Threshold pion electro- and photoproduction off nucleons in covariant chiral perturbation theory

2020/08/10 by Gustavo H. Guerrero Navarro, M. J. Vicente Vacas · 12 citations
Physics and Astronomy · #Baryon #Chiral perturbation theory #Covariant transformation #High-Energy Particle Collisions Research #Mathematical physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Perturbation theory (quantum mechanics) #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Resonance (particle physics) #hep-ph

paper · pdf · doi:10.1103/physrevd.102.113016

published in Physical review. D/Physical review. D. 102(11) (American Physical Society)

arxiv created 2020/08/10 · openalex created_date 2020/08/13 · openalex publication_date 2020/12/30 · arxiv updated 2021/01/04 · openalex updated_date 2026/08/05

Abstract

Pion electro- and photoproduction off the nucleon close to threshold is studied in covariant baryon chiral perturbation theory at O(p³) in the extended-on-mass-shell scheme, with the explicit inclusion of the \mathrm\ensuremathΔ(1232) resonance. The relevant low energy constants are fixed by fitting the available experimental data with the theoretical model. The inclusion of the \mathrm\ensuremathΔ resonance as an explicit degree of freedom substantially improves the agreement with data and the convergence of the model.

Citations

• Invariant amplitudes for pion electroproduction
• Aspects of near-threshold neutral pion photoproduction off protons
• Separated cross-sections in π⁰ electroproduction at threshold at Q2 = 0.05GeV2/c2
• Measurement of the p ( e , e ′ π + ) n reaction close to threshold and at low Q 2
• Review of Particle Physics
• Electromagnetic form factors of the nucleon in chiral perturbation theory