Abstract
An experimental determination was made of the helicity of muons from pi /sup -/ decays and the cross sections for scattering from lead by Mott scattering. With (2.0 plus or minus 0.3) x 1O/sup 8/ muons incident on the scatterers, a left-right asymmetry of -0.090 plus or minus 0.031 was measured for 1163 plus or minus 60 scattering events. Checks indicated negligible systematic asymmetries. The sign of the asymmetry shows a positive helicity for the negative muon in pion decay in agreement with V-A theory. Agreement of the magnitude of the asymmetry and of the number of events with the ones predicted for the experimental arrangement (0.081 plus or minus O.OO1 and 1210 plus or minus 220, respectively) confirms the results of experiments indicating a purely electromagnetic behavior for muon scattering. The average momentum transfer was 110 Mev/c. Mott scattering of transversely polarized fermions was measured. (auth)
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