 14850
Received 6 June 2001; published 11 December 2001
We have searched for the two-body decay of the B meson to a light pseudoscalar meson h = π±,K±,KS0 and a massless neutral feebly interacting particle X0 such as the familon, the Nambu-Goldstone boson associated with a spontaneously broken global family symmetry. We find no significant signal by analyzing a data sample containing 9.7×106 BB̅ mesons collected with the CLEO detector at the Cornell Electron Storage Ring, and set 90% C.L. upper limits B(B±→h±X0) = 4.9×10-5 and B(B0→KS0X0) = 5.3×10-5. These limits correspond to a lower bound of approximately 108GeV on the family symmetry breaking scale with vector coupling involving the third generation of quarks.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.271801
DOI:
10.1103/PhysRevLett.87.271801
PACS:
14.80.Mz, 11.30.Qc, 13.25.Hw
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