Search for heavy neutral and charged leptons in e+e- annihilation at √s = 161 and √s = 172 GeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

Volumn 412, Issue 1-2, 1997, Pages 189-200

  Acciarri, M ^ac   Adriani, O ^r   Aguilar Benitez, M ^ab   Ahlen, S ^l   Alcaraz, J ^ab   Alemanni, G ^x   Allaby, J ^s   Aloisio, A ^ae   Alverson, G ^m   Alviggi, M G ^ae   Ambrosi, G ^u   Anderhub, H ^ay   Andreev, V P ^g,an   Angelescu, T ⁿ   Anselmo, F ^j   Arefiev, A ^ad   Azemoon, T ^c   Aziz, T ^k   Bagnaia, P ^am   Baksay, L ^at   Banerjee, S ^k,k   Banicz, K ^av   Barczyk, A ^aw,ay   Barillere R ^s   Barone, L ^am   Bartalini, P ^aj   Baschirotto, A ^ac   Basile, M ^j   Battiston, R ^aj   Bay, A ^x   Becattini, F ^r   Becker, U ^q   Behner, F ^ay   Berdugo, J ^ab   Berges, P ^q   Bertucci, B ^aj   Betev, B L ^ay   Bhattacharya, S ^k   Biasini, M ^s   Biland, A ^ay   Bilei, G M ^aj   Blaising, J J ^d   Blyth, S C ^ak   Bobbink, G J ^b   Bock, R ^a   Bohm A ^a   Boldizsar, L ^o   Borgia, B ^am   Bourilkov, D ^ay   Bourquin, M ^u   Braccini, S ^u   Branson, J G ^ap   Brigljevic, V ^ay   Brock, I C ^ak   Buffini, A ^r   Buijs, A ^au   Burger, J D ^q   Burger, W J ^u   Busenitz, J ^at   Button, A ^c   Cai, X D ^q   Campanelli, M ^ay   Capell, M ^q   Cara Romeo, G ^j   Carlino, G ^ae   Cartacci, A M ^r   Casaus, J ^ab   Castellini, G ^r   Cavallari, F ^am   Cavallo, N ^ae   Cecchi, C ^u   Cerrada, M ^ab   Cesaroni, F ^y   Chamizo, M ^ab   Chang, Y H ^ba   Chaturvedi, U K ^t   Chekanov, S V ^ag   Chemarin, M ^aa   Chen, A ^ba   Chen, G ^h   Chen, G M ^h   Chen, H F ^v   Chen, H S ^h   Chereau, X ^d   Chiefari, G ^ae   Chien, C Y ^e   Cifarelli, L ^ao   Cindolo, F ^j   Civinini, C ^r   Clare, I ^q   Clare, R ^q   Cohn, H O ^ah   Coignet, G ^d   Colijn, A P ^b   Colino, N ^ab   Commichau, V ^a   Costantini, S ⁱ   Cotorobai, F ⁿ   de la Cruz, B ^ab   Csilling, A ^o   Dai, T S ^q   D'Alessandro, R ^r   de Asmundis, R ^ae   Degre A ^d   Deiters, K ^aw   della Volpe, D ^ae   Denes, P ^al   DeNotaristefani, F ^am   DiBitonto, D ^at   Diemoz, M ^am   van Dierendonck, D ^b   di Lodovico, F ^ay   Dionisi, C ^am   Dittmar, M ^ay   Dominguez, A ^ap   Doria, A ^ae   Dova, M T ^t   Duchesneau, D ^d   Duinker, P ^b   Duran, I ^aq   Dutta, S ^k   Easo, S ^aj   Efremenko, Y ^ah   El Mamouni, H ^aa   Engler, A ^ak   Eppling, F J ^q   Erne F C ^b   Ernenwein, J P ^aa   Extermann, P ^u   Fabre, M ^aw   Faccini, R ^am   Falciano, S ^am   Favara, A ^r   Fay, J ^aa   Fedin, O ^an   Felcini, M ^ay   Fenyi, B ^at   Ferguson, T ^ak   Ferroni, F ^am   Fesefeldt, H ^a   Fiandrini, E ^aj   Field, J H ^u   Filthaut, F ^ak   Fisher, P H ^q   Fisk, I ^ap   Forconi, G ^q   Fredj, L ^u   Freudenreich, K ^ay   Furetta, C ^ac   Galaktionov, Y ^q,ad   Ganguli, S N ^k   Garcia Abia, P ^ax   Gau, S S ^m   Gentile, S ^am   Gheordanescu, N ⁿ   Giagu, S ^am   Goldfarb, S ^x   Goldstein, J ^l   Gong, Z F ^v   Gougas, A ^e   Gratta, G ^ai   Gruenewald, M W ⁱ   Gupta, V K ^al   Gurtu, A ^k   Gutay, L J ^av   Hartmann, B ^a   Hasan, A ^af   Hatzifotiadou, D ^j   Hebbeker, T ⁱ   Herve A ^s   van Hoek, W C ^ag   Hofer, H ^ay   Hong, S J ^as   Hoorani, H ^ak   Hou, S R ^ba   Hu, G ^e   Innocente, V ^s   Jenkes, K ^a   Jin, B N ^h   Jones, L W ^c   de Jong, P ^s   Josa Mutuberria, I ^ab   Kasser, A ^x   Khan, R A ^t   Kamrad, D ^ax   Kamyshkov, Y ^ah   Kapustinsky, J S ^z   Karyotakis, Y ^d   Kaur, M ^t   Kienzle Focacci, M N ^u   Kim, D ^am   Kim, D H ^as   Kim, J K ^as   Kim, S C ^as   Kim, Y G ^as   Kinnison, W W ^z   Kirkby, A ^ai   Kirkby, D ^ai   Kirkby, J ^s   Kiss, D ^o   Kittel, W ^ag   Klimentov, A ^q,ad   Konig A C ^ag   Kopp, A ^ax   Korolko, I ^ad   Koutsenko, V ^q,ad   Kraemer, R W ^ak   Krenz, W ^a   Kunin, A ^q,ad   Ladron de Guevara, P ^ab   