Measurement of the Tau Polarisation at LEP

Authors
Heister, A Schael, S Barate, R De Bonis, I Decamp, D Ghez, P Goy, C Lees, JP Merle, E Minard, NN Pietrzyk, B Alemany, R Bravo, S Casado, MP Chmeissani, M Crespo, JM Fernandez, E Fernandez-Bosman, M Garrido, L Grauges, E Martinez, M Merino, G Miquel, R Mir, LM Pacheco, A Ruiz, H Colaleo, A Creanza, D de Palma, M Iaselli, G Maggi, G Maggi, M Nuzzo, S Ranieri, A Raso, G Ruggieri, F Selvaggi, G Silvestris, L Tempesta, P Tricomi, A Zito, G Huang, X Lin, J Ouyang, Q Wang, T Xie, Y Xu, R Xue, S Zhang, J Zhang, L Zhao, W Abbaneo, D Azzurri, P Boix, G Buchmuller, O Cattaneo, M Cerutti, F Clerbaux, B Dissertori, G Drevermann, H Forty, RW Frank, M Greening, TC Hansen, JB Harvey, J Janot, P Jost, B Kado, M Mato, P Moutoussi, A Ranjard, F Rolandi, L Schlatter, D Schmitt, M Schneider, O Spagnolo, P Tejessy, W Teubert, F Tournefier, E Ward, J Wright, AE Ajaltouni, Z Badaud, F Falvard, A Gay, P Henrard, P Jousset, J Michel, B Monteil, S Montret, JC Pallin, D Perret, P Podlyski, F Hansen, JD Hansen, JR Hansen, PH Nilsson, BS Waananen, A Daskalakis, G Kyriakis, A Markou, C Simopoulou, E Vayaki, A Blondel, A Bonneaud, G Brient, JC Rouge, A Rumpf, M Swynghedauw, M Verderi, M Videau, H Focardi, E Parrini, G Zachariadou, K Antonelli, A Antonelli, M Bencivenni, G Bologna, G Bossi, F Campana, P Capon, G Chiarella, V Laurelli, P Mannocchi, G Murtas, F Murtas, GP Passalacqua, L Pepe-Altarelli, M Halley, AW Lynch, JG Negus, P O'Shea, V Raine, C Thompson, AS Wasserbaech, S Cavanaugh, R Dhamotharan, S Geweniger, C Hanke, P Hansper, G Hepp, V Kluge, EE Putzer, A Sommer, J Tittel, K Werner, S Wunsch, M Beuselinck, R Binnie, DM Cameron, W Dornan, PJ Girone, M Marinelli, N Sedgbeer, JK Thompson, JC Ghete, VM Girtler, P Kneringer, E Kuhn, D Rudolph, G Bouhova-Thacker, E Bowdery, CK Finch, AJ Foster, F Hughes, G Jones, RWL Pearson, MR Robertson, NA Giehl, I Jakobs, K Kleinknecht, K Quast, G Renk, B Rohne, E Sander, HG Wachsmuth, H Zeitnitz, C Bonissent, A Carr, J Coyle, P Leroy, O Payre, P Rousseau, D Talby, M Aleppo, N Ragusa, F David, A Dietl, H Ganis, G Huttmann, K Lutjens, G Mannert, C Manner, W Moser, HG Settles, R Stenzel, H Wiedenmann, W Wolf, G Boucrot, J Callot, O Chen, S Davier, M Duflot, L Grivaz, JF Heusse, P Jacholkowska, A Lefrancois, J Nikolic, I Veillet, JJ Videau, I Yuan, C Bagliesi, G Boccali, T Calderini, G Ciulli, V Foa, L Giassi, A Ligabue, F Messineo, A Palla, F Sanguinetti, G Sciaba, A Sguazzoni, G Tenchini, R Venturi, A Verdini, PC Blair, GA Cowan, G Green, MG Medcalf, T Strong, JA Teixeira-Dias, P von Wimmersperg-Toeller, JH Clifft, RW Edgecock, TR Norton, PR Tomalin, IR Bloch-Devaux, B Colas, P Emery, S Kozanecki, W Lancon, E Lemaire, MC Locci, E Perez, P Rander, J Renardy, JF Roussarie, A Schuller, JP Schwindling, J Trabelsi, A Vallage, B Konstantinidis, N Litke, AM Taylor, G Booth, CN Cartwright, S Combley, F Lehto, M Thompson, LF Affholderbach, K Bohrer, A Brandt, S Grupen, C Misiejuk, A Ngac, A Prange, G Sieler, U Giannini, G Rothberg, J Armstrong, SR Cranner, K Elmer, P Ferguson, DPS Gao, Y Gonzalez, S Hayes, OJ Hu, H Jin, S Kile, J McNamara, PA Nielsen, J Orejudos, W Pan, YB Saadi, Y Scott, IJ Walsh, J Wu, SL Wu, X Zobering, G
Citation
A. Heister et al., Measurement of the Tau Polarisation at LEP, EUR PHY J C, 20(3), 2001, pp. 401-430
Citations number
40
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL C
ISSN journal
1434-6044 → ACNP
Volume
20
Issue
3
Year of publication
2001
Pages
401 - 430
Database
ISI
SICI code
1434-6044(200105)20:3<401:MOTTPA>2.0.ZU;2-0
Abstract
The polarisation of tau 's produced in Z decay is measured using 160 pb(-1) of data accumulated at LEP by the ALEPH detector between 1990 and 1995. Th e variation of the polarisation with polar angle yields the two parameters A(e) = 0.1504 +/- 0.0068 and A(tau) = 0.1451 +/- 0.0059 which are consisten t with the hypothesis of e-tau universality. Assuming universality, the val ue A(e-tau) = 0.1474 +/- 0.0045 is obtained from which the effective weak m ixing angle sin(2) theta (eff)(W) = 0.23147 +/- 0.00057 is derived.