The properties of the Z resonance are measured from the analysis of 4.5 million Z decays into fermion pairs collected with the ALEPII detector at LEP. The data are consistent with lepton universality. The resonance parameters are measured to be M-Z = (91.1885 +/- 0.0031) GeV/c(2), Gamma(Z) = (2.4941 +/- 0.0043) GeV, sigma(had)(0) = (41.559 +/- 0.058) nb and, combining the three lepton flavours, R-l = 20.725 +/- 0.039. The corresponding number of light neutrino species is N-v = 2.983 +/- 0.013 and the strong coupling constant is alpha(s)(M-Z) = 0.114 +/- 0.004 +/- 0.002(QCD) + 0.005 log(10) [M-H/150 GeV/c(2)]. The lepton pair forward-backward asymmetry is measured to be A(FB)(0,l) = 0.0173 +/- 0.0016 from which the effective weak mixing angle is described: sin(2) theta(eff)(lept) = 0.23089 +/- 0.00089. The measurement of the leptonic width Gamma(ll) = 84.02 +/- 0.15 MeV leads to a determination of the effective rho parameter rho(eff)(lept) = 1.0064 +/- 0.0018. The data support the Standard Model and favour a light Higgs.

Measurement of the Z resonance parameters at LEP

BETTARINI, STEFANO;FERRANTE, ISIDORO;FIDECARO, FRANCESCO;MESSINEO, ALBERTO MARIA;RIZZO, GIULIANA;
2000

Abstract

The properties of the Z resonance are measured from the analysis of 4.5 million Z decays into fermion pairs collected with the ALEPII detector at LEP. The data are consistent with lepton universality. The resonance parameters are measured to be M-Z = (91.1885 +/- 0.0031) GeV/c(2), Gamma(Z) = (2.4941 +/- 0.0043) GeV, sigma(had)(0) = (41.559 +/- 0.058) nb and, combining the three lepton flavours, R-l = 20.725 +/- 0.039. The corresponding number of light neutrino species is N-v = 2.983 +/- 0.013 and the strong coupling constant is alpha(s)(M-Z) = 0.114 +/- 0.004 +/- 0.002(QCD) + 0.005 log(10) [M-H/150 GeV/c(2)]. The lepton pair forward-backward asymmetry is measured to be A(FB)(0,l) = 0.0173 +/- 0.0016 from which the effective weak mixing angle is described: sin(2) theta(eff)(lept) = 0.23089 +/- 0.00089. The measurement of the leptonic width Gamma(ll) = 84.02 +/- 0.15 MeV leads to a determination of the effective rho parameter rho(eff)(lept) = 1.0064 +/- 0.0018. The data support the Standard Model and favour a light Higgs.
Barate, R; Decamp, D; Ghez, P; Goy, C; Lees, Jp; Lucotte, A; Merle, E; Minard, Mn; Pietrzyk, B; Alemany, R; Casado, Mp; Chmeissani, M; Comas, P; Crespo, Jm; Fernandez, E; Fernandez Bosman, M; Garrido, L; Grauges, E; Juste, A; Martinez, M; Merino, G; Miquel, R; Mir, Lm; Orteu, S; Pacheco, A; Park, Ic; Perlas, J; Riu, I; Sanchez, F; 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; Bazarko, A; Becker, U; Boix, G; Bird, F; Blucher, E; Bonvicini, G; Bright Thomas, P; Cattaneo, M; Cerutti, F; Ciulli, V; Dissertori, G; Drevermann, H; Forty, Rw; Frank, M; Greening, Tc; Hagelberg, R; Halley, Aw; Hansen, Jb; Harvey, J; Jacobsen, R; Janot, P; Jost, B; Knobloch, J; Lazeyras, P; Lehraus, I; Maley, P; Mato, P; May, J; Moutoussi, A; Ranjard, F; Rolandi, L; Schlatter, D; Schmitt, M; Schneider, O; Spagnolo, P; Tejessy, W; Teubert, F; Tomalin, Ir; Tournefier, E; Veenhof, R; Wiedenmann, W; Wright, Ae; Ajaltouni, Z; Badaud, F; Chazelle, G; Deschamps, O; Falvard, A; Ferdi, C; Gay, P; Guicheney, C; Henrard, P; Jousset, J; Michel, B; Monteil, S; Montret, Jc; Pallin, D; Perret, P; Podlyski, F; Bertelsen, H; Fernley, T; Hansen, F; Hansen