Michel parameters and τ neutrino helicity from decay correlations in Z-]tau(+)tau(-)

Buskulic, D.; Casper, D.; Debonis, I.; Decamp, D.; Ghez, P.; Goy, C.; Lees, J.; Minard, M.; Odier, P.; Pietrzyk, B.; Ariztizabal, F.; Chmeissani, M.; Crespo, J.; Efthymiopoulos, I.; Fernandez, E.; Fernandezbosman, M.; Gaitan, V.; Garrido, L.; Martinez, M.; Orteu, S.; Pacheco, A.; Padilla, C.; Palla, F.; Pascual, A.; Perlas, J.; Sanchez, F.; Teubert, F.; Creanza, D.; Depalma, M.; Farilla, A.; Iaselli, G.; Maggi, G.; Marinelli, N.; Natali, S.; Nuzzo, S.; Ranieri, A.; Raso, G.; Romano, F.; Ruggieri, F.; Selvaggi, G.; Silvestris, L.; Tempesta, P.; Zito, G.; Huang, X.; Lin, J.; Ouyang, Q.; Wang, T.; Xie, Y.; Xu, R.; Xue, S.; Zhang, J.; Zhang, L.; Zhao, W.; Bonvicini, G.; Cattaneo, M.; Comas, P.; Coyle, P.; Drevermann, H.; Engelhardt, A.; Forty, R.; Frank, M.; Ganis, G.; Girone, M.; Hagelberg, R.; Harvey, J.; Jacobsen, R.; Jost, B.; Knobloch, J.; Lehraus, I.; Maggi, M.; Markou, C.; Martin, E.; Mato, P.; Meinhard, H.; Minten, A.; Miquel, R.; Palazzi, P.; Pater, J.; Perrodo, P.; Pusztaszeri, J.; Ranjard, F.; Rolandi, L.; Schlatter, D.; Schmelling, M.; Tejessy, W.; Tomalin, I.; Veenhof, R.; Venturi, A.; Wachsmuth, H.; Wiedenmann, W.; Wildish, T.; Witzeling, W.; Wotschack, J.; Ajaltouni, Z.; Bardadinotwinowska, M.; Barres, A.; Boyer, C.; Falvard, A.; Gay, P.; Guicheney, C.; Henrard, P.; Jousset, J.; Michel, B.; Monteil, S.; Montret, J.; Pallin, D.; Perret, P.; Podlyski, F.; Proriol, J.; Rossignol, J.; Saadi, F.; Fearnley, T.; Hansen, J.; Hansen, J.; Hansen, J.; Hansen, P.; Johnson, S.; Nilsson, B.; Kyriakis, A.; Simopoulou, E.; Siotis, I.; Vayaki, A.; Zachariadou, K.; Blondel, A.; Bonneaud, G.; Brient, J.; Bourdon, P.; Passalacqua, L.; Rouge, A.; Rumpf, M.; Tanaka, R.; Valassi, A.; Verderi, M.; Videau, H.; Candlin, D.; Parsons, M.; Veitch, E.; Focardi, E.; Parrini, G.; Corden, M.; Delfino, M.; Georgiopoulos, C.; Jaffe, D.; Antonelli, A.; Bencivenni, G.; Bologna, G.; Bossi, F.; Campana, P.; Capon, G.; Cerutti, F.; Chiarella, V.; Felici, G.; Laurelli, P.; Mannocchi, G.; Murtas, F.; Murtas, G.; Pepealtarelli, M.; Salomone, S.; Colrain, P.; Tenhave, I.; Knowles, I.; Lynch, J.; Maitland, W.; Morton, W.; Raine, C.; Reeves, P.; Scarr, J.; Smith, K.; Smith, M.; Thompson, A.; Thorn, S.; Turnbull, R.; Becker, U.; Braun, O.; Geweniger, C.; Graefe, G.; Hanke, P.; Hepp, V.; Kluge, E.; Putzer, A.; Rensch, B.; Schmidt, M.; Sommer, J.; Stenzel, H.; Tittel, K.; Wunsch, M.; Beuselinck, R.; Binnie, D.; Cameron, W.; Colling, D.; Dornan, P.; Konstantinidis, N.; Moneta, L.; Moutoussi, A.; Nash, J.; Sanmartin, G.; Sedgbeer, J.; Stacey, A.; Dissertori, G.; Girtler, P.; Kneringer, E.; Kuhn, D.; Rudolph, G.; Bowdery, C.; Brodbeck, T.; Finch, A.; Foster, F.; Hughes, G.; Jackson, D.; Keemer, N.; Nuttall, M.; Patel, A.; Sloan, T.; Snow, S.; Whelan, E.; Galla, A.; Greene, A.; Kleinknecht, K.; Raab, J.; Renk, B.; Sander, H.; Schmidt, H.; Walther, S.; Wanke, R.; Wolf, B.; Aubert, J.; Bencheikh, A.; Benchouk, C.; Bonissent, A.; Bujosa, G.; Calvet, D.; Carr, J.; Diaconu, C.; Etienne, F.; Thulasidas, M.; Nicod, D.; Payre, P.; Rousseau, D.; Talby, M.; Abt, I.; Assmann, R.; Bauer, C.; Blum, W.; Brown, D.; Dietl, H.; Dydak, F.; Gotzhein, C.; Halley, A.; Jakobs, K.; Kroha, H.; Lutjens, G.; Lutz, G.; Manner, W.; Moser, H.; Richter, R.; Rosadoschlosser, A.; Schwarz, A.; Settles, R.; Seywerd, H.; Stierlin, U.; Stdenis, R.; Wolf, G.; Alemany, R.; Boucrot, J.; Callot, O.; Cordier, A.; Courault, F.; Davier, M.; Duflot, L.; Grivaz, J.; Heusse, P.; Jacquet, M.; Janot, P.; Kim, D.; Lediberder, F.; Lefrancois, J.; Lutz, A.; Musolino, G.; Nikolic, I.; Park, H.; Park, I.; Schune, M.; Simion, S.; Veillet, J.; Videau, I.; Abbaneo, D.; Bagliesi, G.; Batignani, G.; Bettarini, S.; Bottigli, U.; Bozzi, C.; Calderini, G.; Carpinelli, M.; Ciocci, M.; Ciulli, V.; Dellorso, R.; Ferrante, I.; Fidecaro, F.; Foa, L.; Forti, F.; Giassi, A.; Giorgi, M.; Gregorio, A.; Ligabue, F.; Lusiani, A.; Marrocchesi, P.; Messineo, A.; Rizzo, G.; Sanguinetti, G.; Sciaba, A.; Spagnolo, P.; Steinberger, J.; Tenchini, R.; Tonelli, G.; Triggiani, G.; Vannini, C.; Verdini, P.; Walsh, J.; Betteridge, A.; Blair, G.; Bryant, L.; Gao, Y.; Green, M.; Johnson, D.; Medcalf, T.; Mir, L.; Strong, J.; Bertin, V.; Botterill, D.; Clifft, R.; Edgecock, T.; Haywood, S.; Edwards, M.; Maley, P.; Norton, P.; Thompson, J.; Blochdevaux, B.; Colas, P.; Duarte, H.; Emery, S.; Kozanecki, W.; Lancon, E.; Lemaire, M.; Locci, E.; Marx, B.; Perez, P.; Rander, J.; Renardy, J.; Rosowsky, A.; Roussarie, A.; Schuller, J.; Schwindling, J.; Mohand, D.; Trabelsi, A.; Vallage, B.; Johnson, R.; Litke, A.; Taylor, G.; Wear, J.; Beddall, A.; Booth, C.; Boswell, R.; Cartwright, S.; Combley, F.; Dawson, I.; Koksal, A.; Letho, M.; Newton, W.; Rankin, C.; Thompson, L.; Bohrer, A.; Brandt, S.; Cowan, G.; Feigl, E.; Grupen, C.; Lutters, G.; Minguetrodriguez, J.; Rivera, F.; Saraiva, P.; Schafer, U.; Smolik, L.; Bosisio, L.; Dellamarina, R.; Giannini, G.; Gobbo, B.; Pitis, L.; Ragusa, F.; Kim, H.; Rothberg, J.; Wasserbaech, S.; Armstrong, S.; Bellantoni, L.; Elmer, P.; Feng, Z.; Ferguson, D.; Gao, Y.; Gonzalez, S.; Grahl, J.; Harton, J.; Hayes, O.; Hu, H.; Mcnamara, P.; Nachtman, J.; Orejudos, W.; Pan, Y.; Saadi, Y.; Schmitt, M.; Scott, I.; Sharma, V.; Turk, J.; Walsh, A.; Weber, F.; Wu, S.; Wu, X.; Yamartino, J.; Zheng, M.; Zobernig, G.

