Phys. Rev. Lett.
89,
171803
(2002)
[5 pages]
Observation of the Decay Ωc0→Ω-e+νe
R. Ammar et al. CLEO Collaboration
Show All Authors/Affiliations
Hide All Authors/Affiliations
R. Ammar1, D. Besson1, X. Zhao1, S. Anderson2, V. V. Frolov2, Y. Kubota2, S. J. Lee2, S. Z. Li2, R. Poling2, A. Smith2, C. J. Stepaniak2, J. Urheim2, S. Ahmed3, M. S. Alam3, L. Jian3, M. Saleem3, F. Wappler3, 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, T. Wilksen4, M. M. Zoeller4, H. Muramatsu5, S. J. Richichi5, H. Severini5, P. Skubic5, S. A. Dytman6, S. Nam6, 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, C. S. Park8, W. Park8, E. H. Thorndike8, T. E. Coan9, Y. S. Gao9, F. Liu9, Y. Maravin9, I. Narsky9, R. Stroynowski9, M. Artuso10, C. Boulahouache10, K. Bukin10, E. Dambasuren10, R. Mountain10, T. Skwarnicki10, S. Stone10, J. C. Wang10, A. H. Mahmood11, S. E. Csorna12, I. Danko12, Z. Xu12, G. Bonvicini13, D. Cinabro13, M. Dubrovin13, S. McGee13, A. Bornheim14, E. Lipeles14, S. P. Pappas14, A. Shapiro14, W. M. Sun14, A. J. Weinstein14, G. Masek15, H. P. Paar15, R. Mahapatra16, R. A. Briere17, G. P. Chen17, T. Ferguson17, G. Tatishvili17, H. Vogel17, N. E. Adam18, J. P. Alexander18, K. Berkelman18, F. Blanc18, V. Boisvert18, D. G. Cassel18, P. S. Drell18, J. E. Duboscq18, K. M. Ecklund18, R. Ehrlich18, L. Gibbons18, B. Gittelman18, S. W. Gray18, D. L. Hartill18, B. K. Heltsley18, L. Hsu18, C. D. Jones18, J. Kandaswamy18, D. L. Kreinick18, A. Magerkurth18, H. Mahlke-Krüger18, T. O. Meyer18, N. B. Mistry18, E. Nordberg18, J. R. Patterson18, D. Peterson18, J. Pivarski18, D. Riley18, A. J. Sadoff18, H. Schwarthoff18, M. R. Shepherd18, J. G. Thayer18, D. Urner18, B. Valant-Spaight18, G. Viehhauser18, A. Warburton18, M. Weinberger18, S. B. Athar19, P. Avery19, L. Breva-Newell19, V. Potlia19, H. Stoeck19, J. Yelton19, G. Brandenburg20, A. Ershov20, D. Y.-J. Kim20, R. Wilson20, K. Benslama21, B. I. Eisenstein21, J. Ernst21, G. D. Gollin21, R. M. Hans21, I. Karliner21, N. Lowrey21, M. A. Marsh21, C. Plager21, C. Sedlack21, M. Selen21, J. J. Thaler21, J. Williams21, and K. W. Edwards22 (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–Pan American, Edinburg, Texas 78539
12Vanderbilt University, Nashville, Tennessee 37235
13Wayne State University, Detroit, Michigan 48202
14California Institute of Technology, Pasadena, California 91125
15University of California, San Diego, La Jolla, California 92093
16University of California, Santa Barbara, California 93106
17Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
18Cornell University, Ithaca, New York 14853
19University of Florida, Gainesville, Florida 32611
20Harvard University, Cambridge, Massachusetts 02138
21University of Illinois, Urbana-Champaign, Illinois 61801
22Carleton University, Ottawa, Ontario, Canada K1S 5B6 and the Institute of Particle Physics, Canada M5S 1A7
Received 5 June 2002; published 7 October 2002
Using the CLEO detector at the Cornell Electron Storage Ring we have observed the Ωc0 (css ground state) in the decay Ωc0→Ω-e+νe. We find a signal of 11.4±3.8(stat) events. The probability that we have observed a background fluctuation is 7.6×10-5. We measure B(Ωc0→Ω-e+νe)·σ(e+e-→Ωc0X)=(42.2±14.1(stat)±5.7(syst)) fb and R=Γ(Ωc0→Ω-π+)/Γ(Ωc0→Ω-eνe)=00.41±0.19(stat)±0.04(syst). This is the first statistically significant observation of an individual decay mode of the Ωc0 in e+e- annihilation and the first example of a baryon decaying via β emission, where no quarks from the first generation participate in the reaction.
© 2002 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.171803
DOI:
10.1103/PhysRevLett.89.171803
PACS:
13.30.Ce, 14.20.Lq, 14.65.Dw
|
|
