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Full One-Loop Radiative Corrections to the Asymmetry Parameter of Polarised Neutron Beta Decay

Masataka Fukugita·Takahiro Kubota
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Abstract

We present a calculation of full one-loop radiative corrections, including the constant term, to the asymmetry parameter of polarised neutron beta decay. This gives the radiative correction to the axial coupling constant $g_A$ extracted from the beta asymmetry so that it ties to $g_A$ that appears in neutron decay lifetime in a consistent renormalisation scheme. We find that the ratio of axial-vector to vector couplings determined from the beta asymmetry, after taking account of the outer radiative correction, is related to the bare value as $G_A/G_V=1.0012 G_A^0/G_V^0$.

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Masataka Fukugita, Takahiro Kubota. 2004-05-31. Full One-Loop Radiative Corrections to the Asymmetry Parameter of Polarised Neutron Beta Decay. https://doi.org/10.1016/j.physletb.2004.07.054

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