doi:10.1016/0370-2693(95)00107-V

The Michel parameters and the average tau-neutrino helicity are measured using correlations between the decays of the tau(+) and tau(-) produced on the Z resonance and observed in the ALEPH detector at LEP. The Michel parameters, rho(e), eta(e), xi(e), (delta xi)(e), are determined from tau --> e ($) over bar upsilon(e) upsilon(tau) with e = (e, mu), and the average tau neutrino helicity, (h(upsilon(tau))), from tau --> h tau with h = (pi, rho, a(1)). The results obtained with e-mu universality are: rho(e) = 0.751 +/- 0.039 +/- 0.022, eta(e) = -0.04 +/- 0.15 +/- 0.11, xi(e) = 1.18 +/- 0.15 +/- 0.06, (delta xi)(e) = 0.88 +/- 0.11 +/- 0.07, and the average tau neutrino helicity (h(upsilon(tau))) = -1.006 +/- 0.032 +/- 0.019. No significant deviation from the Standard Model V-A prediction is observed.

Michel parameters and τ neutrino helicity from decay correlations in Z-]tau(+)tau(-) / D. Buskulic, D. Casper, I. Debonis, D. Decamp, P. Ghez, C. Goy, J. Lees, M. Minard, P. Odier, B. Pietrzyk, F. Ariztizabal, M. Chmeissani, J. Crespo, I. Efthymiopoulos, E. Fernandez, M. Fernandezbosman, V. Gaitan, L. Garrido, M. Martinez, S. Orteu, A. Pacheco, C. Padilla, F. Palla, A. Pascual, J. Perlas, F. Sanchez, F. Teubert, D. Creanza, M. Depalma, A. Farilla, G. Iaselli, G. Maggi, N. Marinelli, S. Natali, S. Nuzzo, A. Ranieri, G. Raso, F. Romano, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, G. Bonvicini, M. Cattaneo, P. Comas, P. Coyle, H. Drevermann, A. Engelhardt, R. Forty, M. Frank, G. Ganis, M. Girone, R. Hagelberg, J. Harvey, R. Jacobsen, B. Jost, J. Knobloch, I. Lehraus, M. Maggi, C. Markou, E. Martin, P. Mato, H. Meinhard, A. Minten, R. Miquel, P. Palazzi, J. Pater, P. Perrodo, J. Pusztaszeri, F. Ranjard, L. Rolandi, D. Schlatter, M. Schmelling, W. Tejessy, I. Tomalin, R. Veenhof, A. Venturi, H. Wachsmuth, W. Wiedenmann, T. Wildish, W. Witzeling, J. Wotschack, Z. Ajaltouni, M. Bardadinotwinowska, A. Barres, C. Boyer, A. Falvard, P. Gay, C. Guicheney, P. Henrard, J. Jousset, B. Michel, S. Monteil, J. Montret, D. Pallin, P. Perret, F. Podlyski, J. Proriol, J. Rossignol, F. Saadi, T. Fearnley, J. Hansen, J. Hansen, J. Hansen, P. Hansen, S. Johnson, B. Nilsson, A. Kyriakis, E. Simopoulou, I. Siotis, A. Vayaki, K. Zachariadou, A. Blondel, G. Bonneaud, J. Brient, P. Bourdon, L. Passalacqua, A. Rouge, M. Rumpf, R. Tanaka, A. Valassi, M. Verderi, H. Videau, D. Candlin, M. Parsons, E. Veitch, E. Focardi, G. Parrini, M. Corden, M. Delfino, C. Georgiopoulos, D. Jaffe, A. Antonelli, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, F. Cerutti, V. Chiarella, G. Felici, P. Laurelli, G. Mannocchi, F. Murtas, G. Murtas, M. Pepealtarelli, S. Salomone, P. Colrain, I. Tenhave, I. Knowles, J. Lynch, W. Maitland, W. Morton, C. Raine, P. Reeves, J. Scarr, K. Smith, M. Smith, A. Thompson, S. Thorn, R. Turnbull, U. Becker, O. Braun, C. Geweniger, G. Graefe, P. Hanke, V. Hepp, E. Kluge, A. Putzer, B. Rensch, M. Schmidt, J. Sommer, H. Stenzel, K. Tittel, M. Wunsch, R. Beuselinck, D. Binnie, W. Cameron, D. Colling, P. Dornan, N. Konstantinidis, L. Moneta, A. Moutoussi, J. Nash, G. Sanmartin, J. Sedgbeer, A. Stacey, G. Dissertori, P. Girtler, E. Kneringer, D. Kuhn, G. Rudolph, C. Bowdery, T. Brodbeck, A. Finch, F. Foster, G. Hughes, D. Jackson, N. Keemer, M. Nuttall, A. Patel, T. Sloan, S. Snow, E. Whelan, A. Galla, A. Greene, K. Kleinknecht, J. Raab, B. Renk, H. Sander, H. Schmidt, S. Walther, R. Wanke, B. Wolf, J. Aubert, A. Bencheikh, C. Benchouk, A. Bonissent, G. Bujosa, D. Calvet, J. Carr, C. Diaconu, F. Etienne, M. Thulasidas, D. Nicod, P. Payre, D. Rousseau, M. Talby, I. Abt, R. Assmann, C. Bauer, W. Blum, D. Brown, H. Dietl, F. Dydak, C. Gotzhein, A. Halley, K. Jakobs, H. Kroha, G. Lutjens, G. Lutz, W. Manner, H. Moser, R. Richter, A. Rosadoschlosser, A. Schwarz, R. Settles, H. Seywerd, U. Stierlin, R. Stdenis, G. Wolf, R. Alemany, J. Boucrot, O. Callot, A. Cordier, F. Courault, M. Davier, L. Duflot, J. Grivaz, P. Heusse, M. Jacquet, P. Janot, D. Kim, F. Lediberder, J. Lefrancois, A. Lutz, G. Musolino, I. Nikolic, H. Park, I. Park, M. Schune, S. Simion, J. Veillet, I. Videau, D. Abbaneo, G. Bagliesi, G. Batignani, S. Bettarini, U. Bottigli, C. Bozzi, G. Calderini, M. Carpinelli, M. Ciocci, V. Ciulli, R. Dellorso, I. Ferrante, F. Fidecaro, L. Foa, F. Forti, A. Giassi, M. Giorgi, A. Gregorio, F. Ligabue, A. Lusiani, P. Marrocchesi, A. Messineo, G. Rizzo, G. Sanguinetti, A. Sciaba, P. Spagnolo, J. Steinberger, R. Tenchini, G. Tonelli, G. Triggiani, C. Vannini, P. Verdini, J. Walsh, A. Betteridge, G. Blair, L. Bryant, Y. Gao, M. Green, D. Johnson, T. Medcalf, L. Mir, J. Strong, V. Bertin, D. Botterill, R. Clifft, T. Edgecock, S. Haywood, M. Edwards, P. Maley, P. Norton, J. Thompson, B. Blochdevaux, P. Colas, H. Duarte, S. Emery, W. Kozanecki, E. Lancon, M. Lemaire, E. Locci, B. Marx, P. Perez, J. Rander, J. Renardy, A. Rosowsky, A. Roussarie, J. Schuller, J. Schwindling, D. Mohand, A. Trabelsi, B. Vallage, R. Johnson, A. Litke, G. Taylor, J. Wear, A. Beddall, C. Booth, R. Boswell, S. Cartwright, F. Combley, I. Dawson, A. Koksal, M. Letho, W. Newton, C. Rankin, L. Thompson, A. Bohrer, S. Brandt, G. Cowan, E. Feigl, C. Grupen, G. Lutters, J. Minguetrodriguez, F. Rivera, P. Saraiva, U. Schafer, L. Smolik, L. Bosisio, R. Dellamarina, G. Giannini, B. Gobbo, L. Pitis, F. Ragusa, H. Kim, J. Rothberg, S. Wasserbaech, S. Armstrong, L. Bellantoni, P. Elmer, Z. Feng, D. Ferguson, Y. Gao, S. Gonzalez, J. Grahl, J. Harton, O. Hayes, H. Hu, P. Mcnamara, J. Nachtman, W. Orejudos, Y. Pan, Y. Saadi, M. Schmitt, I. Scott, V. Sharma, J. Turk, A. Walsh, F. Weber, S. Wu, X. Wu, J. Yamartino, M. Zheng, G. Zobernig. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 346:3/4(1995), pp. 379-388.

