Probing for an IR-fixed Point in QCD by Superallowed Gamow-Teller Transitions in Doubly Magic Nuclei

TL;DR

Recent measurements of superallowed Gamow-Teller transitions in doubly magic nuclei suggest a potential fundamental quenching of the axial coupling constant g_A, which could significantly impact nuclear and particle physics theories beyond the Standard Model.

Contribution

This paper highlights the possibility of a fundamental quenching of g_A based on recent experimental data, distinct from nuclear correlation effects, prompting further investigation.

Findings

Indication of possible fundamental g_A quenching

Potential impact on nuclear effective field theory

Implications for physics beyond the Standard Model

Abstract

This brief note is to point out that the recent measurements at GSI and RIKEN of the superallowed Gamow-Teller transition in the doubly magic closed-shell nucleus $^{100}$Sn could give an indication for a possibly important {\it fundamental} quenching, thus-far unrecognized, of $g_A$, unambiguously distinct from nuclear correlation effects in the framework of nuclear effective field theory. The result, either confirmed or ruled out both experimentally and theory, can have strong impacts on nuclear physics vis-\`a-vis with nuclear effective field theory as well as on particle physics relevant for going beyond the Standard Model.