Laktineh, I ^aa   Landi, G ^r   Lapoint, C ^q   Lassila Perini, K ^ay   Laurikainen, P ^w   Lebeau, M ^s   Lebedev, A ^q   Lebrun, P ^aa   Lecomte, P ^ay   Lecoq, P ^s   Le Coultre, P ^ay   Le Goff, J M ^s   Leiste, R ^ax   Leonardi, E ^am   Levtchenko, P ^an   Li, C ^v   Lin, C H ^ba   Lin, W T ^ba   Linde, F L ^b,s   Lista, L ^ae   Liu, Z A ^h   Lohmann, W ^ax   Longo, E ^am   Lu, W ^ai   Lu, Y S ^h   Lubelsmeyer K ^a   Luci, C ^am   Luckey, D ^q   Luminari, L ^am   Lustermann, W ^aw   Ma, W G ^v   Maity, M ^k   Majumder, G ^k   Malgeri, L ^am   Malinin, A ^ad   Mana C ^ab   Mangeol, D ^ag   Mangla, S ^k   Marchesini, P ^ay   Marin, A ^l   Martin, J P ^aa   Marzano, F ^am   Massaro, G G G ^b   McNally, D ^s   McNeil, R R ^g   Mele, S ^ae   Merola, L ^ae   Meschini, M ^r   Metzger, W J ^ag   von der Mey, M ^a   Mi, Y ^x   Mihul, A ⁿ   van Mil, A J W ^ag   Mirabelli, G ^am   Mnich, J ^s   Molnar, P ⁱ   Monteleoni, B ^r   Moore, R ^c   Morganti, S ^am   Moulik, T ^k   Mount, R ^ai   Muller S ^a   Muheim, F ^u   Muijs, A J M ^b   Nahn, S ^q   Napolitano, M ^ae   Nessi Tedaldi, F ^ay   Newman, H ^ai   Niessen, T ^a   Nippe, A ^a   Nisati, A ^am   Nowak, H ^ax   Oh, Y D ^as   Opitz, H ^a   Organtini, G ^am   Ostonen, R ^w   Palomares, C ^ab   Pandoulas, D ^a   Paoletti, S ^am   Paolucci, P ^ae   Park, H K ^ak   Park, I H ^as   Pascale, G ^am   Passaleva, G ^r   Patricelli, S ^ae   Paul, T ^m   Pauluzzi, M ^aj   Paus, C ^a   Pauss, F ^ay   Peach, D ^s   Pei, Y J ^a   Pensotti, S ^ac   Perret Gallix, D ^d   Petersen, B ^ag   Petrak, S ⁱ   Pevsner, A ^e   Piccolo, D ^ae   Pieri, M ^r   Pinto, J C ^ak   Piroue P A ^al   Pistolesi, E ^ac   Plyaskin, V ^ad   Pohl, M ^ay   Pojidaev, V ^r,ad   Postema, H ^q   Produit, N ^u   Prokofiev, D ^an   Rahal Callot, G ^ay   Raja, N ^k   Rancoita, P G ^ac   Rattaggi, M ^ac   Raven, G ^ap   Razis, P ^af   Read, K ^ah   Ren, D ^ay   Rescigno, M ^am   Reucroft, S ^m   van Rhee, T ^au   Riemann, S ^ax   Riles, K ^c   Robohm, A ^ay   Rodin, J ^q   Roe, B P ^c   Romero, L ^ab   Rosier Lees, S ^d   Rosselet, P ^x   van Rossum, W ^au   Roth, S ^a   Rubio, J A ^s   Ruschmeier, D ⁱ   Rykaczewski, H ^ay   Salicio, J ^s   Sanchez, E ^ab   Sanders, M P ^ag   Sarakinos, M E ^w   Sarkar, S ^k   Sassowsky, M ^a   Schafer C ^a   Schegelsky, V ^an   Schmidt Kaerst, S ^a   Schmitz, D ^a   Schmitz, P ^a   Scholz, N ^ay   Schopper, H ^az   Schotanus, DJ ^ag   Schwenke, J ^a   Schwering, G ^a   Sciacca, C ^ae   Sciarrino, D ^u   Servoli, L ^aj   Shevchenko, S ^ai   Shivarov, N ^ar   Shoutko, V ^ad   Shukla, J ^z   Shumilov, E ^ad   Shvorob, A ^ai   Siedenburg, T ^a   Son, D ^as   Sopczak, A ^ax   Smith, B ^q   Spillantini, P ^r   Steuer, M ^q   Stickland, D P ^al   Stone, A ^g   Stone, H ^al   Stoyanov, B ^ar   Straessner, A ^a   Strauch, K ^p   Sudhakar, K ^k   Sultanov, G ^t   Sun, L Z ^v   Susinno, G F ^u   Suter, H ^ay   Swain, J D ^t   Tang, X W ^h   Tauscher, L ^f   Taylor, L ^m   Ting, S C C ^q   Ting, S M ^q   Tonutti, M ^a   Tonwar, S C ^k   Toth J ^o   Tully, C ^al   Tuchscherer, H ^at   Tung, K L ^h   Uchida, Y ^q   Ulbricht, J ^ay   Uwer, U ^s   Valente, E ^am   van de Walle, R T ^ag   Vesztergombi, G ^o   Vetlitsky, I ^ad   Viertel, G ^ay   Vivargent, M ^d   Volkert R ^ax   Vogel, H ^ak   Vogt, H ^ax   Vorobiev, I ^ad   Vorobyov, A A ^an   Vorvolakos, A ^af   Wadhwa, M ^f   Wallraff, W ^a   Wang, J C ^q   Wang, X L ^v   Wang, Z M ^v   Weber, A ^a   Wittgenstein, F ^s   Wu, S X ^t   Wynhoff, S ^a   Xu, J ^l   Xu, Z Z ^v   Yang, B Z ^v   Yang, C G ^h   Yao, X Y ^h   Ye, J B ^v   Yeh, S C ^ba   You, J M ^ak   Zalite, A ^an   Zalite, Y ^an   Zemp, P ^ay   Zeng, Y ^a   Zhang, Z ^h   Zhang, Z P ^v   Zhou, B ^l   Zhu, G Y ^h   Zhu, R Y ^ai   Zichichi, A ^j,s,t   Ziegler, F ^ax   more..

