Using data collected with the ALEPH detector at LEP correlations between the decay products of the tau(+) and tau- produced in the decay of the Z have been measured. The measurements performed in the decays tau --> pi nu and tau --> p nu place limits on deviations from the Standard Model. These are given by the parameter xi with xi = -1 for the Standard Model. The measured values are xi(pi) = -0.95 +/- 0.11 +/- 0.05 and xi(p) = -1.03 +/- 0.11 +/- 0.05. For models which predict xi(pi) = xi(p) = xi - interpreted as the average tau neutrino helicity - the measurement is xi = -0.99 +/- 0.07 +/- 0.04.

Correlation measurements in Z-]tau(+)tau(-) and the tau-neutrino helicity / D. Buskulic, I. Debonis, D. Decamp, P. Ghez, C. Goy, J. Lees, M. Minard, B. Pietrzyk, F. Ariztizabal, P. Comas, J. Crespo, M. Delfino, I. Efthymiopoulos, E. Fernandez, M. Fernandezbosman, V. Gaitan, L. Garrido, T. Mattison, A. Pacheco, C. Padilla, A. Pascual, 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, Y. Chai, H. Hu, D. Huang, X. Huang, J. Lin, T. Wang, Y. Xie, D. Xu, R. Xu, J. Zhang, L. Zhang, W. Zhao, G. Bonvicini, J. Boudreau, D. Casper, H. Drevermann, R. Forty, G. Ganis, C. Gay, M. Girone, R. Hagelberg, J. Harvey, J. Hilgart, R. Jacobsen, B. Jest, J. Knobloch, I. Lehraus, M. Maggi, C. Markou, M. Martinez, P. Mato, H. Meinhard, A. Minten, R. Miquel, H. Moser, F. Palazzi, J. Pater, J. Perlas, P. Perrodo, J. Pusztaszeri, F. Ranjard, L. Rolandi, J. Rothberg, T. Ruan, M. Saich, D. Schlatter, M. Schmelling, F. Sefkow, W. Tejessy, I. Tomalin, R. Veenhof, H. Wachsmuth, S. Wasserbaech, 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, J. Montret, D. Pallin, P. Perret, F. Podlyski, J. Proriol, F. Saadi, T. Fearnley, J. Hansen, J. Hansen, J. Hansen, P. Hansen, R. Mollerud, B. Nilsson, A. Kyriakis, E. Simopoulou, I. Siotis, A. Vayaki, K. Zachariadou, J. Badier, A. Blondel, G. Bonneaud, J. Brient, P. Bourdon, G. Fouque, S. Orteu, A. Rouge, M. Rumpf, R. Tanaka, M. Verderi, H. Videau, D. Candlin, M. Parsons, E. Veitch, E. Focardi, L. Moneta, G. Parrini, M. Corden, C. Georgiopoulos, D. Jaffe, D. Levinthal, A. Antonelli, R. Baldini, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, F. Cerutti, V. Chiarella, G. Felici, P. Laurelli, G. Mannocchi, F. Murtas, G. Murtas, L. Passalacqua, M. Pepealtarelli, P. Colrain, I. Tenhave, J. Lynch, W. Maitland, W. Morton, C. Raine, P. Reeves, J. Scarr, K. Smith, M. Smith, A. Thompson, R. Turnbull, B. Brandl, O. Braun, C. Geweniger, P. Hanke, V. Hepp, E. Kluge, Y. Maumary, A. Putzer, B. Rensch, A. Stahl, K. Tittel, M. Wunsch, R. Beuselinck, D. Binnie, W. Cameron, M. Cattaneo, D. Colling, P. Dornan, J. Hassard, N. Lieske, A. Moutoussi, J. Nash, S. Patton, D. Payne, M. Phillips, G. Sanmartin, J. Sedgbeer, A. Wright, P. Girtler, D. Kuhn, G. Rudolph, R. Vogl, 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. Greene, K. Kleinknecht, J. Raab, B. Renk, H. Sander, H. Schmidt, S. Walther, R. Wanke, B. Wolf, A. Zimmermann, L. Bosisio, R. Dellamarina, G. Giannini, B. Gobbo, L. Pitis, F. Ragusa, L. Bellantoni, W. Chen, J. Conway, Z. Feng, D. Ferguson, Y. Gao, J. Grahl, J. Harton, O. Hayes, J. Nachtman, Y. Pan, Y. Saadi, M. Schmitt, I. Scott, V. Sharma, Z. Shi, J. Turk, A. Walsh, F. Weber, S. Wu, X. Wu, M. Zheng, G. Zobernig. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 321:1/2(1994), pp. 168-176.

Correlation measurements in Z-]tau(+)tau(-) and the tau-neutrino helicity

F. Ragusa;
1994

Abstract

Using data collected with the ALEPH detector at LEP correlations between the decay products of the tau(+) and tau- produced in the decay of the Z have been measured. The measurements performed in the decays tau --> pi nu and tau --> p nu place limits on deviations from the Standard Model. These are given by the parameter xi with xi = -1 for the Standard Model. The measured values are xi(pi) = -0.95 +/- 0.11 +/- 0.05 and xi(p) = -1.03 +/- 0.11 +/- 0.05. For models which predict xi(pi) = xi(p) = xi - interpreted as the average tau neutrino helicity - the measurement is xi = -0.99 +/- 0.07 +/- 0.04.
Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
1994
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/176448
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