학술논문

Measurement of the tau polarisation at the Z resonance
Document Type
Article
Author
Buskulic, D.Decamp, D.Goy, C.Lees, J. -P.Minard, M. -N.Mours, B.Pietrzyk, B.Alemany, R.Ariztizabal, F.Comas, P.Crespo, J. M.Delfino, M.Fenandez, E.Fernandez-Bosman, M.Gaitan, V.Garrido, Ll.Mattison, T.Pacheco, A.Padilla, C.Pascual, A.Creanza, D.de Palma, M.Farilla, A.Iaselli, G.Maggi, G.Maggi, M.Natali, S.Nuzzo, S.Quattromini, M.Ranieri, A.Raso, G.Romano, F.Ruggieri, F.Selvaggi, G.Silvestris, L.Tempesta, P.Zito, G.Chai, Y.Hu, H.Huang, D.Huang, X.Lin, J.Wang, T.Xie, Y.Xu, D.Xu, R.Zhang, J.Zhao, W.Bauerdick, L. A. T.Blucher, E.Bonvicini, G.Boudreau, J.Casper, D.Drevermann, H.Forty, R. W.Ganis, G.Gay, C.Hagelberg, R.Harvey, J.Haywood, S.Hilgart, J.Jacobsen, R.Jost, B.Knobloch, J.Lehraus, I.Lohse, T.Lusiani, A.Martinez, M.Mato, P.Meinhard, H.Minten, A.Miotto, A.Miquel, R.Moser, H. -G.Palazzi, P.Perlas, J. A.Pusztaszeri, J. -F.Ranjard, F.Redlinger, G.Rolandi, L.Rothberg, J.Ruan, T.Saich, M.Schlatter, D.Schmelling, M.Sefkow, F.Tejessy, W.Wachsmuth, H.Wiedenmann, W.Wildish, T.Witzeling, W.Wotschack, J.Ajaltouni, Z.Badaud, F.Bardadin-Otwinowska, M.El Fellous, R.Falvard, A.Gay, P.Guicheney, C.Henrard, P.Jousset, J.Michel, B.Montret, J. -C.Pallin, D.Perret, P.Podlyski, F.Proriol, J.Prulhière, F.Saadi, F.Fearnley, T.Hansen, J. D.Hansen, J. R.Hansen, P. H.Møllerud, R.Nilsson, B. S.Candlin, D. J.Parsons, M. I.Veitch, E.Moneta, L.Parrini, G.Corden, M.Georgiopoulos, C.Ikeda, M.Lannutti, J.Levinthal, D.Mermikides, M.Sawyer, L.Wasserbaech, S.Antonelli, A.Baldini, R.Bencivenni, G.Bologna, G.Bossi, F.Campana, P.Capon, G.Cerutti, F.Chiarella, V.D'Ettorre-Piazzoli, B.Felici, G.Laurelli, P.Mannocchi, G.Murtas, F.Murtas, G. P.Passalacqua, L.Pepe-Altarelli, M.Picchi, P.Colrain, P.ten Have, I.Lynch, J. G.Maitland, W.Morton, W. T.Raine, C.Reeves, P.Scarr, J. M.Smith, K.Smith, M. G.Thompson, A. S.Turnbull, R. M.Brandl, B.Braun, O.Geweniger, C.Hanke, P.Hepp, V.Kluge, E. E.Maumary, Y.Putzer, A.Rensch, B.Stahl, A.Tittel, K.Wunsch, M.Belk, A. T.Beuselinck, R.Binnie, D. M.Cameron, W.Cattaneo, M.Colling, D. J.Dornan, P. J.Dugeay, S.Greene, A. M.Hassaed, J. F.Lieske, N. M.Nash, J.Payne, D. G.Phillips, M. J.Sedgbeer, J. K.Tomalin, I. R.Wright, A. G.Girtler, P.Kneringer, E.Kuhn, D.Rudolph, G.Bowdery, C. K.Brodbeck, T. J.Finch, A. J.Foster, F.Hughes, G.Jackson, D.Keemer, N. R.Nuttall, M.Patel, A.Sloan, T.Snow, S. W.Whelan, E. P.Efthymiopoulos, I.Kyriakis, A.Simopoulou, E.Vayaki, A.Zachariadou, K.Badier, J.Blondel, A.Bonneaud, G.Brient, J. C.Fouque, G.Orteu, S.Rougé, A.Rumpf, M.Tanaka, R.Verderi, M.Videau, H.Adlung, S.Assmann, R.Bauer, C.Blum, W.Brown, D.Cattaneo, P.Dehning, B.Dietl, H.Dydak, F.Frank, M.Halley, A. W.Lauber, J.Lütjens, G.Lutz, G.Männer, W.Richter, R.Rotscheidt, H.Schröder, J.Schwarz, A. S.Settles, R.Seywerd, H.Stierlin, U.Stiegler, U.Denis, R. St.Wolf, G.Boucrot, J.Callot, O.Cordier, A.Davier, M.Duflot, L.Grivaz, J. -F.Heusse, Ph.Jaffe, D. E.Janot, P.Kim, D. W.Le