Measurement of the transverse polarization of electrons emitted in free-neutron decay

Both components of the transverse polarization of electrons (sigmaT1, sigmaT2) emitted in the beta-decay of polarized, free neutrons have been measured. The T-odd, P-odd correlation coefficient quantifying sigmaT2, perpendicular to the neutron polarization and electron momentum, was found to be R=0....

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Bibliographic Details
Published in:	Physical review letters Vol. 102; no. 17; p. 172301
Main Authors:	Kozela, A, Ban, G, Białek, A, Bodek, K, Gorel, P, Kirch, K, Kistryn, St, Kuźniak, M, Naviliat-Cuncic, O, Pulut, J, Severijns, N, Stephan, E, Zejma, J
Format:	Journal Article
Language:	English
Published:	United States American Physical Society 01-05-2009
Subjects:	BETA DECAY ELECTRONS NEUTRONS Nuclear Experiment NUCLEAR PHYSICS AND RADIATION PHYSICS Physics PHYSICS OF ELEMENTARY PARTICLES AND FIELDS POLARIZATION STANDARD MODEL T INVARIANCE WEAK INTERACTIONS
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Summary:	Both components of the transverse polarization of electrons (sigmaT1, sigmaT2) emitted in the beta-decay of polarized, free neutrons have been measured. The T-odd, P-odd correlation coefficient quantifying sigmaT2, perpendicular to the 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 sigmaT1, N=0.056+/-0.011+/-0.005, agrees with the Standard Model expectation, providing an important sensitivity test of the experimental setup.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.102.172301