Michel parameters and τ neutrino helicity from decay correlations in Z-]tau(+)tau(-)

D. Buskulic;D. Casper;I. Debonis;D. Decamp;P. Ghez;C. Goy;J. Lees;M. Minard;P. Odier;B. Pietrzyk;F. Ariztizabal;M. Chmeissani;J. Crespo;I. Efthymiopoulos;E. Fernandez;M. Fernandezbosman;V. Gaitan;L. Garrido;M. Martinez;S. Orteu;A. Pacheco;C. Padilla;F. Palla;A. Pascual;J. Perlas;F. Sanchez;F. Teubert;D. Creanza;M. Depalma;A. Farilla;G. Iaselli;G. Maggi;N. Marinelli;S. Natali;S. Nuzzo;A. Ranieri;G. Raso;F. Romano;F. Ruggieri;G. Selvaggi;L. Silvestris;P. Tempesta;G. Zito;X. Huang;J. Lin;Q. Ouyang;T. Wang;Y. Xie;R. Xu;S. Xue;J. Zhang;L. Zhang;W. Zhao;G. Bonvicini;M. Cattaneo;P. Comas;P. Coyle;H. Drevermann;A. Engelhardt;R. Forty;M. Frank;G. Ganis;M. Girone;R. Hagelberg;J. Harvey;R. Jacobsen;B. Jost;J. Knobloch;I. Lehraus;M. Maggi;C. Markou;E. Martin;P. Mato;H. Meinhard;A. Minten;R. Miquel;P. Palazzi;J. Pater;P. Perrodo;J. Pusztaszeri;F. Ranjard;L. Rolandi;D. Schlatter;M. Schmelling;W. Tejessy;I. Tomalin;R. Veenhof;A. Venturi;H. Wachsmuth;W. Wiedenmann;T. Wildish;W. Witzeling;J. Wotschack;Z. Ajaltouni;M. Bardadinotwinowska;A. Barres;C. Boyer;A. Falvard;P. Gay;C. Guicheney;P. Henrard;J. Jousset;B. Michel;S. Monteil;J. Montret;D. Pallin;P. Perret;F. Podlyski;J. Proriol;J. Rossignol;F. Saadi;T. Fearnley;J. Hansen;J. Hansen;J. Hansen;P. Hansen;S. Johnson;B. Nilsson;A. Kyriakis;E. Simopoulou;I. Siotis;A. Vayaki;K. Zachariadou;A. Blondel;G. Bonneaud;J. Brient;P. Bourdon;L. Passalacqua;A. Rouge;M. Rumpf;R. Tanaka;A. Valassi;M. Verderi;H. Videau;D. Candlin;M. Parsons;E. Veitch;E. Focardi;G. Parrini;M. Corden;M. Delfino;C. Georgiopoulos;D. Jaffe;A. Antonelli;G. Bencivenni;G. Bologna;F. Bossi;P. Campana;G. Capon;F. Cerutti;V. Chiarella;G. Felici;P. Laurelli;G. Mannocchi;F. Murtas;G. Murtas;M. Pepealtarelli;S. Salomone;P. Colrain;I. Tenhave;I. Knowles;J. Lynch;W. Maitland;W. Morton;C. Raine;P. Reeves;J. Scarr;K. Smith;M. Smith;A. Thompson;S. Thorn;R. Turnbull;U. Becker;O. Braun;C. Geweniger;G. Graefe;P. Hanke;V. Hepp;E. Kluge;A. Putzer;B. Rensch;M. Schmidt;J. Sommer;H. Stenzel;K. Tittel;M. Wunsch;R. Beuselinck;D. Binnie;W. Cameron;D. Colling;P. Dornan;N. Konstantinidis;L. Moneta;A. Moutoussi;J. Nash;G. Sanmartin;J. Sedgbeer;A. Stacey;G. Dissertori;P. Girtler;E. Kneringer;D. Kuhn;G. Rudolph;C. Bowdery;T. Brodbeck;A. Finch;F. Foster;G. Hughes;D. Jackson;N. Keemer;M. Nuttall;A. Patel;T. Sloan;S. Snow;E. Whelan;A. Galla;A. Greene;K. Kleinknecht;J. Raab;B. Renk;H. Sander;H. Schmidt;S. Walther;R. Wanke;B. Wolf;J. Aubert;A. Bencheikh;C. Benchouk;A. Bonissent;G. Bujosa;D. Calvet;J. Carr;C. Diaconu;F. Etienne;M. Thulasidas;D. Nicod;P. Payre;D. Rousseau;M. Talby;I. Abt;R. Assmann;C. Bauer;W. Blum;D. Brown;H. Dietl;F. Dydak;C. Gotzhein;A. Halley;K. Jakobs;H. Kroha;G. Lutjens;G. Lutz;W. Manner;H. Moser;R. Richter;A. Rosadoschlosser;A. Schwarz;R. Settles;H. Seywerd;U. Stierlin;R. Stdenis;G. Wolf;R. Alemany;J. Boucrot;O. Callot;A. Cordier;F. Courault;M. Davier;L. Duflot;J. Grivaz;P. Heusse;M. Jacquet;P. Janot;D. Kim;F. Lediberder;J. Lefrancois;A. Lutz;G. Musolino;I. Nikolic;H. Park;I. Park;M. Schune;S. Simion;J. Veillet;I. Videau;D. Abbaneo;G. Bagliesi;G. Batignani;S. Bettarini;U. Bottigli;C. Bozzi;G. Calderini;M. Carpinelli;M. Ciocci;V. Ciulli;R. Dellorso;I. Ferrante;F. Fidecaro;L. Foa;F. Forti;A. Giassi;M. Giorgi;A. Gregorio;F. Ligabue;A. Lusiani;P. Marrocchesi;A. Messineo;G. Rizzo;G. Sanguinetti;A. Sciaba;P. Spagnolo;J. Steinberger;R. Tenchini;G. Tonelli;G. Triggiani;C. Vannini;P. Verdini;J. Walsh;A. Betteridge;G. Blair;L. Bryant;Y. Gao;M. Green;D. Johnson;T. Medcalf;L. Mir;J. Strong;V. Bertin;D. Botterill;R. Clifft;T. Edgecock;S. Haywood;M. Edwards;P. Maley;P. Norton;J. Thompson;B. Blochdevaux;P. Colas;H. Duarte;S. Emery;W. Kozanecki;E. Lancon;M. Lemaire;E. Locci;B. Marx;P. Perez;J. Rander;J. Renardy;A. Rosowsky;A. Roussarie;J. Schuller;J. Schwindling;D. Mohand;A. Trabelsi;B. Vallage;R. Johnson;A. Litke;G. Taylor;J. Wear;A. Beddall;C. Booth;R. Boswell;S. Cartwright;F. Combley;I. Dawson;A. Koksal;M. Letho;W. Newton;C. Rankin;L. Thompson;A. Bohrer;S. Brandt;G. Cowan;E. Feigl;C. Grupen;G. Lutters;J. Minguetrodriguez;F. Rivera;P. Saraiva;U. Schafer;L. Smolik;L. Bosisio;R. Dellamarina;G. Giannini;B. Gobbo;L. Pitis;F. Ragusa;H. Kim;J. Rothberg;S. Wasserbaech;S. Armstrong;L. Bellantoni;P. Elmer;Z. Feng;D. Ferguson;Y. Gao;S. Gonzalez;J. Grahl;J. Harton;O. Hayes;H. Hu;P. Mcnamara;J. Nachtman;W. Orejudos;Y. Pan;Y. Saadi;M. Schmitt;I. Scott;V. Sharma;J. Turk;A. Walsh;F. Weber;S. Wu;X. Wu;J. Yamartino;M. Zheng;G. Zobernig

