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A precise determination of the electroweak mixing angle from semileptonic neutrino scattering |
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| Authors: | J V Allaby U Amaldi G Barbiellini M Baubillier F Bergsma A Capone W Flegel F Grancagnolo L Lanceri M Metcalf C Nieuwenhuis R Pain J Panman R Plunckett K Winter I Abt J Aspiazu A Bungener F W Büsser P D Gall T Hebbeker F Niebergall P Schütt P Stähelin P Gorbunov E Grigoriev V Khovansky A Rosanov A Baroncelli L Barone B Borgia C Bosio M Diemoz C Dionisi U Dore F Ferroni E Longo P F Loverre L Luminari P Monacelli S Morganti F de Notaristefani C Santoni L Tortora V Valente CHARM Collaboration |
| Institution: | 1. CERN, CH-1211, Geneva 23, Switzerland 6. II. Institut für Experimentalphysik, Universit?t Hamburg, D-2000, Hamburg, Federal Republic of Germany 7. Institute for Theoretical and Experimental Physics, SU-117259, Moscow, USSR 8. Istituto Nazionale di Fisica Nucleare, I-00100, Rome, Italy |
| Abstract: | The cross-section ratio of neutral-current and charged-current semileptonic interactions of muon-neutrinos on isoscalar nuclei has been measured with the result:R v =0.3093±0.0031 for hadronic energy larger than 4 GeV. From this ratio we determined the electroweak mixing angle sin2 θ W , wherem c is the charm-quark mass in GeV/c2. Comparison with direct measurements ofm w andm z determines the radiative shift of the intermediate boson mass Δr=0.077±0.025(exp.)±0.038(syst.), in agreement with the prediction. Assuming the validity of the electroweak standard theory we determined ?=0.990?0.013(m c ?1.5)±0.009(exp.)±0.003(theor.). |
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