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An improved determination of the electroweak mixing angle from muon-neutrino electron scattering

1991; Elsevier BV; Volume: 259; Issue: 4 Linguagem: Inglês

10.1016/0370-2693(91)91665-i

1873-2445

D. Geiregat, P. Vilain, G. Wilquet, U. Binder, H. Burkard, U. Dore, W. Flegel, H. Grote, T. Mouthuy, H. Øverås, J. Panman, R. Santacesaria, K. Winter, G. Zacek, V. Zacek, R. Beyer, F.W. Büsser, C. Foos, L. Gerland, T. Layda, F. Niebergall, G. Rädel, P. Stähelin, A. Tadsen, T. T. Voss, Th. Delbar, D. Favart, G. Grégoire, E. B. F. G. Knoops, P. Gorbunov, E. Grigoriev, V. Khovansky, A. L. Maslennikov, A. Rozanov, W. Lippich, A. Nathaniel, A. Staude, M. Caria, B. Eckart, A. Ereditato, E. Gorini, F. Grancagnolo, R. Iasevoli, V. Palladino, P. Strolin, A. Capone, D. De Pedis, E. Di Capua, A. Frenkel-Rambaldi, P.F. Loverre, G. Piredda, D. Zanello,

Particle Detector Development and Performance

We are reporting an improved determination of the electroweak mixing angle sin2Θw from the ratio of νμe to νμe scattering cross sections. The CHARM II detector was exposed to neutrino and antineutrino wide band beams at the 450 GeV CERN SPS. Including new data collected in 1989 we have obtained 1316 ± 56 νμe and 1453 ± 62 νμe events. From the ratio of the visible cross sections we determined sin2Θ0=0.239 ± 0.009(stat) ± 0.007(syst) without radiative corrections and gVegAe=0.047 ± 0.046. Combining this last result with recent results on gAe at LEP we obtain gVe= −0.023 ± 0.023.