Determination of the Michel parameters and the τ neutrino helicity in τ decay

J P Alexander,C Bebek,B E Berger,K Berkelman,K Bloom, D G Cassel,H A Cho,D M Coffman,D S Crowcroft,M Dickson, P S Drell,K M Ecklund,Rodney I Ehrlich,R Elia,A Foland,P Gaidarev, R S Galik, B Gittelman,S W Gray, D L Hartill, B K Heltsley, P I Hopman,J Kandaswamy,P C Kim,D L Kreinick,Taeho Lee,Yongmin Liu,G S Ludwig,J Masui,J Mevissen,N B Mistry,C R Ng, E Nordberg,M Ogg,J R Patterson, D Peterson,D Riley, A Soffer,B Valantspaight,C P Ward,M Athanas, P Avery,C D Jones,M Lohner, C Prescott, J Yelton,Jing Zheng,G Brandenburg,R A Briere, Y S Gao,D Y J Kim,R J Wilson,Hiroshi Yamamoto,T E Browder,F Li, Yuan Li,J L Rodriguez,T Bergfeld,B I Eisenstein,J Ernst,Gary E Gladding,J Fast, E Gerndt,J W Hinson,N Menon,D H Miller,E I Shibata, I P J Shipsey,G D Gollin,R M Hans,Eric J Johnson,I Karliner,M A Marsh, M Yurko, L Gibbons,M J Palmer, M Selen,J J Thaler,K W Edwards,S Glenn,Scott Johnson,Youngwoo Kwon,A Bellerive,Stefan G E Roberts,J Urheim,M Schmidtler,C O Grady,R Janicek,D B Macfarlane,Jeremy S Miller,E H Thorndike,C P Jessop,K Lingel, G Eigen,S Chan,K W Mclean,P M Patel,A J Sadoff,R Ammar,P Baringer,M Chadha,B C Barish,G J Zhou, Lalith Perera,R L Greene,D Cinabro,A Bean,D Besson,D Coppage,C Darling,R Davis,N Hancock,S Kotov, G Bonvicini,I Kravchenko,N Kwak,S Anderson,Yasushi Kubota,M Lattery,S J Lee,J J O Neill,S Patton,R Poling,T Riehle,S Schrenk,P Pomianowski,I C Lai, V Savinov, A Smith,M S Alam,S B Athar,Zhenhua Ling,A H Mahmood, H Severini, S Timm,F R Wappler, A Anastassov,S Blinov,J E Duboscq,Kerry D Fisher,D Fujino,K K Gan, Timothy K Hart, K Honscheid,H Kagan, R Kass, J Lee,M B Spencer,M Sung, A Undrus,R Wanke,Alfred P Wolf,H Marsiske,M Artuso,Jingbo Ye, M M Zoeller,B Nemati,S J Richichi,W R Ross,P Skubic,K Kinoshita, Michael Wood,M Bishai,R Godang,S Marka,V Jain,S E Csorna, J Bartelt,Xiwen Xing,G H A Viehhauser,S Stone, T Skwarnicki,S Schuh, I Volobouev, R Stroynowski,J Staeck, V G Shelkov,I Narsky,Y Maravin, I Korolkov, R Mountain, G C Moneti,S Kopp,V Fadeyev,Deyan He,T E Coan,Michael J Goldberg,Mingxia Gao,B H Behrens,K Cho, W T Ford,H Park,F Frasconi,P Rankin,J Roy, J G Smith,A Efimov, D Ugolini,Ruiwu Wang,Xin Zhou,M Perl,A J Weinstein,F Wurthwein,D M Asner,Daniel W Bliss, T S Hill,Robert Kenneth Kutschke,D J Lange,W S Brower, G E Masek,H P Paar,S Prell,Vivek Sharma, J Gronberg,S Menary,R J Morrison,Harry Norman Nelson,T K Nelson,C Qiao, J D Richman,D A Roberts, A Ryd,Michael S Witherell, R Balest

PHYSICAL REVIEW D（1997）

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摘要

Using the CLEO II detector at the Cornell Electron Storage Ring operated at root s=10.6 GeV, we have determined the Michel parameters rho, xi and delta in tau(-/+)-->l(-/+) nu<(nu)over bar> decay as well as the tau neutrino helicity parameter h(nu tau) in tau(-/+)-->pi(-/+)pi(0) nu decay. From a data sample of 3.02x10(6) produced tau pairs we analyzed events of the topologies e(+)e(-)-->tau(+)tau(-)-->(l(+/-)nu<(nu)over bar>)(pi(-/+)pi(0) nu) and e(+)e(-)-->tau(+)tau(-)-->(pi(+/-)pi(0)<(nu)over bar>)pi(-/+)pi(0) nu). We obtain rho=0.747 rho =0.747+/-0.010+/-0.006, xi=1.007+/-0.040+/-0.015, xi delta=0.745+/-0.026+/-0.009, and h(nu tau)=-0.995+/-0.010 +/-0.003, when we have used the previously determined sign of h(nu tau) [ARGUS Collaboration, H. Albrecht et al., Z. Phys. C 58, 61 (1993); Phys. Lett. B 349, 576 (1995)]. We also present the Michel parameters as determined from the electron and muon samples separately. All results are in agreement with the standard model V-A interaction.

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