A new measurement of the ratio of the cross sections of muon-neutrino and muon-antineutrino scattering on electrons |
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Authors: | F Bergsma J Dorenbosch JV Allaby U Amaldi G Barbiellini C Busi W Flegel F Grancagnolo L Lanceri M Metcalf C Nieuwenhuis J Panman R Plunkett C Santoni K Winter I Abt J Aspiazu V Valente |
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Institution: | NIKHEF, Amsterdam, The Netherlands;CERN, Geneva, Switzerland |
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Abstract: | A new experimental determination of the electro-weak mixing angle θW is reported based on a second exposure of the CHARM calorimeter to the CERN-SPS wide-band beam. The ratio R of muon-neutrino- and muon-antineutrino-electron scattering cross section has been determined from a sample of 37 ± 10 and 35 ± 10 events. The experimental result is R = 1.26?0.45+0.72, corresponding to a value of sin2θW = 0.216 ± 0.055. The total sample of events collected in the CHARM calorimeter during the two exposures is events, leadint to the final result sin2θW = 0.215 ± 0.032. The systematic error is estimated to be ± 0.012. |
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Keywords: | CHARM Collaboration |
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