M. Allet et al., SEARCH FOR RIGHT-HANDED WEAK CURRENTS IN THE BETA-ASYMMETRY-POLARIZATION CORRELATION FROM N-12 DECAY, Physics letters. Section B, 383(2), 1996, pp. 139-144
The polarization of positions emitted along and opposite to the nuclea
r spin direction has been measured in the decay of polarized N-12. The
results are consistent with the Standard Model prediction. In manifes
t left-right symmetric models this measurement provides a lower limit
of 220 GeV/c(2) at 90% CL on the mass of an eventual right-handed gaug
e boson contributing to the electroweak interaction.