Journal
NUCLEAR PHYSICS A
Volume 694, Issue 3-4, Pages 559-589Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0375-9474(01)01083-1
Keywords
standard model; longitudinal polarization; W-R constraints; polarized N-12; positronium time-resolved spectroscopy
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The longitudinal polarization of positrons emitted along and opposite to the nuclear spin direction has been measured in the decay of polarized N-12. The results are consistent with the Standard Model prediction. In manifest left-right symmetric models this measurement provides a lower bound of 310 GeV/c(2) at 90% CL on the mass of a possible right-handed gauge boson contributing to the electroweak interaction. In generalized versions of this model our measurement provides constraints complementary to those set by high-energy experiments. (C) 2001 Elsevier Science B.V. All rights reserved.
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