^a RWTH AACHEN UNIVERSITY   (Germany)

^b UNIVERSITY OF AMSTERDAM   (Netherlands)

^c UNIVERSITY OF MICHIGAN   (United States)

^d LABORATOIRE DE PHYSIQUE DES PARTICULES   (France)

^e JOHNS HOPKINS UNIVERSITY   (United States)

^f UNIVERSITY OF BASEL   (Switzerland)

^g LOUISIANA STATE UNIVERSITY   (United States)

^h INSTITUTE OF HIGH ENERGY PHYSICS   (China)

ⁱ HUMBOLDT UNIVERSITY   (Germany)

^j INFN SEZIONE DI BOLOGNA   (Italy)

^k TATA INSTITUTE OF FUNDAMENTAL RESEARCH   (India)

^l BOSTON UNIVERSITY   (United States)

^m NORTHEASTERN UNIVERSITY   (United States)

ⁿ INSTITUTE OF ATOMIC PHYSICS   (Romania)

^o WIGNER RESEARCH CENTRE FOR PHYSICS   (Hungary)

^p HARVARD UNIVERSITY   (United States)

^q MASSACHUSETTS INSTITUTE OF TECHNOLOGY   (United States)

^r INFN SEZIONE DI FIRENZE   (Italy)

^s CERN   (Switzerland)

^t WORLD LABORATORY   (Switzerland)

^u UNIVERSITY OF GENEVA   (Switzerland)

^v UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA   (China)

^w HELSINKI INSTITUTE OF PHYSICS   (Finland)

^x UNIVERSITY OF LAUSANNE   (Switzerland)

^y UNIVERSITY OF SALENTO   (Italy)

^z LOS ALAMOS NATIONAL LABORATORY   (United States)

^aa UNIVERSITÉ LYON 1   (France)

^ab CIEMAT   (Spain)

^ac INFN SEZIONE DI MILANO   (Italy)

^ad INSTITUTE FOR THEORETICAL AND EXPERIMENTAL PHYSICS   (Russian Federation)

^ae INFN SEZIONE DI NAPOLI   (Italy)

^af UNIVERSITY OF CYPRUS   (Cyprus)

^ag RADBOUD UNIVERSITY NIJMEGEN   (Netherlands)

^ah OAK RIDGE NATIONAL LABORATORY   (United States)

^ai CALIFORNIA INSTITUTE OF TECHNOLOGY   (United States)

^aj UNIVERSITY OF PERUGIA   (Italy)

^ak CARNEGIE MELLON UNIVERSITY   (United States)

^al PRINCETON UNIVERSITY   (United States)

^am SAPIENZA UNIVERSITY OF ROME   (Italy)

^an PETERSBURG NUCLEAR PHYSICS INSTITUTE   (Russian Federation)

^ao UNIVERSITY OF SALERNO   (Italy)

^ap UNIVERSITY OF CALIFORNIA   (United States)

^aq UNIVERSITY OF SANTIAGO DE COMPOSTELA   (Spain)

^ar BULGARIAN ACADEMY OF SCIENCES   (Bulgaria)

^as Korea Advanced Institute of Science and Technology (KAIST)   (South Korea)

^at UNIVERSITY OF ALABAMA   (United States)

^au UTRECHT UNIVERSITY   (Netherlands)

^av PURDUE UNIVERSITY   (United States)

^aw PAUL SCHERRER INSTITUTE   (Switzerland)

^ax DESY   (Germany)

^ay ETH ZURICH   (Switzerland)

^az UNIVERSITY OF HAMBURG   (Germany)

^ba High Energy Physics Group   (Taiwan)

more..

Author keywords

[No Author keywords available]

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EID: 0039107454     PISSN: 03702693     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0370-2693(97)01074-5     Document Type: Article

References (70)

