Year: 2026
Type: preprint
Abstract: We incorporate the $Δ(1232)$ resonance into pion-induced QED radiative corrections to neutron decay and inverse beta decay (IBD). Within the framework of heavy-baryon chiral perturbation theory with explicit $Δ$ degrees of freedom, we compute additional contributions and study their impact on IBD cross sections and on the renormalization of the nucleon isovector vector and axial-vector charges. $Δ$ resonance does not renormalize the vector charge. For the axial-vector charge, including the $Δ$ resonance improves convergence and reduces the QED radiative correction to the experiment-over-lattice-QCD ratio $g_A/\left(g^\mathrm{QCD}_A g_V\right)$. $Δ$ resonance increases the pion-induced QED radiative corrections to IBD by a factor $1.2$-$1.3$.
Source: arXiv (Cornell University)
Authors: Tomalak, Oleksandr, Yang, Yi-Bo
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G6039269878, G8129826652, G8351509261
OpenAlex ID: W7204164107