Measurements of cross sections and forward-backward asymmetries at the Z resonance and determination of electroweak parameters

Authors
Acciarri, M Achard, P Adriani, O Aguilar-Benitez, M Alcaraz, J Alemanni, G Allaby, J Aloisio, A Alviggi, MG Ambrosi, G Anderhub, H Andreev, VP Angelescu, T Anselmo, F Arefiev, A Azemoon, T Aziz, T Bagnaia, P Baksay, L Balandras, A Ball, RC Banerjee, S Banerjee, S Barczyk, A Barillere, R Barone, L Bartalini, P Basile, M Battiston, R Bay, A Becattini, F Becker, U Behner, F Bellucci, L Berdugo, J Berges, P Bertucci, B Betev, BL Bhattacharya, S Biasini, M Biland, A Blaising, JJ Blyth, SC Bobbink, GJ Bohm, A Boldizsar, L Borgia, B Bourilkov, D Bourquin, M Braccini, S Branson, JG Brigljevic, V Brochu, F Brock, IC Buffini, A Buijs, A Burger, JD Burger, WJ Button, A Cai, XD Campanelli, M Capell, M Romeo, GC Carlino, G Cartacci, AM Casaus, J Castellini, G Cavallari, F Cavallo, N Cecchi, C Cerrada, M Cesaroni, F Chamizo, M Chang, YH Chaturvedi, UK Chemarin, M Chen, A Chen, G Chen, GM Chen, HF Chen, HS Chiefari, G Cifarelli, L Cindolo, F Civinini, C Clare, I Clare, R Coignet, G Colijn, AP Colino, N Costantini, S Cotorobai, F Cozzoni, B de la Cruz, B Csilling, A Cucciarelli, S Dai, TS van Dalen, JA D'Alessandro, R de Asmundis, R Deglon, P Degre, A Deiters, K della Volpe, D Denes, P DeNotaristefani, F De Salvo, A Diemoz, M van Dierendonck, D Di Lodovico, F Dionisi, C Dittmar, M Dominguez, A Doria, A Dova, MT Duchesneau, D Dufournaud, D Duinker, P Duran, I Dutta, S El Mamouni, H Engler, A Eppling, FJ Erne, FC Extermann, P Fabre, M Faccini, R Falagan, MA Falciano, S Favara, A Fay, J Fedin, O Felcini, M Ferguson, T Ferroni, F Fesefeldt, H Fiandrini, E Field, JH Filthaut, F Fisher, PH Fisk, I Forconi, G Fredj, L Freudenreich, K Furetta, C Galaktionov, Y Ganguli, SN Garcia-Abia, P Gataullin, M Gau, SS Gentile, S Gheordanescu, N Giagu, S Gong, ZF Grenier, G Grimm, O Gruenewald, MW Guida, M van Gulik, R Gupta, VK Gurtu, A Gutay, LJ Haas, D Hasan, A Hatzifotiadou, D Hebbeker, T Herve, A Hidas, P Hirschfelder, J Hofer, H Holzner, G Hoorani, H Hou, SR Iashvili, I Innocente, V Jin, BN Jones, LW de Jong, P Josa-Mutuberria, I Khan, RA Kaur, M Kienzle-Focacci, MN Kim, D Kim, JK Kirkby, J Kiss, D Kittel, W Klimentov, A Konig, AC Koffeman, E Kopp, A Koutsenko, V Kraber, M Kraemer, RW Krenz, W Kruger, A Kuijten, H Kunin, A de Guevara, PL Laktineh, I Landi, G Lassila-Perini, K Lebeau, M Lebedev, A Lebrun, P Lecomte, P Lecoq, P Le Coultre, P Lee, HJ Le Goff, JM Leiste, R Leonardi, E Levtchenko, P Li, C Likhoded, S Lin, CH Lin, WT Linde, FL Lista, L Liu, ZA Lohmann, W Longo, E Lu, YS Lu, W Lubelsmeyer, K Luci, C Luckey, D Lugnier, L Luminari, L Lustermann, W Ma, WG Maity, M Malgeri, L Malinin, A Mana, C Mangeol, D Marchesini, P Marian, G Martin, JP Marzano, F Massaro, GGG Mazumdar, K McNeil, RR Mele, S Merola, L Merk, M Meschini, M Metzger, WJ von der Mey, M Mihul, A Milcent, H Mirabelli, G Mnich, J Mohanty, GB Molnar, P Monteleoni, B Moulik, T Muanza, GS Muheim, F Muijs, AJM Musy, M Napolitano, M Nessi-Tedaldi, F Newman, H Niessen, T Nisati, A Nowak, H Organtini, G Oulianov, A Palomares, C Pandoulas, D Paoletti, S Paoloni, A Paolucci, P Paramatti, R Park, HK Park, IH Pascale, G Passaleva, G Patricelli, S Paul, T Pauluzzi, M Paus, C Pauss, F Peach, D Pedace, M Pensotti, S Perret-Gallix, D Petersen, B Piccolo, D Pierella, F Pieri, M Piroue, PA Pistolesi, E Plyaskin, V Pohl, M Pojidaev, V Postema, H