1. A. Zichichi et al., Preprint INFN/AE-67/3; Lett. Nuovo Cimento 4 (1970) 1156; Nuovo Cimento 17 A (1973) 383; M. Perl et al., Phys. Rev. Lett. 35 (1975) 1489.
2. A. Zichichi et al., Preprint INFN/AE-67/3; Lett. Nuovo Cimento 4 (1970) 1156; Nuovo Cimento 17 A (1973) 383; M. Perl et al., Phys. Rev. Lett. 35 (1975) 1489.
3. A. Zichichi et al., Preprint INFN/AE-67/3; Lett. Nuovo Cimento 4 (1970) 1156; Nuovo Cimento 17 A (1973) 383; M. Perl et al., Phys. Rev. Lett. 35 (1975) 1489.
4. A. Zichichi et al., Preprint INFN/AE-67/3; Lett. Nuovo Cimento 4 (1970) 1156; Nuovo Cimento 17 A (1973) 383; M. Perl et al., Phys. Rev. Lett. 35 (1975) 1489.
5. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
6. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
7. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
8. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
9. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
10. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
11. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
12. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
13. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
14. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
15. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
16. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
17. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
18. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
19. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
20. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
21. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
22. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
23. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
24. J.D. Bjorken, C.H. Llewellyn Smith, Phys. Rev. D 7 (1973) 887; M. Perl, P. Rapidis, Preprint SLAC-PUB-1496 (1974); J.C. Pati, A. Salam, Phys. Rev. D 10 (1974) 275; Phys. Lett. B 58 (1975) 333; R.N. Mohapatra, J.C. Pati, Phys. Rev. D 11 (1975) 366, 2588; R.N. Mohapatra, G. Senjanovic, Phys. Rev. D 12 (1975) 1502; Phys. Rev. Lett. 44 (1980) 912; J. Maalampi, K. Enqvist, Phys. Lett. B 97 (1980) 315; M. Perl, Preprint SLAC-PUB-2752 (1981); R.E. Shrock, Phys. Rev. D 24 (1981) 1275; M. Gronau, C.N. Leung, J.L. Rosner, Phys. Rev. D 29 (1984) 2539; F.J. Gilman, Comm. Nucl. Part. Phys. 16 (1986) 231; J. Bagger et al., Nucl. Phys. B 258 (1985) 565; J. Hewett, T.G. Rizzo, Phys. Rep. 183 (1989) 193; J. Maalampi, M. Roos, Phys. Rep. 186 (1990) 53; C.T. Hill, E.A. Paschos, Phys. Lett. B 241 (1990) 96; W. Buchmüller, C. Greub, Nucl. Phys. B 363 (1991) 345; B 381 (1992) 109; A. Datta, A. Pilaftsis, Phys. Lett. B 278 (1992) 162; A. Djouadi, Z. Phys. C 63 (1994) 317.
25. ALEPH Collaboration, D. Decamp et al., Phys. Lett. B 236 (1990) 511; Phys. Rep. 216 (1992) 253; DELPHI Collaboration, P. Abreu et al., Nucl. Phys. B 367 (1991) 511; Phys. Lett. B 274 (1992) 230; Collaboration, B. Adeva et al., Phys. Lett. B 251 (1990) 321; Collaboration, O. Adriani et al., Phys. Rep. 236 (1993) 1; OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B 240 (1990) 250; B 247 (1990) 448; B 252 (1990) 290; OPAL Collaboration, G. Alexander et al., Z. Phys. C 52 (1991) 200; MARK II Collaboration, G.S. Abrams et al., Phys. Rev. Lett. 63 (1989) 2447; MARK II Collaboration, G.K. Jung et al., Phys. Rev. Lett. 64 (1990) 1091; MARK II Collaboration, P.R. Burchat et al., Phys. Rev. D 41 (1990) 3542; MARK II Collaboration, E. Soderstrom et al., Phys. Rev. Lett. 64 (1990) 2980.
26. ALEPH Collaboration, D. Decamp et al., Phys. Lett. B 236 (1990) 511; Phys. Rep. 216 (1992) 253; DELPHI Collaboration, P. Abreu et al., Nucl. Phys. B 367 (1991) 511; Phys. Lett. B 274 (1992) 230; Collaboration, B. Adeva et al., Phys. Lett. B 251 (1990) 321; Collaboration, O. Adriani et al., Phys. Rep. 236 (1993) 1; OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B 240 (1990) 250; B 247 (1990) 448; B 252 (1990) 290; OPAL Collaboration, G. Alexander et al., Z. Phys. C 52 (1991) 200; MARK II Collaboration, G.S. Abrams et al., Phys. Rev. Lett. 63 (1989) 2447; MARK II Collaboration, G.K. Jung et al., Phys. Rev. Lett. 64 (1990) 1091; MARK II Collaboration, P.R. Burchat et al., Phys. Rev. D 41 (1990) 3542; MARK II Collaboration, E. Soderstrom et al., Phys. Rev. Lett. 64 (1990) 2980.
