Phys. Rev. D
63,
111102(R)
(2001)
[6 pages]
Measurement of the decay asymmetry parameters in Ξc0→Ξ-π+
S. Chan et al. (CLEO Collaboration)
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S. Chan1, G. Eigen1, E. Lipeles1, J. S. Miller1, M. Schmidtler1, A. Shapiro1, W. M. Sun1, J. Urheim1, A. J. Weinstein1, F. Würthwein1, D. E. Jaffe2, G. Masek2, H. P. Paar2, E. M. Potter2, S. Prell2, V. Sharma2, D. M. Asner3, A. Eppich3, J. Gronberg3, T. S. Hill3, D. J. Lange3, R. J. Morrison3, H. N. Nelson3, T. K. Nelson3, D. Roberts3, B. H. Behrens4, W. T. Ford4, A. Gritsan4, H. Krieg4, J. Roy4, J. G. Smith4, J. P. Alexander5, R. Baker5, C. Bebek5, B. E. Berger5, K. Berkelman5, V. Boisvert5, D. G. Cassel5, D. S. Crowcroft5, M. Dickson5, S. von Dombrowski5, P. S. Drell5, K. M. Ecklund5, R. Ehrlich5, A. D. Foland5, P. Gaidarev5, L. Gibbons5, B. Gittelman5, S. W. Gray5, D. L. Hartill5, B. K. Heltsley5, P. I. Hopman5, D. L. Kreinick5, T. Lee5, Y. Liu5, N. B. Mistry5, C. R. Ng5, E. Nordberg5, M. Ogg5,*, J. R. Patterson5, D. Peterson5, D. Riley5, A. Soffer5, B. Valant-Spaight5, A. Warburton5, C. Ward5, M. Athanas6, P. Avery6, C. D. Jones6, M. Lohner6, C. Prescott6, A. I. Rubiera6, J. Yelton6, J. Zheng6, G. Brandenburg7, R. A. Briere7,†, A. Ershov7, Y. S. Gao7, D. Y.-J. Kim7, R. Wilson7, T. E. Browder8, Y. Li8, J. L. Rodriguez8, H. Yamamoto8, T. Bergfeld9, B. I. Eisenstein9, J. Ernst9, G. E. Gladding9, G. D. Gollin9, R. M. Hans9, E. Johnson9, I. Karliner9, M. A. Marsh9, M. Palmer9, M. Selen9, J. J. Thaler9, K. W. Edwards10, A. Bellerive11, R. Janicek11, P. M. Patel11, A. J. Sadoff12, R. Ammar13, P. Baringer13, A. Bean13, D. Besson13, D. Coppage13, R. Davis13, S. Kotov13, I. Kravchenko13, N. Kwak13, L. Zhou13, S. Anderson14, Y. Kubota14, S. J. Lee14, R. Mahapatra14, J. J. O’Neill14, R. Poling14, T. Riehle14, A. Smith14, M. S. Alam15, S. B. Athar15, Z. Ling15, A. H. Mahmood15, S. Timm15, F. Wappler15, A. Anastassov16, J. E. Duboscq16, K. K. Gan16, C. Gwon16, T. Hart16, K. Honscheid16, H. Kagan16, R. Kass16, J. Lee16, J. Lorenc16, H. Schwarthoff16, A. Wolf16, M. M. Zoeller16, S. J. Richichi17, H. Severini17, P. Skubic17, A. Undrus17, M. Bishai18, S. Chen18, J. Fast18, J. W. Hinson18, N. Menon18, D. H. Miller18, E. I. Shibata18, I. P. J. Shipsey18, S. Glenn19, Y. Kwon19,‡, A. L. Lyon19, S. Roberts19, E. H. Thorndike19, C. P. Jessop20, K. Lingel20, H. Marsiske20, M. L. Perl20, V. Savinov20, D. Ugolini20, X. Zhou20, T. E. Coan21, V. Fadeyev21, I. Korolkov21, Y. Maravin21, I. Narsky21, R. Stroynowski21, J. Ye21, T. Wlodek21, M. Artuso22, E. Dambasuren22, S. Kopp22, G. C. Moneti22, R. Mountain22, S. Schuh22, T. Skwarnicki22, S. Stone22, A. Titov22, G. Viehhauser22, J. C. Wang22, S. E. Csorna23, K. W. McLean23, S. Marka23, Z. Xu23, R. Godang24, K. Kinoshita24,§, I. C. Lai24, P. Pomianowski24, S. Schrenk24, G. Bonvicini25, D. Cinabro25, R. Greene25, L. P. Perera25, and G. J. Zhou25 (CLEO Collaboration)
1California Institute of Technology, Pasadena, California 91125
2University of California, San Diego, La Jolla, California 92093
3University of California, Santa Barbara, California 93106
4University of Colorado, Boulder, Colorado 80309-0390
5Cornell University, Ithaca, New York 14853
6University of Florida, Gainesville, Florida 32611
7Harvard University, Cambridge, Massachusetts 02138
8University of Hawaii at Manoa, Honolulu, Hawaii 96822
9University of Illinois, Urbana-Champaign, Illinois 61801
10Carleton University, Ottawa, Ontario, Canada K1S 5B6the Institute of Particle Physics, Canada
11McGill University, Montréal, Québec, Canada H3A 2T8the Institute of Particle Physics, Canada
12Ithaca College, Ithaca, New York 14850
13University of Kansas, Lawrence, Kansas 66045
14University of Minnesota, Minneapolis, Minnesota 55455
15State University of New York at Albany, Albany, New York 12222
16Ohio State University, Columbus, Ohio 43210
17University of Oklahoma, Norman, Oklahoma 73019
18Purdue University, West Lafayette, Indiana 47907
19University of Rochester, Rochester, New York 14627
20Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
21Southern Methodist University, Dallas, Texas 75275
22Syracuse University, Syracuse, New York 13244
23Vanderbilt University, Nashville, Tennessee 37235
24Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
25Wayne State University, Detroit, Michigan 48202
Received 20 November 2000; published 17 April 2001
Using the CLEO II detector at the Cornell Electron Storage Ring we have measured the Ξc0 decay asymmetry parameter in the decay Ξc0→Ξ-π+. We find αΞc0αΞ=0.26±0.18(stat)-0.04+0.05(syst); using the world average value of αΞ=-0.456±0.014 we obtain αΞc0=-0.56±0.39(stat)-0.09+0.10(syst). The physically allowed range of a decay asymmetry parameter is -1<α<+1. Our result prefers a negative value: αΞc0 is <0.1 at the 90% C.L. The central value occupies the middle of the theoretically expected range but is not yet precise enough to choose between models.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.63.111102
DOI:
10.1103/PhysRevD.63.111102
PACS:
14.20.Lq, 13.30.Eg, 14.20.Jn, 14.65.Dw
*Permanent address: University of Texas, Austin, TX 78712. †Permanent address: Carnegie Mellon University, Pittsburgh, PA 15213. ‡Permanent address: Yonsei University, Seoul 120-749, Korea. §Permanent address: University of Cincinnati, Cincinnati, OH 45221.
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