A muon-spin-rotation technique has been used to place limits on right-handed currents in μ⁺ decay. The spins of polarized μ⁺ stopped in metal targets were precessed by 70-G or 110-G transverse fields. The muon-spin-rotation signal amplitude produced by high-momentum decay e⁺ emitted near the beam direction implies ξP_μδρ>0.9955 and M(W₂)>370 GeV (90% confidence), where W₂ is a predominantly right-handed gauge boson. The present result combined with our previous spin-held analysis yields ξP_μδρ>0.9966 and M(W₂)>400 GeV.
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Stoker et al. (1985) studied this question.
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