, Jd; Hansen, Jr; Hansen, Ph; Lindahl, A; Mollerud, R; Nilsson, Bs; Rensch, B; Waananen, A; Daskalakis, G; Kyriakis, A; Markou, C; Simopoulou, E; Siotis, I; Vayaki, A; Blondel, A; Bonneaud, G; Brient, Jc; Rouge, A; Rumpf, M; Swynghedauw, M; Tanaka, R; Verderi, M; Videau, H; Focardi, E; Parrini, G; Zachariadou, K; Cavanaugh, R; Corden, M; Georgiopoulos, C; Antonelli, A; Bencivenni, G; Bologna, G; Bossi, F; Campana, P; Capon, G; Chiarella, V; Felici, G; Laurelli, P; Mannocchi, G; Murtas, F; Murtas, Gp; Passalacqua, L; Pepe Altarelli, M; Picchi, P; Colrain, P; ten Have, I; Hughes, Is; Knowles, Ig; Lynch, Jg; Morton, Wt; Raine, C; Reeves, P; O'Shea, V; Scarr, Jm; Smith, K; Thompson, As; Turnbull, Rm; Buchmuller, O; 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; Goodsir, S; Martin, Eb; Marinelli, N; Nash, J; Sciaba, A; Sedgbeer, Jk; Thomson, E; Williams, Md; Ghete, Vm; Girtler, P; Kneringer, E; Kuhn, D; Rudolph, G; Bowdery, Ck; Buck, Pg; Finch, Aj; Foster, F; Hughes, G; Jones, Rwl; Keemer, Nr; Robertson, Na; Sloan, T; Snow, Sw; Williams, Mi; Bauerdick, Lat; van Gemmeren, P; Giehl, I; Jakobs, K; Kasemann, M; Kleinknecht, K; Quast, G; Renk, B; Rohne, E; Sander, Hg; Schmelling, M; Wachsmuth, H; Wanke, R; Zeitnitz, C; Aubert, Jj; Benchouk, C; Bonissent, A; Carr, J; Coyle, P; Etienne, F; Motsch, F; Payre, P; Rousseau, D; Talby, M; Thulasidas, M; Aleppo, M; Antonelli, M; Ragusa, F; Buscher, V; Dietl, H; Ganis, G; Huttmann, K; Lutjens, G; Mannert, C; Manner, W; Moser, Hg; Schael, S; Settles, R; Seywerd, H; Stenzel, H; Wiedenmann, W; Wolf, G; Azzurri, P; Boucrot, J; Callot, O; Chen, S; Cordier, A; Davier, M; Duflot, L; Grivaz, Jf; Heusse, P; Jacholkowska, A; Le Diberder, F; Lefrancois, J; Lutz, Am; Schune, Mh; Veillet, Jj; Videau, I; Zerwas, D; Bagliesi, G; Bettarini, Stefano; Boccali, T; Bozzi, C; Calderini, G; Dell'Orso, R; Fantechi, R; Ferrante, Isidoro; Fidecaro, Francesco; Foa, L; Giassi, A; Gregorio, A; Ligabue, F; Lusiani, A; Marrocchesi, Ps; Messineo, ALBERTO MARIA; Palla, F; Rizzo, Giuliana; Sanguinetti, G; Sguazzoni, G; Steinberger, J; Tenchini, R; Vannini, C; Venturi, A; Verdini, Pg; Blair, Ga; Cowan, G; Green, Mg; Medcalf, T; Strong, Ja; von Wimmersperg Toeller, Jh; Botterill, Dr; Clifft, Rw; Edgecock, Tr; Edwards, M; Haywood, Sj; Norton, Pr; Thompson, Jc; 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; Vallage, B; Black, Sn; Dann, Jh; Kim, Hy; Konstantinidis, N; Litke, Am; Mcneil, Ma; Taylor, G; Booth, Cn; Cartwright, S; Combley, F; Lehto, M; Thompson, Lf; Affholderbach, K; Barberio, E; Bohrer, A; Brandt, S; Burkhardt, H; Feigl, E; Grupen, C; Hess, J; Lutters, G; Meinhard, H; Minguet Rodriguez, J; Mirabito, L; Misiejuk, A; Neugebauer, E; Prange, G; Rivera, F; Saraiva, P; Schafer, U; Seywerd, H; Sieler, U; Smolik, L; Stephan, F; Trier, H; Appollonio, M; Bosisio, L; Della Marina, R; Giannini, G; Gobbo, B; Musolino, G; Pitis, L; Kim, H; Rothberg, J; Wasserbaech, S; Armstrong, Sr; Bellantoni, L; Cinabro, D; Conway, Js; Elmer, P; Feng, Z; Ferguson, Dps; Gao, Y; Gonzalez, S; Grahl, J; Harton, Jl; Hayes, Oj; Hu, H; Jin, S; Johnson, Rp; Kile, J; Mcnamara, Pa; Nielsen, J; Orejudos, W; Pan, Yb; Saadi, Y; Scott, Ij; Sharma, V; Walsh, Am; Walsh, J; Wear, J; Wu, Sl; Wu, X; Yamartino, Jm; Zobernig Gti, A; Zetti, F; Zhang, L; Zhang, S; Zhang, W; Zucchelli,
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