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

Abstract : 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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Submitted on : Friday, November 27, 2009 - 11:02:56 AM
Last modification on : Tuesday, February 19, 2019 - 9:42:02 AM

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A. Kozela, G. Ban, A. Białek, K. Bodek, P. Gorel, et al.. Measurement of the Transverse Polarization of Electrons Emitted in Free Neutron Decay. 5th International Workshop on Particle Physics with Slow Neutrons, May 2008, Grenoble, France. pp.198-202, ⟨10.1016/j.nima.2009.07.094⟩. ⟨in2p3-00436612⟩

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