Phys. Rev. Lett. 81, 3823 - 3827 (1998)
First Search for CP Violation in Tau Lepton Decay
S. Anderson et al. (CLEO Collaboration)
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S. Anderson1, Y. Kubota1, S. J. Lee1, J. J. O'Neill1, R. Poling1, T. Riehle1, A. Smith1, M. S. Alam2, S. B. Athar2, Z. Ling2, A. H. Mahmood2, S. Timm2, F. Wappler2, A. Anastassov3, J. E. Duboscq3, D. Fujino3 *, K. K. Gan3, T. Hart3, K. Honscheid3, H. Kagan3, R. Kass3, J. Lee3, H. Schwarthoff3, M. B. Spencer3, M. Sung3, A. Undrus3 †, A. Wolf3, M. M. Zoeller3, S. J. Richichi4, H. Severini4, P. Skubic4, M. Bishai5, J. Fast5, J. W. Hinson5, N. Menson5, D. H. Miller5, E. I. Shibata5, I. P. J. Shipsey5, M. Yurko5, S. Glenn6, Y. Kwon6 ‡, A. L. Lyon6, S. Roberts6, E. H. Thorndike6, C. P. Jessop7, K. Lingel7, H. Marsiske7, M. L. Perl7, V. Savinov7, D. Ugolini7, X. Zhou7, T. E. Coan8, V. Fadeyev8, I. Korolkov8, Y. Maravin8, I. Narsky8, V. Shelkov8, J. Staeck8, R. Stroynowski8, I. Volobouev8, J. Ye8, M. Artuso9, F. Azfar9, A. Efimov9, M. Goldberg9, D. He9, S. Kopp9, G. C. Moneti9, R. Mountain9, S. Schuh9, T. Skwarnicki9, S. Stone9, G. Viehhauser9, J. C. Wang9, X. Xing9, J. Bartelt10, S. E. Csorna10, V. Jain10 §, K. W. McLean10, S. Marka10, R. Godang11, K. Kinoshita11, I. C. Lai11, P. Pomianowski11, S. Schrenk11, G. Bonvicini12, D. Cinabro12, R. Greene12, L. P. Perera12, G. J. Zhou12, M. Chadha13, S. Chan13, G. Eigen13, J. S. Miller13, M. Schmidtler13, J. Urheim13, A. J. Weinstein13, F. Würthwein13, D. W. Bliss14, D. E. Jaffe14, G. Masek14, H. P. Paar14, E. M. Potter14, S. Prell14, V. Sharma14, D. M. Asner15, J. Gronberg15, T. S. Hill15, D. J. Lange15, R. J. Morrison15, H. N. Nelson15, T. K. Nelson15, D. Roberts15, B. H. Behrens16, W. T. Ford16, A. Gritsan16, J. Roy16, J. G. Smith16, J. P. Alexander17, R. Baker17, C. Bebek17, B. E. Berger17, K. Berkelman17, K. Bloom17, V. Boisvert17, D. G. Cassel17, D. S. Crowcroft17, M. Dickson17, S. von Dombrowski17, P. S. Drell17, K. M. Ecklund17, R. Ehrlich17, A. D. Foland17, P. Gaidarev17, L. Gibbons17, B. Gittelman17, S. W. Gray17, D. L. Hartill17, B. K. Heltsley17, P. I. Hopman17, J. Kandaswamy17, D. L. Kreinick17, T. Lee17, Y. Liu17, N. B. Mistry17, C. R. Ng17, E. Nordberg17, M. Ogg17 **, J. R. Patterson17, D. Peterson17, D. Riley17, A. Soffer17, B. Valant-Spaight17, C. Ward17, M. Athanas18, P. Avery18, C. D. Jones18, M. Lohner18, S. Patton18, C. Prescott18, J. Yelton18, J. Zheng18, G. Brandenburg19, R. A. Briere19, A. Ershov19, Y. S. Gao19, D. Y.-J. Kim19, R. Wilson19, H. Yamamoto19, T. E. Browder20, Y. Li20, J. L. Rodriguez20, S. K. Sahu20, T. Bergfeld21, B. I. Eisenstein21, J. Ernst21, G. E. Gladding21, G. D. Gollin21, R. M. Hans21, E. Johnson21, I. Karliner21, M. A. Marsh21, M. Palmer21, M. Selen21, J. J. Thaler21, K. W. Edwards22,22b, A. Bellerive23,23b, R. Janicek23,23b, D. B. MacFarlane23,23b, P. M. Patel23,23b, A. J. Sadoff24, R. Ammar25, P. Baringer25, A. Bean25, D. Besson25, D. Coppage25, C. Darling25, R. Davis25, S. Kotov25, I. Kravchenko25, N. Kwak25, and L. Zhou25 (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
5Purdue University, West Lafayette, Indiana 47907
6University of Rochester, Rochester, New York 14627
7Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
8Southern Methodist University, Dallas, Texas 75275
9Syracuse University, Syracuse, New York 13244
10Vanderbilt University, Nashville, Tennessee 37235
11Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
12Wayne State University, Detroit, Michigan 48202
13California Institute of Technology, Pasadena, California 91125
14University of California, San Diego, La Jolla, California 92093
15University of California, Santa Barbara, California 93106
16University of Colorado, Boulder, Colorado 80309-0390
17Cornell University, Ithaca, New York 14853
18University of Florida, Gainesville, Florida 32611
19Harvard University, Cambridge, Massachusetts 02138
20University of Hawaii at Manoa, Honolulu, Hawaii 96822
21University of Illinois, Urbana-Champaign, Illinois 61801
22aCarleton University, Ottawa, Ontario, Canada K1S 5B6
22band the Institute of Particle Physics, Montréal, Québec, Canada
23aMcGill University, Montréal, Québec, Canada H3A 2T8
23band the Institute of Particle Physics, Montréal, Québec, Canada
24Ithaca College, Ithaca, New York 14850
25University of Kansas, Lawrence, Kansas 66045
Received 21 May 1998
We have performed the first search for CP violation in tau lepton decay. CP violation in lepton decay does not occur in the minimal standard model but can occur in extensions such as the multi-Higgs doublet model. It appears as a characteristic difference between the τ- and τ+ decay angular distributions for the semileptonic decay modes such as τ-→K0π-ν. We define an observable asymmetry to exploit this and find no evidence for any CP violation.
©1998 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevLett.81.3823
DOI: 10.1103/PhysRevLett.81.3823
PACS: 13.35.Dx, 11.30.Er, 12.60.Fr, 14.60.Fg
* Permanent address: Lawrence Livermore National Laboratory, Livermore, CA 94551.
† Permanent address: BINP, RU-630090 Novosibirsk, Russia.
‡ Permanent address: Yonsei University, Seoul 120-749, Korea.
§ Permanent address: Brookhaven National Laboratory, Upton, NY 11973.
** Permanent address: University of Texas, Austin, TX 78712.
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