27. ALEPH Collaboration, D. Decamp et al., Phys. Lett. B 236 (1990) 511; Phys. Rep. 216 (1992) 253; DELPHI Collaboration, P. Abreu et al., Nucl. Phys. B 367 (1991) 511; Phys. Lett. B 274 (1992) 230; Collaboration, B. Adeva et al., Phys. Lett. B 251 (1990) 321; Collaboration, O. Adriani et al., Phys. Rep. 236 (1993) 1; OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B 240 (1990) 250; B 247 (1990) 448; B 252 (1990) 290; OPAL Collaboration, G. Alexander et al., Z. Phys. C 52 (1991) 200; MARK II Collaboration, G.S. Abrams et al., Phys. Rev. Lett. 63 (1989) 2447; MARK II Collaboration, G.K. Jung et al., Phys. Rev. Lett. 64 (1990) 1091; MARK II Collaboration, P.R. Burchat et al., Phys. Rev. D 41 (1990) 3542; MARK II Collaboration, E. Soderstrom et al., Phys. Rev. Lett. 64 (1990) 2980.
28. ALEPH Collaboration, D. Decamp et al., Phys. Lett. B 236 (1990) 511; Phys. Rep. 216 (1992) 253; DELPHI Collaboration, P. Abreu et al., Nucl. Phys. B 367 (1991) 511; Phys. Lett. B 274 (1992) 230; Collaboration, B. Adeva et al., Phys. Lett. B 251 (1990) 321; Collaboration, O. Adriani et al., Phys. Rep. 236 (1993) 1; OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B 240 (1990) 250; B 247 (1990) 448; B 252 (1990) 290; OPAL Collaboration, G. Alexander et al., Z. Phys. C 52 (1991) 200; MARK II Collaboration, G.S. Abrams et al., Phys. Rev. Lett. 63 (1989) 2447; MARK II Collaboration, G.K. Jung et al., Phys. Rev. Lett. 64 (1990) 1091; MARK II Collaboration, P.R. Burchat et al., Phys. Rev. D 41 (1990) 3542; MARK II Collaboration, E. Soderstrom et al., Phys. Rev. Lett. 64 (1990) 2980.
29. ALEPH Collaboration, D. Decamp et al., Phys. Lett. B 236 (1990) 511; Phys. Rep. 216 (1992) 253; DELPHI Collaboration, P. Abreu et al., Nucl. Phys. B 367 (1991) 511; Phys. Lett. B 274 (1992) 230; Collaboration, B. Adeva et al., Phys. Lett. B 251 (1990) 321; Collaboration, O. Adriani et al., Phys. Rep. 236 (1993) 1; OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B 240 (1990) 250; B 247 (1990) 448; B 252 (1990) 290; OPAL Collaboration, G. Alexander et al., Z. Phys. C 52 (1991) 200; MARK II Collaboration, G.S. Abrams et al., Phys. Rev. Lett. 63 (1989) 2447; MARK II Collaboration, G.K. Jung et al., Phys. Rev. Lett. 64 (1990) 1091; MARK II Collaboration, P.R. Burchat et al., Phys. Rev. D 41 (1990) 3542; MARK II Collaboration, E. Soderstrom et al., Phys. Rev. Lett. 64 (1990) 2980.
30. ALEPH Collaboration, D. Decamp et al., Phys. Lett. B 236 (1990) 511; Phys. Rep. 216 (1992) 253; DELPHI Collaboration, P. Abreu et al., Nucl. Phys. B 367 (1991) 511; Phys. Lett. B 274 (1992) 230; Collaboration, B. Adeva et al., Phys. Lett. B 251 (1990) 321; Collaboration, O. Adriani et al., Phys. Rep. 236 (1993) 1; OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B 240 (1990) 250; B 247 (1990) 448; B 252 (1990) 290; OPAL Collaboration, G. Alexander et al., Z. Phys. C 52 (1991) 200; MARK II Collaboration, G.S. Abrams et al., Phys. Rev. Lett. 63 (1989) 2447; MARK II Collaboration, G.K. Jung et al., Phys. Rev. Lett. 64 (1990) 1091; MARK II Collaboration, P.R. Burchat et al., Phys. Rev. D 41 (1990) 3542; MARK II Collaboration, E. Soderstrom et al., Phys. Rev. Lett. 64 (1990) 2980.
31. ALEPH Collaboration, D. Decamp et al., Phys. Lett. B 236 (1990) 511; Phys. Rep. 216 (1992) 253; DELPHI Collaboration, P. Abreu et al., Nucl. Phys. B 367 (1991) 511; Phys. Lett. B 274 (1992) 230; Collaboration, B. Adeva et al., Phys. Lett. B 251 (1990) 321; Collaboration, O. Adriani et al., Phys. Rep. 236 (1993) 1; OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B 240 (1990) 250; B 247 (1990) 448; B 252 (1990) 290; OPAL Collaboration, G. Alexander et al., Z. Phys. C 52 (1991) 200; MARK II Collaboration, G.S. Abrams et al., Phys. Rev. Lett. 63 (1989) 2447; MARK II Collaboration, G.K. Jung et al., Phys. Rev. Lett. 64 (1990) 1091; MARK II Collaboration, P.R. Burchat et al., Phys. Rev. D 41 (1990) 3542; MARK II Collaboration, E. Soderstrom et al., Phys. Rev. Lett. 64 (1990) 2980.
