학술논문

Z production cross sections and lepton pair forward-backward asymmetries
Document Type
Original Paper
Author
Buskulic, D.Casper, D.De Bonis, I.Decamp, D.Chez, P.Goy, C.Lees, J. -P.Minard, M. -N.Odier, P.Pietrzyk, B.Ariztizabal, F.Comas, P.Crespo, J. M.Efthymiopoulos, I.Fernandez, E.Fernandez-Bosman, M.Gaitan, V.Garrido, Ll.Martinez, M.Mattison, T.Orten, S.Pacheco, A.Padilla, C.Pascual, A.Creanza, D.de Palma, 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.Xu, D.Xu, R.Zhang, J.Zhang, L.Zhao, W.Blucher, E.Bonvicini, G.Boudreau, J.Drevermann, H.Forty, R. W.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. R.Perlas, J. A.Perrodo, P.Pusztaszeri, J. -F.Ranjard, F.Rolandi, L.Rothberg, J.Ruan, T.Saich, M.Schlatter, D.Schmelling, M.Sefkow, F.Tejessy, W.Tomalin, I. R.Veenhof, R.Wachsmuth, H.Wasserbaech, S.Wiedenmann, W.Wildish, T.Witzeling, W.Wotschack, J.Ajaltouni, Z.Bardadin-Otwinowska, M.Barres, A.Boyer, C.Falvard, A.Gay, P.Guicheney, C.Henrard, P.Jousset, J.Michel, B.Montret, J. -C.Pallin, D.Perret, P.Podlyski, F.Proriol, J.Saadi, F.Fearnley, T.Hansen, J. B.Hansen, J. D.Hansen, J. R.Hansen, P. H.Johnson, S. D.Møllerud, R.Nilsson, B. S.Kyriakis, A.Simopoulou, E.Siotis, I.Vayaki, A.Zachariadou, K.Badier, J.Blondel, A.Bonneaud, G.Brient, J. C.Bourdon, P.Fouque, G.Passalacqua, L.Rougé, A.Rumpf, M.Tanaka, R.Verderi, M.Videau, H.Candlin, D. J.Parsons, M. I.Veitch, E.Focardi, E.Moneta, L.Parrini, G.Corden, M.Delfino, M.Georgiopoulos, C.Jaffe, D. E.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, F.Murtas, G. P.Pepe-Altarelli, M.Salomone, S.Colrain, P.ten Have, I.Knowles, I. G.Lynch, J. G.Maitland, W.Morton, W. T.Raine, C.Reeves, P.Scarr, J. M.Smith, K.Smith, M. G.Thompson, A. S.Thorn, S.Turnbull, R. M.Becker, U.Braun, O.Geweniger, C.Hanke, P.Hepp, V.Kluge, E. E.Putzer, A.Rensch, B.Schmidt, M.Stenzel, H.Tittel, K.Wunsch, M.Beuselinck, R.Binnie, D. M.Cameron, W.Cattaneo, M.Colling, D. J.Dornan, P. J.Hassard, J. F.Konstantinidis, N.Moutoussi, A.Nash, J.Payne, D. G.San Martin, G.Sedgbeer, J. K.Wright, A. G.Girtler, P.Kuhn, D.Rudolph, G.Vogl, R.Bowdery, C. K.Brodbeck, T. J.Finch, A. J.Foster, F.Hughes, G.Jackson, D.Keemer, N. R.Nuttall, M.Patel, A.Sloan, T.Snow, S. W.Whelan, E. P.Galla, A.Greene, A. M.Kleinknecht, K.Raab, J.Renk, B.Sander, H. -G.Schmidt, H.Walther, S. M.Wanke, R.Wolf, B.Bencheikh, A. M.Benchouk, C.Bonissent, A.Calvet, D.Carr, J.Coyle, 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. W.Jakobs, K.Lauber, J.Lütjens, G.Lutz, G.Männer, W.Moser, H. -G.Richter, R.Schröder, J.Schwarz, A. S.Settles, R.Seywerd, H.Stierlin, U.Stiegler, U.Denis, R. St.Wolf, G.Alemany, R.Boucrot, J.Callot, O.Cordier, A.Davier, M.Duflot, L.Grivaz, J. -F.Heusse, Ph.Janot, P.Kim, D. W.Le Diberder, F.Lefrançois, J.Lutz, A. -M.Musolino, G.Schune, M. -H.Veillet, J. -J.Videau, I.Abbaneo, D.Bagliesi, G.Batignani, G.Bottigli, U.Bozzi, C.Calderini, G.Carpinelli, M.Ciocci, M. A.Ciulli, V.Dell'Orso, R.Ferrante, I.Fidecaro, F.Foa, L.Forti, F.Giassi, A.Giorgi, M. A.Gregorio, A.Ligabue, F.Lusiani, A.Marrocchesi, P. S.Martin, E. B.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. G.Walsh, J.Betteridge, A. P.Green, M. G.Johnson, D. L.March, P. V.Medcalf, T.Mir, Ll. M.Quazi, I. S.Strong, J. A.Bertin, V.Botterill, D. R.Clifft, R. W.Edgecock, T. R.Haywood, S.Edwards, M.Norton, P. R.Thompson, J. C.Bloch-Devaux, B.Colas, P.Duarte, H.Emery, S.Kozanecki, W.Lançon, E.Lemaire, M. C.Locci, E.Marx, B.Perez, P.Rander, J.Renardy, J. -F.Rosowsky, A.Roussarie, A.Schuller, J. -P.Schwindling, J.Si Mohand, D.Vallage, B.Johnson, R. P.Litke, A. M.Taylor, G.Wear, J.Babbage, W.Beddall, E.Booth, C. N.Cartwright, S.Combley, F.Dawson, I.Rankin, C.Thompson, L. F.Böhrer, A.Brandt, S.Cowan, G.Feigl, E.Grupen, C.Lutters, G.Minguet-Rodriguez, J.Rivera, F.Saraiva, P.Schäfer, U.Smolik, L.Bosisio, L.Della Marina, R.Giannini, G.Gobbo, B.Pitis, L.Ragusa, F.Bellantoni, L.Chen, W.Conway, J. S.Feng, Z.Ferguson, D. P. S.Gao, Y. S.Grahl, J.Harton, J. L.Hayes, O. J.Hu, H.Nachtman, J. M.Pan, Y. B.Saadi, Y.Schmitt, M.Scott, I.Sharma, V.Turk, J. D.Walsh, A. M.Weber, F. V.Wu, Sau LanWu, X.Zheng, M.Yamartino, J. M.Zobernig, G.ALEPH Collaboration
Source
Zeitschrift für Physik C Particles and Fields. December 1994 62(4):539-550
Subject
Language
English
ISSN
0170-9739
1431-5858
Abstract
Precise values of theZ resonance cross sections and lepton pair forward-backward asymmetries are measured from a sample of 1.3 millionZ 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 σh0 =(41.60±0.16) nb, andRl=20.69±0.09. The corresponding number of light neutrino species isNv =2.983±0.034. The lepton pair forward-backward asymmetry is used to derive the ratio of vector to axial-vector couplings of leptons:gV2(MZ2)/gA2(MZ2)=0.0058 ±0.0011. An application of these results to constrain one model with extraZ bosons is presented.