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Measurement of the Z resonance parameters at LEP

Barate, R. et al. (2000) Measurement of the Z resonance parameters at LEP. European Physical Journal C, 14 (1). 1 -50. ISSN 1434-6044 (doi:10.1007/s100520000319)

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Publisher's URL: http://www.springerlink.com/openurl.asp?genre=article&id=doi:10.1007/s100520000319

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.

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:O'Shea, Prof Valentine and Wright, Dr Amanda and Smith, Prof Kenway and Morton, Dr William
Authors: Barate, R., Decamp, D., Ghez, P., Goy, C., Lees, J.P., Lucotte, A., Merle, E., Minard, M.N., Pietrzyk, B., Alemany, R., Casado, M.P., Chmeissani, M., Comas, P., Crespo, J.M., Fernandez, E., Fernandez-Bosman, M., Garrido, L., Grauges, E., Juste, A., Martinez, M., Merino, G., Miquel, R., Mir, L.M., Orteu, S., Pacheco, A., Park, I.C., 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, R.W., Frank, M., Greening, T.C., Hagelberg, R., Halley, A.W., Hansen, J.B., 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, I.R., Tournefier, E., Veenhof, R., Wiedenmann, W., Wright, A.E., 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, J.C., Pallin, D., Perret, P., Podlyski, F., Bertelsen, H., Fernley, T., Hansen, F., Hansen, J.D., Hansen, J.R., Hansen, P.H., Lindahl, A., Mollerud, R., Nilsson, B.S., Rensch, B., Waananen, A., Daskalakis, G., Kyriakis, A., Markou, C., Simopoulou, E., Siotis, I., Vayaki, A., Blondel, A., Bonneaud, G., Brient, J.C., 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, G.P., Passalacqua, L., Pepe-Altarelli, M., Picchi, P., Colrain, P., ten Have, I.,, Hughes, I.S., Knowles, I.G., Lynch, J.G., Morton, W.T., Raine, C., Reeves, P., O'Shea, V., Scarr, J.M., Smith, K., Thompson, A., Turnbull, R.M., Buchmuller, O., Dhamotharan, S., Geweniger, C., Hanke, P., Hansper, G., Hepp, V., Kluge, E.E., Putzer, A., Sommer, J., Tittel, K., Werner, S., Wunsch, M., Beuselinck, R., Binnie, D.M., Cameron, W., Dornan, P.J., Girone, M., Goodsir, S., Martin, E.B., Marinelli, N., Nash, J., Sciaba, A., Sedgbeer, J.K., Thomson, E., Williams, M.D., Ghete, V.M., Girtler, P., Kneringer, E., Kuhn, D., Rudolph, G., Bowdery, C.K., Buck, P.G., Finch, A.J., Foster, F., Hughes, G., Jones, R.W.L., Keemer, N.R., Sloan, T., Snow, S.W., Williams, M.I., Bauerdick, L.A.T., van Gemmeren, P., Giehl, I., Jakobs, K., Kasemann, M., Kleinknecht, K., Quast, G., Renk, B., Rohne, E., Sander, H.G., Schmelling, M., Wachsmuth, H., Wanke, R., Zeitnitz, C., Aubert, J.J., 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, H.G., Schael, S., Settles, R., Seywerd, H., Stenzel, H., and Wiedenmann, W.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:European Physical Journal C
ISSN:1434-6044

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