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PreprintCC BY 4.0arXiv

Probing the nucleon axial form factor via the e⃗ + + 2H → ν̅e + p + p reaction below the pion-production threshold

  • A. M. Ankowski
  • J. Golak
  • E. Pérez del Rio
  • S. Sharma
  • R. Skibiński
  • K. Topolnicki
  • H. Witała
  • W. N. Polyzou
  • H. Kamada
  • D. Dutta
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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 → ν̅e + 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.

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Cite

BibTeXRIS
BibTeX
@misc{ankowski2026probing,
  title = {{Probing the nucleon axial form factor via the $\vece^\,+ + ^2\textH \rightarrow \barν_e + p + p$ reaction below the pion-production threshold}},
  author = {A. M. Ankowski and J. Golak and E. Pérez del Rio and S. Sharma and R. Skibiński and K. Topolnicki and H. Witała and W. N. Polyzou and H. Kamada and D. Dutta},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.22435},
  eprint = {2609.22435},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.22435},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Probing the nucleon axial form factor via the e⃗^ + + ^2H → ν̅_e + p + p reaction below the pion-production threshold
AU  - A. M. Ankowski
AU  - J. Golak
AU  - E. Pérez del Rio
AU  - S. Sharma
AU  - R. Skibiński
AU  - K. Topolnicki
AU  - H. Witała
AU  - W. N. Polyzou
AU  - H. Kamada
AU  - D. Dutta
PY  - 2026
DA  - 2026/09/18
PB  - arXiv
DO  - 10.48550/arxiv.2609.22435
UR  - https://arxiv.org/abs/2609.22435
AB  - The nucleon axial form factor F_A(Q^2) is a primary source of systematic uncertainty in charged-current quasielastic interactions, of critical importance for long-baseline neutrino-oscillation studies. Its low-Q^2 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 → ν̅_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 F_A(Q^2) variation. Our results demonstrate that thanks to the positron upgrade, Jefferson Lab will gain a unique position to make inroads into determining the low-Q^2 behavior of the axial form factor.
ER  -