Measurement of the Michel Parameters and the Average Tau-Neutrino Helicity from Tau Decays at LEP

M Acciarri,O Adriani,M Aguilar-Benitez,S Ahlen,J Alcaraz,G Alemanni,J Allaby,A Aloisio,MG Alviggi,G Ambrosi,H Anderhub,VP Andreev,T Angelescu,F Anselmo, A Arefiev,T Azemoon,T Aziz, P Bagnaia,L Baksay, RC Ball,S Banerjee,K Banicz,A Barczyk, R Barillere,L Barone,P Bartalini, A Baschirotto, M Basile,R Battiston, A Bay, F Becattini,U Becker,F Behner,J Berdugo, P Berges, B Bertucci, BL Betev,S Bhattacharya, M Biasini,A Biland, GM Bilei, JJ Blaising, SC Blyth,GJ Bobbink,R Bock, A Bohm,L Boldizsar,B Borgia,D Bourilkov,M Bourquin, D Boutigny, S Braccini, JG Branson, V Brigljevic, IC Brock, A Buffini,A Buijs, JD Burger, WJ Burger,J Busenitz, XD Cai, M Campanelli,M Capell,GC Romeo,G Carlino,AM Cartacci,J Casaus,G Castellini,F Cavallari, N Cavallo,C Cecchi, M Cerrada, F Cesaroni, M Chamizo, YH Chang, UK Chaturvedi, M Chemarin, A Chen,G Chen,GM Chen, HF Chen, HS Chen, M Chen,G Chiefari, CY Chien,L Cifarelli,F Cindolo,C Civinini,I Clare,R Clare,G Coignet,AP Colijn,N Colino,S Costantini,F Cotorobai, B de la Cruz, A Csilling, TS Dai, R D' Alessandro, R de Asmundis, A Degre,K Deiters, P Denes, F DeNotaristefani, M Diemoz, D van Dierendonck, F Di Lodovico,C Dionisi,M Dittmar,A Dominguez, A Doria, MT Dova,E Drago,D Duchesneau,P Duinker, I Duran,S Easo, H El Mamouni, A Engler, FJ Eppling, FC Erne,P Extermann,M Fabre, R Faccini, MA Falagan,S Falciano,A Favara,J Fay, O Fedin, M Felcini, T Ferguson,F Ferroni,H Fesefeldt,E Fiandrini, JH Field, F Filthaut, PH Fisher, I Fisk,G Forconi,L Fredj, K Freudenreich, C Furetta,Y Galaktionov, SN Ganguli, P Garcia-Abia, M Gataullin, SS Gau, S Gentile, J Gerald, N Gheordanescu,S Giagu,S Goldfarb,J Goldstein, ZF Gong,A Gougas,G Gratta, MW Gruenewald,R van Gulik, VK Gupta,A Gurtu,LJ Gutay, D Haas,B Hartmann,A Hasan,D Hatzifotiadou,T Hebbeker, A Herve, P Hidas,J Hirschfelder, WC van Hoek, H Hofer, H Hoorani, SR Hou, G Hu,I Iashvili, BN Jin, LW Jones, P de Jong, I Josa-Mutuberria, A Kasser, RA Khan, D Kamrad, JS Kapustinsky,Y Karyotakis, M Kaur, MN Kienzle-Focacci, D Kim, DH Kim, JK Kim, SC Kim, WW Kinnison, A Kirkby, D Kirkby,J Kirkby, D Kiss,W Kittel,A Klimentov, AC Konig, A Kopp, I Korolko,V Koutsenko, RW Kraemer,W Krenz,A Kunin,P Lacentre, PL de Guevara, G Landi, C Lapoint, K Lassila-Perini, P Laurikainen, A Lavorato, M Lebeau, A Lebedev, P Lebrun, P Lecomte, P Lecoq, P Le Coultre, HJ Lee,C Leggett, JM Le Goff, R Leiste,E Leonardi, P Levtchenko, C Li, CH Lin, WT Lin, FL Linde,L Lista, ZA Liu, W Lohmann, E Longo, W Lu, YS Lu, K Lubelsmeyer,C Luci, D Luckey, L Luminari, W Lustermann, WG Ma, M Maity, G