Preprint
Probing the nucleon axial form factor via the e⃗ ++2H→ν¯e+p+p reaction below the pion-production threshold
arXiv, Vol.arXiv
09/18/2026
DOI: 10.48550/arxiv.2609.22435
Abstract
The nucleon axial form factor FA(Q2) is a primary source of systematic uncertainty in charged-current quasielastic interactions, of critical importance for long-baseline neutrino-oscillation studies. Its low-Q2 behavior is particularly problematic to pin down in neutrino measurements. To address this limitation, we investigate the weak process of polarized positron capture on the deuteron, e⃗ ++2H→ν¯e+p+p. Employing a relativistic momentum-space formalism, we present predictions for the total cross section. Focusing on the kinematic regime free from pion-production backgrounds, we analyze various differential cross sections and their sensitivity to the FA(Q2) variation. Our results demonstrate that thanks to the positron upgrade, Jefferson Lab will gain a unique position to make inroads into determining the low-Q2 behavior of the axial form factor.
Details
- Title: Subtitle
- Probing the nucleon axial form factor via the e⃗ ++2H→ν¯e+p+p reaction below the pion-production threshold
- Creators
- A. M AnkowskiJ GolakE. Pérez del RioS SharmaR SkibińskiK TopolnickiH WitałaW. N PolyzouH KamadaD Dutta
- Resource Type
- Preprint
- Publication Details
- arXiv, Vol.arXiv
- DOI
- 10.48550/arxiv.2609.22435
- ISSN
- 2331-8422
- Language
- English
- Date posted
- 09/18/2026
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9985231452502771
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