Pothier, J Produit, N Prokofiev, DO Prokofiev, D Quartieri, J Rahal-Callot, G Rahaman, MA Raics, P Raja, N Ramelli, R Rancoita, PG Raspereza, A Raven, G Razis, P Ren, D Rescigno, M Reucroft, S van Rhee, T Riemann, S Riles, K Robohm, A Rodin, J Roe, BP Romero, L Rosca, A Rosier-Lees, S Roth, S Rubio, JA Ruschmeier, D Rykaczewski, H Saremi, S Sarkar, S Salicio, J Sanchez, E Sanders, MP Sarakinos, ME Schafer, C Schegelsky, V Schmidt-Kaerst, S Schmitz, D Schopper, H Schotanus, DJ Schwering, G Sciacca, C Sciarrino, D Seganti, A Servoli, L Shevchenko, S Shivarov, N Shoutko, V Shumilov, E Shvorob, A Siedenburg, T Son, D Smith, B Spillantini, P Steuer, M Stickland, DP Stone, A Stone, H Stoyanov, B Straessner, A Sudhakar, K Sultanov, G Sun, LZ Suter, H Swain, JD Szillasi, Z Sztaricskai, T Tang, XW Tauscher, L Taylor, L Tellili, B Timmermans, C Ting, SCC Ting, SM Tonwar, SC Toth, J Tully, C Tung, KL Uchida, Y Ulbricht, J Uwer, U Valente, E Vesztergombi, G Vetlitsky, I Vicinanza, D Viertel, G Villa, S Vivargent, M Vlachos, S Vodopianov, I Vogel, H Vogt, H Vorobiev, I Vorobyov, AA Vorvolakos, A Wadhwa, M Wallraff, W Wang, M Wang, XL Wang, ZM Weber, A Weber, M Wienemann, P Wilkens, H Wu, SX Wynhoff, S Xia, L Xu, ZZ Yang, BZ Yang, CG Yang, HJ Yang, M Ye, JB Yeh, SC You, JM Zalite, A Zalite, Y Zhang, ZP Zhu, GY Zhu, RY Zichichi, A Zilizi, G Zoller, M
Citation
M. Acciarri et al., Measurements of cross sections and forward-backward asymmetries at the Z resonance and determination of electroweak parameters, EUR PHY J C, 16(1), 2000, pp. 1-40
Citations number
117
Language
INGLESE
art.tipo
Review
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL C
ISSN journal
1434-6044 → ACNP
Volume
16
Issue
1
Year of publication
2000
Pages
1 - 40
Database
ISI
SICI code
1434-6044(200008)16:1<1:MOCSAF>2.0.ZU;2-H
Abstract
We report on measurements of hadronic and leptonic cross sections and lepto nic forward backward asymmetries performed with the L3 detector in the year s 1993-95. A total luminosity of 103 pb(-1) nas collected at centre-of-mass energies root s approximate to m(Z) and root s approximate to m(Z) +/- 1.8 GeV which corresponds to 2.5 million hadronic and 245 thousand leptonic ev ents selected. These data lead to a significantly improved determination of Z parameters. From the total cross sections, combined with our measurement s in 1990-92, we obtain the final results: m(Z) = 91 189.8 +/- 3.1 MeV, Gamma(Z) = 2502.4 +/- 4.2 MeV, Gamma(had) = 1751.1 +/- 3.8 MeV, Gamma(l) = 84.14 +/- 0.17 MeV. An invisible width of Gamma(inv) = 499.1 +/- 2.9 MeV is derived which in th e Standard Model yields for the number of light neutrino species N-nu = 2.9 78 +/- 0.014. Adding our results on the leptonic forward-backward asymmetri es and the tau polarisation, the effective vector and axial-vector coupling constants of the neutral weak current to charged leptons are determined to be (g) over bar(V)(l) = -0.0397+/-0.0017 and (g) over bar A(l) = -0.50153/-0.00053. Including our measurements of the Z --> b (b) over bar forward-b ackward and quark charge asymmetries a value for the effective electroweak mixing angle of sin(2)<(theta)over bar>(W) = 0.23093 +/- 0.00066 is derived . All these measurements are in good agreement with the Standard Model of e lectroweak interactions. Using all our measurements of electroweak observab les an upper limit on the mass of the Standard Model Higgs boson of m(H) < 133 GeV is set at 95% confidence level.