Measurement of the Axial-Vector Coupling Constant $g_A$ in Neutron Beta Decay

The matrix element \Vud of the CKM matrix can be determined by two independent measurements in neutron decay: the neutron lifetime $τ_n$ and the ratio of coupling constants $λ=g_A/g_V$, which is most precisely determined by measurements of the beta asymmetry angular correlation coefficient~$A$. We present recent progress on the determination of these coupling constants.

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