Measurement of the Transverse Polarization of Electrons Emitted in Free Neutron Decay

Details Measurement of the Transverse Polarization of Electrons Emitted in Free Neutron Decay Measurement of the Transverse Polarization of Electrons Emitted in Free Neutron Decay

2009-02-09

arxiv.org/abs/0902.1415v1

Phys.Rev.Lett.102:172301,2009

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.102.172301

Both components of the transverse polarization of electrons emitted in the beta-decay of polarized, free neutrons have been measured. The T-odd, P-odd correlation coefficient quantifying the component perpendicular to the decay plane defined by neutron polarization and electron momentum, was found to be R=0.008 +/- 0.015 +/-0.005. This value is consistent with time reversal invariance, and significantly improves limits on the relative strength of imaginary scalar couplings in the weak interaction. The value obtained for the correlation coefficient associated with the electron polarization component contained within the decay plane N=0.056 +/- 0.011 +/- 0.005, agrees with the Standard Model expectation, providing an important sensitivity test of the experimental setup.

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