1995

Abstract

The Michel parameters and the average tau-neutrino helicity are measured using correlations between the decays of the tau(+) and tau(-) produced on the Z resonance and observed in the ALEPH detector at LEP. The Michel parameters, rho(e), eta(e), xi(e), (delta xi)(e), are determined from tau --> e ($) over bar upsilon(e) upsilon(tau) with e = (e, mu), and the average tau neutrino helicity, (h(upsilon(tau))), from tau --> h tau with h = (pi, rho, a(1)). The results obtained with e-mu universality are: rho(e) = 0.751 +/- 0.039 +/- 0.022, eta(e) = -0.04 +/- 0.15 +/- 0.11, xi(e) = 1.18 +/- 0.15 +/- 0.06, (delta xi)(e) = 0.88 +/- 0.11 +/- 0.07, and the average tau neutrino helicity (h(upsilon(tau))) = -1.006 +/- 0.032 +/- 0.019. No significant deviation from the Standard Model V-A prediction is observed.

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	Settori scientifico-disciplinari dell'articolo
	
			Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
		
	Data di pubblicazione
	
			1995
		
	Rivista in ANCE
	
			PHYSICS LETTERS. SECTION B
		
	DOI
	
			https://dx.doi.org/10.1016/0370-2693(95)00107-V
		
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			Article (author)
		
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			01 - Articolo su periodico

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