Diberder, F.Lefrançois, J.Lutz, A. -M.Schune, M. -H.Veillet, J. -J.Videau, I.Zhang, Z.Abbaneo, D.Bagliesi, G.Batignani, G.Bosisio, L.Bottigli, U.Bozzi, C.Calderini, G.Carpinelli, M.Ciocci, M. A.Dell'Orso, R.Ferrante, I.Fidecaro, F.Foa, L.Focardi, E.Forti, F.Giassi, A.Giorgi, M. A.Gregorio, A.Ligabue, F.Mannelli, E. B.Marrocchesi, P. S.Messineo, A.Palla, F.Rizzo, G.Sanguinetti, G.Spagnolo, P.Steinberger, J.Tenchini, R.Tonelli, G.Triggiani, G.Vannini, C.Venturi, A.Verdini, P. G.Walsh, J.Betteridge, A. P.Carter, J. M.Green, M. G.March, P. V.Mir, Ll. M.Medcalf, T.Quazi, I. S.Strong, J. A.West, L. R.Botterill, D. R.Clifft, R. W.Edgecock, T. R.Edwards, M.Fisher, S. M.Jones, T. J.Norton, P. R.Salmon, D. P.Thompson, J. C.Kleinknecht, K.Raab, J.Renk, B.Sander, H. -G.Schmidt, H.Steeg, F.Walther, S. M.Wanke, R.Wolf, B.Aubert, J. -J.Bencheikh, A. M.Benchouk, C.Bonissent, A.Carr, J.Coyle, P.Drinkard, J.Etienne, F.Nicod, D.Papalexiou, S.Payre, P.Roos, L.Rousseau, D.Schwemling, P.Talby, M.Bloch-Devaux, B.Colas, P.Duarte, H.Kozanecki, W.Lançon, E.Lemaire, M. C.Locci, E.Perez, P.Perrier, F.Rander, J.Renardy, J. -F.Rosowsky, A.Roussarie, A.Schuller, J. -P.Schwindling, J.Si Mohand, D.Vallage, B.Johnson, R. P.Litke, A. M.Taylor, G.Wear, J.Ashman, J. G.Babbage, W.Booth, C. N.Buttar, C.Carney, R. E.Cartwright, S.Combley, F.Hatfield, F.Thompson, L. F.Barberio, E.Böhrer, A.Brandt, S.Cowan, G.Grupen, C.Lutters, G.Rivera, F.Schäfer, U.Marina, R. DellaGiannini, G.Gobbo, B.Ragusa, F.Bellantoni, L.Chen, W.Cinabro, D.Conway, J. S.Cowen, D. F.Feng, Z.Ferguson, D. P. S.Gao, Y. S.Grahl, J.Harton, J. L.Jared, R. C.LeClaire, B. W.Lishka, C.Pan, Y. B.Pater, J. R.Saadi, Y.Schmitt, M.Sharma, V.Shi, Z. H.Walsh, A. M.Weber, F. V.Wu, Sau LanWu, X.Zheng, M.Zobernig, G.
Source
Zeitschrift für Physik C Particles and Fields; September 1993, Vol. 59 Issue: 3 p369-386, 18p
Subject
Language
ISSN
01709739; 14315858
Abstract
Using 18.8 pb-1 of data collected in 1990 and 1991, ALEPH has measured the tau polarisation in the decay modes t?ev  $$\bar v$$ , t?µv  $$\bar v$$ , t?p?, t??? and t?a1?, using both the individual tau decay kinematics and the event acollinearity. The measurement of the tau polarisation as a function of the production polar angle yields the two parametersAt andAe, whereAl=2gvlgAl/(gvl)2+(gAl)2] The resultsAt=0.143±0.023 andAe=0.120±0.026 are consistent with the hypothesis of electron-tau universality. Assuming universality yields a measurement of the effective weak mixing angle sin2?weff=0.2332±0.0022.