32. ALEPH Collaboration, D. Decamp et al., Phys. Lett. B 236 (1990) 511; Phys. Rep. 216 (1992) 253; DELPHI Collaboration, P. Abreu et al., Nucl. Phys. B 367 (1991) 511; Phys. Lett. B 274 (1992) 230; Collaboration, B. Adeva et al., Phys. Lett. B 251 (1990) 321; Collaboration, O. Adriani et al., Phys. Rep. 236 (1993) 1; OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B 240 (1990) 250; B 247 (1990) 448; B 252 (1990) 290; OPAL Collaboration, G. Alexander et al., Z. Phys. C 52 (1991) 200; MARK II Collaboration, G.S. Abrams et al., Phys. Rev. Lett. 63 (1989) 2447; MARK II Collaboration, G.K. Jung et al., Phys. Rev. Lett. 64 (1990) 1091; MARK II Collaboration, P.R. Burchat et al., Phys. Rev. D 41 (1990) 3542; MARK II Collaboration, E. Soderstrom et al., Phys. Rev. Lett. 64 (1990) 2980.
33. ALEPH Collaboration, D. Decamp et al., Phys. Lett. B 236 (1990) 511; Phys. Rep. 216 (1992) 253; DELPHI Collaboration, P. Abreu et al., Nucl. Phys. B 367 (1991) 511; Phys. Lett. B 274 (1992) 230; Collaboration, B. Adeva et al., Phys. Lett. B 251 (1990) 321; Collaboration, O. Adriani et al., Phys. Rep. 236 (1993) 1; OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B 240 (1990) 250; B 247 (1990) 448; B 252 (1990) 290; OPAL Collaboration, G. Alexander et al., Z. Phys. C 52 (1991) 200; MARK II Collaboration, G.S. Abrams et al., Phys. Rev. Lett. 63 (1989) 2447; MARK II Collaboration, G.K. Jung et al., Phys. Rev. Lett. 64 (1990) 1091; MARK II Collaboration, P.R. Burchat et al., Phys. Rev. D 41 (1990) 3542; MARK II Collaboration, E. Soderstrom et al., Phys. Rev. Lett. 64 (1990) 2980.
34. ALEPH Collaboration, D. Decamp et al., Phys. Lett. B 236 (1990) 511; Phys. Rep. 216 (1992) 253; DELPHI Collaboration, P. Abreu et al., Nucl. Phys. B 367 (1991) 511; Phys. Lett. B 274 (1992) 230; Collaboration, B. Adeva et al., Phys. Lett. B 251 (1990) 321; Collaboration, O. Adriani et al., Phys. Rep. 236 (1993) 1; OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B 240 (1990) 250; B 247 (1990) 448; B 252 (1990) 290; OPAL Collaboration, G. Alexander et al., Z. Phys. C 52 (1991) 200; MARK II Collaboration, G.S. Abrams et al., Phys. Rev. Lett. 63 (1989) 2447; MARK II Collaboration, G.K. Jung et al., Phys. Rev. Lett. 64 (1990) 1091; MARK II Collaboration, P.R. Burchat et al., Phys. Rev. D 41 (1990) 3542; MARK II Collaboration, E. Soderstrom et al., Phys. Rev. Lett. 64 (1990) 2980.
35. ALEPH Collaboration, D. Decamp et al., Phys. Lett. B 236 (1990) 511; Phys. Rep. 216 (1992) 253; DELPHI Collaboration, P. Abreu et al., Nucl. Phys. B 367 (1991) 511; Phys. Lett. B 274 (1992) 230; Collaboration, B. Adeva et al., Phys. Lett. B 251 (1990) 321; Collaboration, O. Adriani et al., Phys. Rep. 236 (1993) 1; OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B 240 (1990) 250; B 247 (1990) 448; B 252 (1990) 290; OPAL Collaboration, G. Alexander et al., Z. Phys. C 52 (1991) 200; MARK II Collaboration, G.S. Abrams et al., Phys. Rev. Lett. 63 (1989) 2447; MARK II Collaboration, G.K. Jung et al., Phys. Rev. Lett. 64 (1990) 1091; MARK II Collaboration, P.R. Burchat et al., Phys. Rev. D 41 (1990) 3542; MARK II Collaboration, E. Soderstrom et al., Phys. Rev. Lett. 64 (1990) 2980.
36. ALEPH Collaboration, D. Decamp et al., Phys. Lett. B 236 (1990) 511; Phys. Rep. 216 (1992) 253; DELPHI Collaboration, P. Abreu et al., Nucl. Phys. B 367 (1991) 511; Phys. Lett. B 274 (1992) 230; Collaboration, B. Adeva et al., Phys. Lett. B 251 (1990) 321; Collaboration, O. Adriani et al., Phys. Rep. 236 (1993) 1; OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B 240 (1990) 250; B 247 (1990) 448; B 252 (1990) 290; OPAL Collaboration, G. Alexander et al., Z. Phys. C 52 (1991) 200; MARK II Collaboration, G.S. Abrams et al., Phys. Rev. Lett. 63 (1989) 2447; MARK II Collaboration, G.K. Jung et al., Phys. Rev. Lett. 64 (1990) 1091; MARK II Collaboration, P.R. Burchat et al., Phys. Rev. D 41 (1990) 3542; MARK II Collaboration, E. Soderstrom et al., Phys. Rev. Lett. 64 (1990) 2980.
37. ALEPH Collaboration, D. Decamp et al., Phys. Lett. B 236 (1990) 511; Phys. Rep. 216 (1992) 253; DELPHI Collaboration, P. Abreu et al., Nucl. Phys. B 367 (1991) 511; Phys. Lett. B 274 (1992) 230; Collaboration, B. Adeva et al., Phys. Lett. B 251 (1990) 321; Collaboration, O. Adriani et al., Phys. Rep. 236 (1993) 1; OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B 240 (1990) 250; B 247 (1990) 448; B 252 (1990) 290; OPAL Collaboration, G. Alexander et al., Z. Phys. C 52 (1991) 200; MARK II Collaboration, G.S. Abrams et al., Phys. Rev. Lett. 63 (1989) 2447; MARK II Collaboration, G.K. Jung et al., Phys. Rev. Lett. 64 (1990) 1091; MARK II Collaboration, P.R. Burchat et al., Phys. Rev. D 41 (1990) 3542; MARK II Collaboration, E. Soderstrom et al., Phys. Rev. Lett. 64 (1990) 2980.
