Threshold Two-Pion Photo- and Electroproduction: More neutrals than expected

Abstract

We present an exploratory study of two pion photo-- and electroproduction off the nucleon in the threshold region. To calculate the pertinent amplitudes, we make use of heavy baryon chiral perturbation theory. We show that due to finite chiral loops the production cross section for final states with two neutral pions is considerably enhanced. The experimental implications are briefly discussed.

23pp, plain TeX, 11 figures available upon request, CRN 94/14

References in corpus (4)

• Recent Developments in Chiral Perturbation Theory
• Chiral Dynamics and Heavy-Fermion Formalism in Nuclei: I. Exchange Axial Currents
• Consistent Calculation of the Nucleon Electromagnetic Polarizabilities in Chiral Perturbation Theory Beyond Next-to-Leading Order
• Threshold Pion Electroproduction in Chiral Perturbation Theory

Cited by in corpus (27)

• Chiral perturbation theory
• Many Body approach to the inclusive $(e,e^{\prime })$ reaction from the quasielastic to the $\Delta$ excitation region
• Double Pion Photoproduction on the Nucleon: Study of the Isospin Channels
• Theoretical study of the N N --> N N pi pi reaction
• The reaction $\pi N\to \pi \pi N$ at threshold in chiral perturbation theory
• Photocouplings at the Pole from Pion Photoproduction
• Threshold Pion Electroproduction in Chiral Perturbation Theory
• Phenomenological analysis of the double pion production in nucleon-nucleon collisions up to 2.2 GeV
• The $\sigma$ meson in a nuclear medium through two pion photoproduction
• Photoproduction of pi0pi0 and pi0pi+-pairs off the proton from threshold to the second resonance region
• Double ${\pi }^0$ Photoproduction off the Proton at Threshold
• Double and single pion photoproduction within a dynamical coupled-channels model
• Model Selection for Pion Photoproduction
• The reaction $\pi N\to \pi \pi N$ above threshold in chiral perturbation theory
• Novel Pion Electroproduction Low-Energy Theorems
• Evaluation of the polarization observables I^S and I^C in the reaction gamma p --> pi^0 eta p
• Elastic and inelastic pion-nucleon scattering to fourth order in chiral perturbation theory
• Double neutral pion photoproduction at threshold
• The reaction pi N to pi pi N in a meson-exchange approach
• The Reaction $\pi N\to \pi \pi N$ at Threshold
• A model for pion Delta electroproduction on the proton
• Baryon Chiral Perturbation Theory A.D. 1994
• Coherent two pion photoproduction on 12C
• Theory of two-pion photo- and electroproduction off the nucleon
• Chiral perturbation theory calculation for pn -> dpipi at threshold
• Threshold Pion Photo- and Electroproduction in Chiral Perturbation Theory
• The chiral limit of QCD and above