Measurement of the Proton Asymmetry Parameter C in Neutron Beta Decay

Details Measurement of the Proton Asymmetry Parameter C in Neutron Beta Decay Measurement of the Proton Asymmetry Parameter C in Neutron Beta Decay

2007-12-14

arxiv.org/abs/0712.2442v1

Phys.Rev.Lett.100:151801,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.100.151801

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.

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