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

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 $G_A/G_V=1.0012G_A^0/G_V^0$.

arXiv comment13 pages, 2 figures

References in corpus (2)

• Is the Unitarity of the quark-mixing-CKM-matrix violated in neutron $\beta$-decay?
• Radiative Corrections to Neutrino-Nucleon Quasielastic Scattering

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