38. ALEPH Collaboration, D. Decamp et al., Phys. Lett. B 236 (1990) 511; Phys. Rep. 216 (1992) 253; DELPHI Collaboration, P. Abreu et al., Nucl. Phys. B 367 (1991) 511; Phys. Lett. B 274 (1992) 230; Collaboration, B. Adeva et al., Phys. Lett. B 251 (1990) 321; Collaboration, O. Adriani et al., Phys. Rep. 236 (1993) 1; OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B 240 (1990) 250; B 247 (1990) 448; B 252 (1990) 290; OPAL Collaboration, G. Alexander et al., Z. Phys. C 52 (1991) 200; MARK II Collaboration, G.S. Abrams et al., Phys. Rev. Lett. 63 (1989) 2447; MARK II Collaboration, G.K. Jung et al., Phys. Rev. Lett. 64 (1990) 1091; MARK II Collaboration, P.R. Burchat et al., Phys. Rev. D 41 (1990) 3542; MARK II Collaboration, E. Soderstrom et al., Phys. Rev. Lett. 64 (1990) 2980.
39. ALEPH Collaboration, D. Buskulic et al., Phys. Lett. B 384 (1996) 439; ALEPH Collaboration, R. Barate et al., Preprint CERN-PPE/97-041 to be published in Phys. Lett. B; DELPHI Collaboration, P. Abreu et al., Phys. Lett. B 396 (1997) 315; Collaboration, M. Acciarri et al., Phys. Lett. B 377 (1996) 304; OPAL Collaboration, G. Alexander et al., Phys. Lett. B 385 (1996) 433; OPAL Collaboration, K. Ackerstaff et al., Phys. Lett. B 393 (1997) 217.
40. ALEPH Collaboration, D. Buskulic et al., Phys. Lett. B 384 (1996) 439; ALEPH Collaboration, R. Barate et al., Preprint CERN-PPE/97-041 to be published in Phys. Lett. B; DELPHI Collaboration, P. Abreu et al., Phys. Lett. B 396 (1997) 315; Collaboration, M. Acciarri et al., Phys. Lett. B 377 (1996) 304; OPAL Collaboration, G. Alexander et al., Phys. Lett. B 385 (1996) 433; OPAL Collaboration, K. Ackerstaff et al., Phys. Lett. B 393 (1997) 217.
41. ALEPH Collaboration, D. Buskulic et al., Phys. Lett. B 384 (1996) 439; ALEPH Collaboration, R. Barate et al., Preprint CERN-PPE/97-041 to be published in Phys. Lett. B; DELPHI Collaboration, P. Abreu et al., Phys. Lett. B 396 (1997) 315; Collaboration, M. Acciarri et al., Phys. Lett. B 377 (1996) 304; OPAL Collaboration, G. Alexander et al., Phys. Lett. B 385 (1996) 433; OPAL Collaboration, K. Ackerstaff et al., Phys. Lett. B 393 (1997) 217.
42. ALEPH Collaboration, D. Buskulic et al., Phys. Lett. B 384 (1996) 439; ALEPH Collaboration, R. Barate et al., Preprint CERN-PPE/97-041 to be published in Phys. Lett. B; DELPHI Collaboration, P. Abreu et al., Phys. Lett. B 396 (1997) 315; Collaboration, M. Acciarri et al., Phys. Lett. B 377 (1996) 304; OPAL Collaboration, G. Alexander et al., Phys. Lett. B 385 (1996) 433; OPAL Collaboration, K. Ackerstaff et al., Phys. Lett. B 393 (1997) 217.
43. ALEPH Collaboration, D. Buskulic et al., Phys. Lett. B 384 (1996) 439; ALEPH Collaboration, R. Barate et al., Preprint CERN-PPE/97-041 to be published in Phys. Lett. B; DELPHI Collaboration, P. Abreu et al., Phys. Lett. B 396 (1997) 315; Collaboration, M. Acciarri et al., Phys. Lett. B 377 (1996) 304; OPAL Collaboration, G. Alexander et al., Phys. Lett. B 385 (1996) 433; OPAL Collaboration, K. Ackerstaff et al., Phys. Lett. B 393 (1997) 217.
44. ALEPH Collaboration, D. Buskulic et al., Phys. Lett. B 384 (1996) 439; ALEPH Collaboration, R. Barate et al., Preprint CERN-PPE/97-041 to be published in Phys. Lett. B; DELPHI Collaboration, P. Abreu et al., Phys. Lett. B 396 (1997) 315; Collaboration, M. Acciarri et al., Phys. Lett. B 377 (1996) 304; OPAL Collaboration, G. Alexander et al., Phys. Lett. B 385 (1996) 433; OPAL Collaboration, K. Ackerstaff et al., Phys. Lett. B 393 (1997) 217.
45. L3 Collaboration, B. Adeva et al., Nucl. Instr. Meth. A 289 (1990) 35; M. Acciari et al., Nucl. Instr. Meth. A 351 (1994) 300; M. Chemarin et al., Nucl. Instr. Meth. A 349 (1994) 345; M. Adam et al., Nucl. Instr. Meth. A 383 (1996) 342; G. Basti et al., Nucl. Instr. Meth. A 374 (1996) 293.
46. L3 Collaboration, B. Adeva et al., Nucl. Instr. Meth. A 289 (1990) 35; M. Acciari et al., Nucl. Instr. Meth. A 351 (1994) 300; M. Chemarin et al., Nucl. Instr. Meth. A 349 (1994) 345; M. Adam et al., Nucl. Instr. Meth. A 383 (1996) 342; G. Basti et al., Nucl. Instr. Meth. A 374 (1996) 293.
