Determination of the Michel Parameters and the τ Neutrino Helicity in τ Decay-猫眼课题宝

米歇尔参数和τ衰变中微子螺旋度的测定

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2003

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J. Alexander;C. Bebek;B. Berger;K. Berkelman;K. Bloom;D. Cassel;H. Cho;D. Coffman;D. S. 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;P. Kim;D. Kreinick;T. Lee;Yehan Liu;G. S. Ludwig;J. Masui;J. Mevissen;N. Mistry;C. Ng;E. Nordberg;M. Ogg;J. Patterson;D. Peterson;D. Riley;A. Soffer;B. Valant;C. Ward;M. Athanas;P. Avery;C. Jones;M. Lohner;C. Prescott;J. Yelton;J. Zheng;G. Brandenburg;R. Briere;Y. Gao;D. Kim;Richard K. Wilson;H. Yamamoto;T. Browder;F. Li;Yan Li;Javier Rodriguez;T. Bergfeld;B. Eisenstein;J. Ernst;G. Gladding;G. Gollin;R. M. Hans;E. Johnson;I. Karliner;M. A. Marsh;M. Palmer;M. Selen;J. Thaler;K. W. Edwards;A. Bellerive;R. Janicek;D. MacFarlane;K. W. 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. J. 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. D. Fisher;D. Fujino;K. Gan;T. Hart;K. Honscheid;H. Kagan;R. Kass;Jongseo Lee;M. B. 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. W. Hinson;N. Menon;D. Miller;E. Shibata;I. Shipsey;M. Yurko;L. Gibbons;S. Glenn;S. D. Johnson;Youngjoon Kwon;S. Roberts;E. Thorndike;C. Jessop;K. Lingel;H. Marsiske;M. Perl;D. Ugolini;Raymond Wang;Xingjiang Zhou;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. Márka;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;S. Prell;V. Sharma;J. Gronberg;T. Hill;R. Kutschke;D. Lange;S. Menary;R. J. Morrison;H. Nelson;T. Nelson;C. Qiao;J. Richman;D. Roberts;A. Ryd;M. Witherell;R. Balest;B. Behrens;K. Cho;W. Ford;Harold S. Park;P. Rankin;J. Roy;J. Smith

在ee储存环CESR上用CLEO Ⅱ探测器测量了τ → lνν衰变的Michel参数ρ、τ、δ和τ → ππν衰变的τ中微子螺旋度参数hντ。从在10.6 GeV产生的3.02 × 10 τ对的数据样本中，使用拓扑ee → τ →（lνν）（ππν）和ee → τ →（ππν）（π πν）的事件，以及确定的hντ [1，2]的符号，三个样本的组合结果是：ρ = 0.747±0.010±0.006，ε = 1.007±0.040±0.015，δ = 0.745±0.026±0.009，hντ = −0.995±0.010±0.003。结果与标准模型V-A相互作用一致.使用REVTEX打字

Using the CLEO II detector at the ee storage ring CESR, we have determined the Michel parameters ρ, ξ, and δ in τ → lνν decay as well as the τ neutrino helicity parameter hντ in τ ∓ → ππν decay. From a data sample of 3.02 × 10 τ pairs produced at √s = 10.6 GeV, using events of the topology ee → ττ → (lνν)(ππν) and ee → ττ → (ππν)(ππν), and the determined sign of hντ [1,2], the combined result of the three samples is: ρ = 0.747±0.010±0.006, ξ = 1.007±0.040±0.015, ξδ = 0.745±0.026±0.009, and hντ = −0.995±0.010±0.003. The results are in agreement with the Standard Model V -A interaction. Typeset using REVTEX

Determination of the Michel Parameters and the τ Neutrino Helicity in τ Decay

米歇尔参数和τ衰变中微子螺旋度的测定

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