Measurement of the Proton Asymmetry Parameter C in Neutron Beta Decay

Abstract

The proton asymmetry parameter C in neutron decay describes the correlation between neutron spin and proton momentum. In this Letter, the first measurement of this quantity is presented. The result C=-0.2377(26) agrees with the Standard Model expectation. The coefficient C provides an additional parameter for new and improved Standard Model tests. From a differential analysis of the same data (assuming the Standard Model), we obtain lambda=-1.275(16) as ratio of axial-vector and vector coupling constant.

4 pages, 2 figures

References in corpus (3)

• Tests of the standard electroweak model in beta decay
• Measurement of the Neutrino Asymmetry Parameter B in Neutron Decay
• Unrecognized Backscattering in Low Energy Beta Spectroscopy

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