ντ helicity from h± energy correlations

T. Coan,V. Fadeyev, I. Korolkov, Y. Maravin,I. Narsky,V. Shelkov,J. Staeck, R. Stroynowski, I. Volobouev,J. Ye,M. Artuso,A. Efimov,F. Frasconi,M. Gao,M. Goldberg,D. He,S. Kopp,G. Moneti,R. Mountain,S. Schuh,T. Skwarnicki,S. Stone,G. Viehhauser, X. Xing, J. Bartelt, S. Csorna,V. Jain,S. Marka,A. Freyberger, R. Godang,K. Kinoshita,I. Lai,P. Pomianowski,S. Schrenk,G. Bonvicini,D. Cinabro,R. Greene,L. Perera,G. Zhou,B. Barish,M. Chadha,S. Chan,G. Eigen,J. Miller,C. O’Grady,M. Schmidtler,J. Urheim,A. Weinstein, F. Würthwein,D. Asner,D. Bliss, W. Brower, G. Masek, H. Paar,V. Sharma, J. Gronberg,T. Hill,R. Kutschke,D. Lange, S. Menary,R. Morrison,H. Nelson,T. Nelson,C. Qiao,J. Richman,D. Roberts, A. Ryd,M. Witherell,R. Balest,B. Behrens,K. Cho,W. Ford,H. Park,P. Rankin,J. Roy,J. Smith, J. Alexander,C. Bebek,B. Berger,K. Berkelman,K. Bloom,D. Cassel,H. Cho,D. Coffman,D. Crowcroft,M. Dickson, P. Drell, K. Ecklund,R. Ehrlich,R. Elia,A. Foland,P. Gaidarev,R. Galik,B. Gittelman, S. Gray,D. Hartill, B. Heltsley,P. Hopman,J. Kandaswamy,N. Katayama, P. Kim,D. Kreinick,T. Lee, Y. Liu,G. Ludwig,J. Masui,J. Mevissen,N. Mistry,C. Ng, E. Nordberg,M. Ogg,J. Patterson, D. Peterson, D. Riley, A. Soffer,C. Ward,M. Athanas, P. Avery,C. Jones, M. Lohner, C. Prescott, J. Yelton, J. Zheng, G. Brandenburg, R. Briere, Y. Gao,D. Kim,R. Wilson,H. Yamamoto, T. Browder,F. Li, Y. Li, J. Rodriguez,T. Bergfeld,B. Eisenstein, J. Ernst,G. Gladding, G. Gollin,R. Hans,E. Johnson, I. Karliner,M. Marsh,M. Palmer,M. Selen,J. Thaler, K. Edwards, A. Bellerive,R. Janicek, D. MacFarlane,K. McLean,P. Patel,A. Sadoff,R. Ammar,P. Baringer,A. Bean, D. Besson,D. Coppage,C. Darling,R. Davis,N. Hancock,S. Kotov,I. Kravchenko,N. Kwak,S. Anderson,Y. Kubota, M. Lattery, S. Lee,J. O’Neill,S. Patton,R. Poling,T. Riehle, V. Savinov, A. Smith,M. Alam,S. Athar,Z. Ling,A. Mahmood, H. Severini,S. Timm,F. Wappler, A. Anastassov,S. Blinov,J. Duboscq,K. Fisher,D. Fujino,R. Fulton,K. Gan, T. Hart,K. Honscheid, H. Kagan, R. Kass, J. Lee,M. Spencer,M. Sung, A. Undrus,R. Wanke, A. Wolf, M. Zoeller,B. Nemati,S. Richichi,W. Ross, P. Skubic,M. Wood,M. Bishai,J. Fast,E. Gerndt,J. Hinson,N. Menon,D. Miller, E. Shibata, I. Shipsey, M. Yurko, L. Gibbons,S. Johnson,Y. Kwon,S. Roberts,E. Thorndike,C. Jessop,K. Lingel,H. Marsiske,M. Perl,S. Schaffner, D. Ugolini,R. Wang,X. Zhou

PHYSICAL REVIEW D（1997）

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摘要

We report a measurement of the magnitude of the nu(tau) helicity from tau-pair events taken with the CLEO detector at the CESR electron-positron storage ring. Events in which each tau undergoes the decay tau-->h nu, with h a charged pion or kaon, are analyzed for energy correlations between the daughter hadrons, yielding \xi(h)\ = 1.03 +/- 0.06 +/- 0.04, with the first error statistical and the second systematic.

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