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Electroweak parameters from a high statistics neutrino nucleon scattering experiment

1990; Springer Nature; Volume: 45; Issue: 3 Linguagem: Inglês

10.1007/bf01549665

1431-5858

A. Blondel, P. Böckmann, H. Burkhardt, F. Dydak, A. Grant, R. Hagelberg, E. W. Hughes, W. Krasny, A. Para, H. Taureg, H. Wachsmuth, J. Wotschack, H. Blümer, H. D. Brummel, P. Buchholz, Julia Duda, B. Kampschulte, K. Kleinknecht, J. Knobloch, E. Müller, B. Renk, R. Belusević, Brigitte Falkenburg, R. Geiges, C. Geweniger, V. Hepp, H. Keilwerth, K. Tittel, H. Abramowicz, C. Guyot, J.-P. Merlo, P. Pérez, Frédéric Perrier, J.-P. Schuller, R. Turlay, B. Vallage, J. Królikowski, A. Lipniacka,

High-Energy Particle Collisions Research

The final results from the WA 1/2 neutrino experiment in the 1984 CERN 160 GeV narrow band beam are presented. The ratiosR ν and $$R_{\bar v} $$ of neutral to charged current interaction rates of neutrinos and antineutrinos in iron are measured to beR ν=0.3072±0.0033 and $$R_{\bar v} $$ =0.382±0.016. A value of the electroweak parameter sin2 θ w = 1 −m 2 /m 2 is extracted fromR ν. The result is sin2 θ w =0.228+0.013(m c −1.5)±0.0003 (theor.) wherem c is the mass of the charmed quark in GeV form t =60 GeV,M H =100 GeV, ρ=1. CombiningR ν and $$R_{\bar v} $$ one obtains a value for ρ=0.991+0.023(m c −1.5)±0.020(exp.). Alternatively,R ν and $$R_{\bar v} $$ yield a precise value of the ratio of intermediate vector boson massesm W /m Z =0.880−0.007(m c −1.5)±0.002(exp.)±0.002(theor.). Comparison of these results with those from direct measurements of the vector boson masses are presented. In a model-independent analysis the left- and right-handed neutral current coupling constants,g 2 andg 2 , are determined.