Abstract
The experimental results on $$\bar \nu _\mu $$ -electron scattering, when interpreted withinSU 2×U 1 theories, put severe constraints on the weak charge of the right-handed electron. Under very general assumptions it is shown that the casesI 3 weak (e R − )=0 or − 1/2 are possible. The caseI 3 weak (e R − )=+1/2 is found to be unlikely. All other assignments for e R − are excluded. Consequences for parity violation in atomic physics are discussed.
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