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.

arXiv comment4 pages, 4 figures

References in corpus (5)

• Tests of the standard electroweak model in beta decay
• Improved Measurement of Mixing-induced CP Violation in the Neutral B Meson System
• Search for Time-Reversal Violation in the beta-Decay of Polarized 8Li Nuclei
• A new limit of T-violating transverse muon polarization in the $K^{+}\to {\pi }^0{\mu }^{+}\nu$ decay
• Measurement of the B0 Lifetime with Partially Reconstructed B0 --> D*- l+ nu Decays

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