A precise measurement of the tau polarisation at LEP-1

Authors
Abreu, P Adam, W Adye, T Adzic, P Ajinenko, I Albrecht, Z Alderweireld, T Alekseev, GD Alemany, R Allmendinger, T Allport, PP Almehed, S Amaldi, U Amapane, N Amato, S Anassontzis, EG Andersson, P Andreazza, A Andringa, S Antilogus, P Apel, WD Arnoud, Y Asman, B Augustin, JE Augustinus, A Baillon, P Bambade, P Barao, F Barbiellini, G Barbier, R Bardin, DY Barker, G Baroncelli, A Battaglia, M Baubillier, M Becks, KH Begalli, M Behrmann, A Beilliere, P Belokopytov, Y Benekos, NC Benvenuti, AC Berat, C Berggren, M Bertini, D Bertrand, D Besancon, M Bigi, M Bilenky, MS Bizouard, MA Bloch, D Blom, HM Bonesini, M Bonivento, W Boonekamp, M Booth, PSL Borgland, AW Borisov, G Bosio, C Botner, O Boudinov, E Bouquet, B Bourdarios, C Bowcock, TJV Boyko, I Bozovic, I Bozzo, M Bracko, M Branchini, P Brenner, RA Bruckman, P Brunet, JM Bugge, L Buran, T Buschbeck, B Buschmann, P Cabrera, S Caccia, M Calvi, M Camporesi, T Carena, F Carroll, L Caso, C Castillo, MV Cattai, A Cavallo, FR Chabaud, V Charpentier, P Chaussard, L Checchia, P Chelkov, GA Chierici, R Chliapnikov, P Chochula, P Chorowicz, V Chudoba, J Cieslik, K Collins, P Contri, R Cortina, E Cosme, G Cossutti, F Crawley, HB Crennell, D Crepe, S Crosetti, G Maestro, JC Czeller, S Davenport, M Da Silva, W Della Ricca, G Delpierre, P Demaria, N De Angelis, A De Boer, W de Brabandere, S De Clercq, C De Lotto, B De Min, A De Paula, L Dijkstra, H Di Ciaccio, L Dolbeau, J Doroba, K Dracos, M Drees, J Dris, M Duperrin, A Durand, JD Eigen, G Ekelof, T Ekspong, G Ellert, M Elsing, M Engel, JP Santo, ME Fanourakis, G Fassouliotis, D Fayot, J Feindt, M Fenyuk, A Ferrari, P Ferrer, A Ferrer-Ribas, E Ferro, F Fichet, S Firestone, A Flagmeyers, U Foeth, H Fokitis, E Fontanelli, F Franek, B Frodesen, AG Fulda-Quenzer, F Fuster, J Galloni, A Gamba, D Gamblin, S Gandelman, M Garcia, C Gaspar, C Gaspar, M Gasparini, U Gavillet, P Gazis, EN Gele, D Gerdyukov, L Ghodbane, N Gil, I Glege, F Gokieli, R Golob, B Gomez-Ceballos, G Goncalves, P Caballero, IG Gopal, G Gorn, L Gouz, Y Gracco, S Grahl, J Graziani, E Gris, P Grosdidier, G Grzelak, K Guy, J Hahn, F Hahn, S Haider, S Hallgren, A Hamacher, K Hansen, J Harris, FJ Hedberg, V Heising, S Hernandez, JJ Herquet, P Herr, H Hessing, TL Heuser, JM Higon, E Holmgren, SO Holt, PJ Hoorelbeke, S Houlden, M Hrubec, J Huber, M Huet, K Hughes, GJ Hultqvist, K Jackson, JN Jacobsson, R Jalocha, P Janik, R Jarlskog, C Jarlskog, G Jarry, P Jean-Marie, B Jeans, D Johansson, EK Jonsson, P Joram, C Juillot, P Jungermann, L Kapusta, F Karafasoulis, K Katsanevas, S Katsoufis, EC Keranen, R Kernel, G Kersevan, BP Khomenko, BA Khovanski, NN Kiiskinen, A King, B Kinvig, A Kjaer, NJ Kriznic, E Kluit, P Kokkinias, P Kostioukhine, V Kourkoumelis, C Kouznetsov, O Krammer, M Kriznic, E Krstic, J Krumstein, Z Kubinec, P Kurowska, J Kurvinen, K Lamsa, JW Lane, DW Lapin, V Laugier, JP Lauhakangas, R Leder, G Ledroit, F Lefebure, V Leinonen, L Leisos, A Leitner, R Lenzen, G Lepeltier, V Lesiak, T Lethuillier, M Libby, J Liebig, W Liko, D Lipniacka, A Lippi, I Loerstad, B Loken, JG Lopes, JH Lopez, JM Lopez-Fernandez, R Loukas, D Lutz, P Lyons, L MacNaughton, J Mahon, JR Maio, A Malek, A Malmgren, TGM Maltezos, S Malychev, V Mandl, F Marco, J Marco, R Marechal, B Margoni, M Marin, JC Mariotti, C Markou, A Martinez-Rivero, C Martinez-Vidal, F Garcia, SMI Masik, J Mastroyiannopoulos, N Matorras, F Matteuzzi, C Matthiae, G Mazzucato, F Mazzucato, M Mc Cubbin, M Mc Kay, R Mc Nulty, R MC Pherson, G Meroni, C Meyer, WT Miagkov, A Migliore, E Mirabito, L Mitaroff, WA Mjoernmark, U Moa, T Moch, M Moeller, R Moenig, K Monge, MR Moraes, D Moreau, X Morettini, P Morton, G Mueller, U Muenich, K Mulders, M Mulet-Marquis, C