Majumder, L Malgeri, A Malinin, C Mana, D Mangeol, P Marchesini,G Marian, A Marin, JP Martin, F Marzano, GGG Massaro,K Mazumdar, S Mele, L Merola, M Meschini, WJ Metzger, M von der Mey, Y Mi, D Migani,A Mihul, AJW van Mil, H Milcent,G Mirabelli,J Mnich,P Molnar,B Monteleoni,R Moore, T Moulik, R Mount, GS Muanza, F Muheim, AJM Muijs, S Nahn, M Napolitano, F Nessi-Tedaldi, H Newman, T Niessen, A Nippe, A Nisati, H Nowak, YD Oh, G Organtini, R Ostonen, C Palomares, D Pandoulas, S Paoletti, P Paolucci, HK Park, IH Park, G Pascale, G Passaleva, S Patricelli, T Paul, M Pauluzzi, C Paus, F Pauss, D Peach, M Pedace, YJ Pei, S Pensotti, D Perret-Gallix, B Petersen, S Petrak, A Pevsner, D Piccolo, M Pieri, PA Piroue, E Pistolesi, V Plyaskin, M Pohl, V Pojidaev, H Postema, J Pothier, N Produit, D Prokofiev, J Quartieri, G Rahal-Callot, N Raja, PG Rancoita, M Rattaggi, G Raven, P Razis, D Ren, M Rescigno, S Reucroft, T van Rhee, S Riemann, K Riles, O Rind, A Robohm, J Rodin, BP Roe, L Romero, S Rosier-Lees, P Rosselet, S Roth, JA Rubio, D Ruschmeier, H Rykaczewski, S Sakar, J Salicio, E Sanchez, MP Sanders, ME Sarakinos, G Sauvage, C Schafer, V Schegelsky, S Schmidt-Kaerst, D Schmitz, M Schneegans, N Scholz, H Schopper, DJ Schotanus, J Schwenke, G Schwering, C Sciacca, D Sciarrino, L Servoli, S Shevchenko, N Shivarov, V Shoutko, J Shukla, E Shumilov, A Shvorob, T Siedenburg, D Son, V Soulimov, B Smith, P Spillantini, M Steuer, DP Stickland, H Stone, B Stoyanov, A Straessner, K Sudhakar, G Sultanov, LZ Sun, FG Susinno, H Suter, JD Swain, XW Tang, L Tauscher, L Taylor, C Timmermans, SCC Ting, SM Ting, SC Tonwar, J Toth, C Tully, KL Tung, Y Uchida, J Ulbricht, E Valente, G Vesztergombi, I Vetlitsky, G Viertel, S Villa, M Vivargent, S Vlachos, H Vogel, H Vogt, I Vorobiev, AA Vorobyov, A Vorvolakos, M Wadhwa, W Wallraff, JC Wang, XL Wang, ZM Wang, A Weber, SX Wu, S Wynhoff, J Xu, ZZ Xu, BZ Yang, CG Yang, HJ Yang, M Yang, JB Ye, SC Yeh, JM You, A Zalite, Y Zalite, P Zemp, Y Zeng, ZP Zhang, B Zhou, Y Zhou, GY Zhu, RY Zhu, A Zichichi,F Ziegler, G Zilizi

Physics letters B（1998）

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摘要

Four of the Michel parameters and the average tau-neutrino helicity have been measured by analysing tau decay spectra in 147 pb 1 of data collected by the L3 detector. The decays ! e e, ! , ! , ! and their charge conjugates were considered. The results: = 0:762 0:035, = 0:27 0:14, = 0:70 0:16, = 0:70 0:11 and h = 1:032 0:031 are consistent with a V A structure for the weak charged current and lepton universality. Submitted to Phys. Lett. B

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