The nucleon axial radius - Archive ouverte HAL
Article Dans Une Revue Physical Review D Année : 2024

The nucleon axial radius

Yi Chen
  • Fonction : Auteur
Yang Li
  • Fonction : Auteur
Qun Wang
  • Fonction : Auteur

Résumé

We present a systematic study of the relativistic axial-vector four-current distributions inside a nucleon. We show in particular that the slope of the axial form factor $G_A(Q^2)$ in the forward limit -- conventionally denoted as $R^2_A$ in the literature -- does not represent the three-dimensional mean-square axial radius in the Breit frame, but corresponds instead to a contribution to the mean-square spin radius. We derive explicit expressions for the latter in different frames and find in general additional contributions that depend on both the nucleon mass and the forward values of the axial-vector form factors $G_A(0)$ and $G_P(0)$.

Dates et versions

hal-04593874 , version 1 (30-05-2024)

Identifiants

Citer

Yi Chen, Yang Li, Cédric Lorcé, Qun Wang. The nucleon axial radius. Physical Review D, 2024, 110 (9), pp.L091503. ⟨10.1103/PhysRevD.110.L091503⟩. ⟨hal-04593874⟩
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