47. L3 Collaboration, B. Adeva et al., Nucl. Instr. Meth. A 289 (1990) 35; M. Acciari et al., Nucl. Instr. Meth. A 351 (1994) 300; M. Chemarin et al., Nucl. Instr. Meth. A 349 (1994) 345; M. Adam et al., Nucl. Instr. Meth. A 383 (1996) 342; G. Basti et al., Nucl. Instr. Meth. A 374 (1996) 293.
48. L3 Collaboration, B. Adeva et al., Nucl. Instr. Meth. A 289 (1990) 35; M. Acciari et al., Nucl. Instr. Meth. A 351 (1994) 300; M. Chemarin et al., Nucl. Instr. Meth. A 349 (1994) 345; M. Adam et al., Nucl. Instr. Meth. A 383 (1996) 342; G. Basti et al., Nucl. Instr. Meth. A 374 (1996) 293.
49. L3 Collaboration, B. Adeva et al., Nucl. Instr. Meth. A 289 (1990) 35; M. Acciari et al., Nucl. Instr. Meth. A 351 (1994) 300; M. Chemarin et al., Nucl. Instr. Meth. A 349 (1994) 345; M. Adam et al., Nucl. Instr. Meth. A 383 (1996) 342; G. Basti et al., Nucl. Instr. Meth. A 374 (1996) 293.
50. M. Gronau, C. Leung, J. Rosner, Phys. Rev. D 29 (1984) 2539.
51. S. Jadach, J. Kühn, TIPTOP Monte Carlo, Preprint MPI-PAE/PTh 64/86.
52. PYTHIA Monte Carlo Program, T. Sjöstrand, Comp. Phys. Comm. 82 (1994) 74.
53. S. Jadach, J. Kühn, Z. Was, Comp. Phys. Comm. 64 (1991) 275; S. Jadach, B.F.L. Ward, Z. Was, Comp. Phys. Comm. 66 (1991) 367.
54. S. Jadach, J. Kühn, Z. Was, Comp. Phys. Comm. 64 (1991) 275; S. Jadach, B.F.L. Ward, Z. Was, Comp. Phys. Comm. 66 (1991) 367.
55. Monte Carlo program KORALW 1.02.M. Skrzypek, S. Jadach, W. Placzek, Z. Was, CERN preprint CERN-TH/95-205, to be published in Comp. Phys. Comm.
56. R. Engel, Z. Phys. C 66 (1993) 1657.
57. F.A. Berends, P.H. Daverveldt, R. Kleiss, Nucl. Phys. B 253 (1985) 421; Comp. Phys. Comm. 40 (1986) 271.
58. F.A. Berends, P.H. Daverveldt, R. Kleiss, Nucl. Phys. B 253 (1985) 421; Comp. Phys. Comm. 40 (1986) 271.
59. F.A. Berends, R. Kleiss, R. Pittau, Nucl. Phys. B 424 (1994) 308; Nucl. Phys. B 426 (1994) 344; B (Proc. Suppl.) 37 (1994) 163; Phys. Lett. B 335 (1994) 490; R. Kleiss, R. Pittau, Comp. Phys. Comm. 83 (1994) 141.
60. F.A. Berends, R. Kleiss, R. Pittau, Nucl. Phys. B 424 (1994) 308; Nucl. Phys. B 426 (1994) 344; B (Proc. Suppl.) 37 (1994) 163; Phys. Lett. B 335 (1994) 490; R. Kleiss, R. Pittau, Comp. Phys. Comm. 83 (1994) 141.
61. F.A. Berends, R. Kleiss, R. Pittau, Nucl. Phys. B 424 (1994) 308; Nucl. Phys. B 426 (1994) 344; B (Proc. Suppl.) 37 (1994) 163; Phys. Lett. B 335 (1994) 490; R. Kleiss, R. Pittau, Comp. Phys. Comm. 83 (1994) 141.
62. F.A. Berends, R. Kleiss, R. Pittau, Nucl. Phys. B 424 (1994) 308; Nucl. Phys. B 426 (1994) 344; B (Proc. Suppl.) 37 (1994) 163; Phys. Lett. B 335 (1994) 490; R. Kleiss, R. Pittau, Comp. Phys. Comm. 83 (1994) 141.
63. F.A. Berends, R. Kleiss, R. Pittau, Nucl. Phys. B 424 (1994) 308; Nucl. Phys. B 426 (1994) 344; B (Proc. Suppl.) 37 (1994) 163; Phys. Lett. B 335 (1994) 490; R. Kleiss, R. Pittau, Comp. Phys. Comm. 83 (1994) 141.
64. The L3 detector simulation is based on GEANT Version 3.15, see R. Brun et al., GEANT 3, CERN DD/EE/84-1 (Revised), September 1987; The GHEISHA program (H. Fesefeldt, RWTH Aachen Report PITHA 85/02 (1985)) is used to simulate hadronic interactions.
65. The L3 detector simulation is based on GEANT Version 3.15, see R. Brun et al., GEANT 3, CERN DD/EE/84-1 (Revised), September 1987; The GHEISHA program (H. Fesefeldt, RWTH Aachen Report PITHA 85/02 (1985)) is used to simulate hadronic interactions.
66. Y.L. Dokshitzer, Contribution to the Workshop on Jets at LEP and HERA, Durham (1990); N. Brown, W.J. Stirling, Rutherford Preprint RAL-91-049; S. Catani et al., Phys. Lett. B 269 (1991) 432; S. Bethke et al., Nucl. Phys. B 370 (1992) 310.
67. Y.L. Dokshitzer, Contribution to the Workshop on Jets at LEP and HERA, Durham (1990); N. Brown, W.J. Stirling, Rutherford Preprint RAL-91-049; S. Catani et al., Phys. Lett. B 269 (1991) 432; S. Bethke et al., Nucl. Phys. B 370 (1992) 310.
68. Y.L. Dokshitzer, Contribution to the Workshop on Jets at LEP and HERA, Durham (1990); N. Brown, W.J. Stirling, Rutherford Preprint RAL-91-049; S. Catani et al., Phys. Lett. B 269 (1991) 432; S. Bethke et al., Nucl. Phys. B 370 (1992) 310.
69. Y.L. Dokshitzer, Contribution to the Workshop on Jets at LEP and HERA, Durham (1990); N. Brown, W.J. Stirling, Rutherford Preprint RAL-91-049; S. Catani et al., Phys. Lett. B 269 (1991) 432; S. Bethke et al., Nucl. Phys. B 370 (1992) 310.
70. L3 Collaboration, M. Acciarri et al., Preprint CERN-PPE/97-052 to be published in Phys. Lett. B.