Z production cross sections and lepton pair forward-backward asymmetries

Buskulic, D; Casper, D; Debonis, I; Decamp, D; Ghez, P; Goy, C; Lees, J; Minard, M; Odier, P; Pietrzyk, B; Ariztizabal, F; Comas, P; Crespo, J; Efthymiopoulos, I; Fernandez, E; Fernandezbosman, M; Gaitan, V; Garrido, L; Martinez, M; Mattison, T; Orteu, S; Pacheco, A; Padilla, C; Pascual, A; Creanza, D; Depalma, M; Farilla, A; Iaselli, G; Maggi, G; Marinelli, N; Natali, S; Nuzzo, S; Ranieri, A; Raso, G; Romano, F; Ruggieri, F; Selvaggi, G; Silvestris, L; Tempesta, P; Zito, G; Chai, Y; Huang, D; Huang, X; Lin, J; Wang, T; Xie, Y; D, X; R, X; Zhang, J; Zhang, L; Zhao, W; Blucher, E; Bonvicini, G; Boudreau, J; Drevermann, H; Forty, R; Ganis, G; Gay, C; Girone, M; Hagelberg, R; Harvey, J; Hilgart, J; Jacobsen, R; Jost, B; Knobloch, J; Lehraus, I; Maggi, M; Markou, C; Mato, P; Meinhard, H; Minten, A; Miquel, R; Moffeit, K; Palazzi, P; Pater, J; Perlas, J; Perrodo, P; Pusztaszeri, J; Ranjard, F; Rolandi, L; Rothberg, J; Ruan, T; Saich, M; Schlatter, D; Schmelling, M; Sefkow, F; Tejessy, W; Tomalin, I; Veenhof, R; Wachsmuth, H; Wasserbaech, S; Wiedenmann, W; Wildish, T; Witzeling, W; Wotschack, J; Ajaltouni, Z; Bardadinotwinowska, M; Barres, A; Boyer, C; Falvard, A; Gay, P; Guicheney, C; Henrard, P; Jousset, J; Michel, B; Montret, J; Pallin, D; Perret, P; Podlyski, F; Proriol, J; Saadi, F; Fearnley, T; Hansen, J; Hansen, J; Hansen, J; Hansen, P; Johnson, S; Mollerud, R; Nilsson, B; Kyriakis, A; Simopoulou, E; Siotis, I; Vayaki, A; Zachariadou, K; Badier, J; Blondel, A; Bonneaud, G; Brient, J; Bourdon, P; Fouque, G; Passalacqua, L; Rouge, A; Rumpf, M; Tanaka, R; Verderi, M; Videau, H; Candlin, D; Parsons, M; Veitch, E; Focardi, E; Moneta, L; Parrini, G; Corden, M; Delfino, M; Georgiopoulos, G; Jaffe, D; Levinthal, D; Antonelli, A; Bencivenni, G; Bologna, G; Bossi, F; Campana, P; Capon, G; Cerutti, F; Chiarella, V; Felici, G; Laurelli, P; Mannocchi, G; Murtas, G; Pepealtarelli, M; Salomone, S; Colrain, P; Tenhave, I; Knowles, I; Lynch, J; Maitland, W; Morton, W; Raine, C; Reeves, P; Scarr, J; Smith, K; Smith, M; Thompson, A; Thorn, S; Turnbull, R; Becker, U; Braun, O; Geweniger, C; Hanke, P; Hepp, V; Kluge, E; Putzer, A; Rensch, B; Schmidt, M; Stenzel, H; Tittel, K; Wunsch, M; Beuselinck, R; Binnie, D; Cameron, W; Cattaneo, M; Colling, D; Dornan, P; Hassard, J; Konstantinidis, N; Moutoussi, A; Nash, J; Payne, D; Sanmartin, G; Sedgbeer, J; Wright, A; Girtler, P; Kuhn, D; Rudolph, G; Vogl, R; Bowdery, C; Brodbeck, T; Finch, A; Foster, F; Hughes, G; Jackson, D; Keemer, N; Nuttall, M; Patel, A; Sloan, T; Snow, S; Whelan, E; Galla, A; Greene, A; Kleinknecht, K; Raab, J; Renk, B; Sander, H; Schmidt, H; Walther, S; Wanke, R; Wolf, B; Bencheikh, A; Benchouk, C; Bonissent, A; Calvet, D; Carr, J; Couyle, P; Diaconu, C; Etienne, F; Nicod, D; Payre, P; Roos, L; Rousseau, D; Schwemling, P; Talby, M; Adlung, S; Assmann, R; Bauer, C; Blum, W; Brown, D; Cattaneo, P; Dehning, B; Dietl, H; Dydak, F; Frank, M; Halley, A; Jakobs, K; Lauber, J; Lutjens, G; Lutz, G; Manner, W; Moser, H; Richter, R; Schroder, J; Schwarz, A; Settles, R; Seywerd, H; Stierlin, U; Stiegler, U; Stdenis, R; Wolf, G; Alemany, R; Boucrot, J; Callot, O; Cordier, A; Davier, M; Duflot, L; Grivaz, J; Heussep,; Janot, P; Kim, D; Lediberder, F; Lefrancois, J; Lutz, A; Musolino, G; Schune, M; Veillet, J; Videau, I; Abbaneo, D; Bagliesi, G; Batignani, G; Bottigli, U; Bozzi, C; Calderini, G; Carpinelli, M; Ciocci, M; Ciulli, V; Dellorso, R; Ferrante, I; Fidecaro, F; Foa, L; Forti, F; Giassi, A; Giorgi, M; Gregorio, A; Ligabue, F; Lusiani, A; Marrocchesi, P; Martin, E; Messineo, A; Palla, F; Rizzo, G; Sanguinetti, G; Spagnolo, P; Steinberger, J; Tenchini, R; Tonelli, G; Triggiani, G; Valassi, A; Vannini, C; Venturi, A; Verdini, P; Walsh, J; Betteridge, A; Gao, Y; Green, M; Johnson, D; March, P; Medcalf, T; Mir, L; Quazi, I; Strong, J; Bertin, V; Botterill, D; Clifft, R; Edgecock, T; Haywood, S; Edwards, M; Norton, P; Thompson, J; Blochdevaux, B; Colas, P; Duarte, H; Emery, S; Kozanecki, W; Lancon, E; Lemaire, M; Locci, E; Marx, B; Perez, P; Rander, J; Renardy, J; Rosowsky, A; Roussarie, A; Schuller, J; Schwindling, J; Mohand, D; Vallage, B; Johnson, R; Litke, A; Taylor, G; Wear, J; Babbage, W; Beddall, E; Booth, C; Cartwright, S; Combley, F; Dawson, I; Rankin, C; Thompson, L; Bohrer, A; Brandt, S; Cowan, G; Feigl, E; Grupen, C; Lutters, G; Minguetrodriguez, J; Rivera, F; Saraiva, P; Schafer, U; Smolik, L; Dellamarina, R; Giannini, G; Gobbo, B; Pitis, L; Ragusa, F; Bellantoni, L; Chen, W; Conway, J; Feng, Z; Dps, F; Gao, Y; Grahl, J; Harton, J; Hayes, O; H, H; Nachtman, J; Pan, Y; Saadi, Y; Schmitt, M; Scott, I; Sharma, V; Turk, J; Walsh, A; Weber, F; Sl, W; X, W; Zheng, M; Yamartino, J; Zobernig, G

doi:10.1007/BF01574159

Precise values of the Z resonance cross sections and lepton pair forward-backward asymmetries are measured from a sample of 1.3 million Z decays into hadrons and charged leptons taken with the ALEPH detector at LEP. A silicon-tungsten luminosity calorimeter was installed in ALEPH in 1992, permitting the determination of the absolute luminosity to a systematic precision of 0.15% (experimental) and 0.25% (theoretical). This is combined with a better understanding of the hadronic event selection and an improved tau pair selection. Including the ALEPH results of the past three years one obtains σh 0 =(41.60±0.16) nb, and Rl=20.69±0.09. The corresponding number of light neutrino species is Nv =2.983±0.034. The lepton pair forward-backward asymmetry is used to derive the ratio of vector to axial-vector couplings of leptons:gV 2(MZ 2)/gA 2(MZ 2)=0.0058 ±0.0011. An application of these results to constrain one model with extra Z bosons is presented.

Buskulic, D., Casper, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., et al. (1994). Z production cross sections and lepton pair forward-backward asymmetries. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 62(4), 539-550 [10.1007/BF01574159].