Muresan, R Murray, WJ Muryn, B Myatt, G Myklebust, T Naraghi, F Nassiakou, M Navarria, FL Navas, S Nawrocki, K Negri, P Neufeld, N Nicolaidou, R Nielsen, BS Niezurawski, P Nikolenko, M Nomokonov, V Nygren, A Obraztsov, V Olshevski, AG Onofre, A Orava, R Orazi, G Osterberg, K Ouraou, A Paganoni, M Paiano, S Pain, R Paiva, R Palacios, J Palka, H Papadopoulou, TD Papageorgiou, K Pape, L Parkes, LP Perrotta, A Petridou, C Petrolini, A Phillips, HT Pierre, F Pimenta, M Piotto, E Podobnik, T Pol, ME Polok, G Polycarpo, E Poropat, P Pozdniakov, V Privitera, P Pukhaeva, N Pullia, A Radojicic, D Ragazzi, S Rahmani, H Rames, J Ratoff, PN Read, AL Rebecchi, P Redaelli, NG Regler, M Rehn, J Reid, D Reinhardt, R Renton, PB Resvanis, LK Richard, F Ridky, J Rinaudo, G Ripp-Baudot, I Rohne, O Romero, A Ronchese, P Rosenberg, EI Rosinsky, P Roudesu, P Rovelli, T Royon, C Ruhlmann-Kleider, V Ruiz, A Saarikko, H Sacquin, Y Sadovsky, A Sajot, G Salt, J Sampsonidis, D Sannino, M Schwemling, P Schwering, B Schwickerath, U Scuri, F Seager, P Sedykh, Y Segar, AM Seibert, N Sekulin, R Shellard, RC Siebel, M Simard, L Simonetto, F Sisakian, AN Smadja, G Smirnov, N Smirnova, O Smith, GR Sopczak, A Sosnowski, R Spassov, T Spiriti, E Squarcia, S Stanescu, C Stanic, S Stanitzki, M Stevenson, K Stocchi, A Strauss, J Strub, R Stugu, B Szczekowski, M Szeptycka, M Tabarelli, T Taffard, A Tegenfeldt, F Terranova, F Thomas, J Timmermans, J Tinti, N Tkatchev, LG Tobin, M Todorova, S Tomaradze, A Tome, B Tonazzo, A Tortora, L Tortossa, P Transtromer, D Treille, D Tristram, G Trochimczuk, M Troncon, C Turluer, ML Tyapkin, IA Tzamarias, S Ullaland, O Uvarov, V Valenti, G Vallazza, E Van Dam, P Van den Boeck, W Van Doninck, WK Van Eldik, J Van Lysebetten, A van Remortel, N Van Vulpen, I Vegni, G Ventura, L Venus, W Verbeure, F Verlato, M Vertogradov, LS Verzi, V Vilanova, D Vitale, L Vlasov, E Vodopyanov, AS Voulgaris, G Vrba, V Wahlen, H Walck, C Washbrook, AJ Weiser, C Wicke, D Wickens, JH Wilkinson, GR Winter, M Witek, M Wolf, G Yi, J Yushchenko, O Reiserg, C Zalenska, A Zalewski, P Zavrtanik, D Zevgolatakos, E Zimin, NI Zintchenko, A Zoller, P Zucchelli, GC Zumerle, G
Citation
P. Abreu et al., A precise measurement of the tau polarisation at LEP-1, EUR PHY J C, 14(4), 2000, pp. 585-611
Citations number
48
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL C
ISSN journal
1434-6044 → ACNP
Volume
14
Issue
4
Year of publication
2000
Pages
585 - 611
Database
ISI
SICI code
1434-6044(200006)14:4<585:APMOTT>2.0.ZU;2-D
Abstract
The tau polarisation has been studied with the e(+)e(-) --> tau(+)tau(-) da ta collected by the DELPHI detector at LEP in 1993, 1994 and 1995 around th e Z resonance firstly through the exclusive decay channels ev (v) over bar, mu v (v) over bar, pi v, rho v and a(1)v and secondly with an inclusive ha dronic analysis which benefits from a higher efficiency and a better system atic precision. The results have been combined with those previously publis hed on 1990 to 1992 DELPHI data, to produce results which reflect the full LEP-1 statistics. The fit of the tau polarisation dependence on the product ion angle yielded the polarisation parameters A(tau) = 0.1359 +/- 0.0096 an d A(epsilon) = 0.1382 +/- 0.0116. From these results the ratio of the vecto r and axial-vector effective couplings (v) over bar/(a) over bar(tau) = 0.0 683 +/- 0.0048 and (v) over bar/(a) over bar(e) = 0.0694 +/- 0.0058 have be en derived, compatible with e-tau universality. With the assumption of lept on universality, the ratio of vector to axial-vector effective couplings fo r leptons (v) over bar(l)/(a) over bar(l) = 0.0687 +/- 0.0037 was obtained, implying a value of the effective weak mixing angle sin(2) theta(eff)(lept ) = 0.23282 +/- 0.00092.