Details

Autor(en) / Beteiligte

• Aguilar-Benitez, M.
• Alviggi, M.G.
• Arefiev, A.
• Bagnaia, P.
• Bakken, J.A.
• Ball, R.C.
• Barone, L.
• Becker, U.
• Bencze, Gy.L.
• Bertucci, B.
• Betev, B.L.
• Böhlen, W.
• Böhringer, T.
• Branson, J.G.
• Cartacci, A.M.
• Chemarin, M.
• Chen, H.S.
• Chiefari, G.
• Contin, A.
• Cui, X.Y.
• Eppling, F.J.
• Fabbretti, R.
• Fabre, M.
• Fay, J.
• Fehlmann, J.
• Fenker, H.
• Ferguson, T.
• Ferroni, F.
• Fesefeldt, H.
• Field, J.
• Freudenreich, K.
• Gailloud, M.
• Gettner, M.
• Glaubman, M.
• Gong, Z.F.
• Goy, C.
• Gurtu, A.
• Güsewell, D.
• Heavey, A.
• Herten, G.
• Herten, U.
• Hofer, H.
• Ilyas, M.M.
• Innocente, V.
• Kaaret, P.
• Khan, R.A.
• Kittel, W.
• Krastev, V.R.
• Krenz, W.
• Kumar, V.
• Kwan, S.
• Lanske, D.
• Leiste, R.
• Levchenko, P.M.
• Li, H.T.
• Li, X.G.
• Liu, Y.
• Lübelsmeyer, K.
• Ludovici, L.
• Lue, X.
• Ma, W.G.
• Magahiz, R.
• Malinin, A.
• Marzano, F.
• Matsuda, T.
• Mirabelli, G.
• Onvlee, J.
• Pei, Y.J.
• Pevsner, A.
• Pieri, M.
• Rosier-Lees, S.
• Salicio, J.
• Schmitz, D.
• Schneegans, M.
• Schotanus, D.J.
• Schreiber, H.J.
• Smirnov, N.
• Sopczak, A.
• Starosta, R.
• Sumner, R.L.
• Thomas, E.
• Tòth, J.
• Vetlitsky, I.
• Vikas, P.
• Vorobyov, An.A.
• Wallraff, W.
• Wang, G.H.
• Wang, X.L.
• Wang, Z.M.
• Weber, J.
• Wenninger, J.
• White, M.
• Wilhelm, R.
• Wittgenstein, F.
• Wright, D.
• Wysłouch, B.
• Xue, Z.L.
• Yang, B.Z.
• Yin, Z.W.
• Zhang, D.

Titel

Measurement of Z 0 decays to hadrons, and a precise determination of the number of neutrino species

Ist Teil von

• Physics letters. B, 1990, Vol.237 (1), p.136-146

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

1990

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• We have made a precise measurement of the cross section for e +e −→Z 0→hadrons with the L3 detector at LEP, covering the s range from 88.28 to 95.04 GeV. From a fit to the Z 0 mass, total width, and the hadronic cross section to be M Z 0=91.160 ± 0.024 (experiment) ±0.030(LEP) GeV, Γ Z 0=2.539±0.054 GeV, and σ h( M Z 0)=29.5±0.7 nb. We also used the fit to the Z 0 peak cross section and the width todetermine Γ invisible=0.548±0.029 GeV, which corresponds to 3.29±0.17 species of light neutrinos. The possibility of four or more neutrino flavors is thus ruled out at the 4σ confidence level.