Helicity-dependent photoabsorption cross sections on the nucleon

Abstract

We examine the energy dependence of single-meson photoproduction as it contributes to the Gerasimov-Drell-Hearn (GDH) sum rule. For photon energies above approximately 1 GeV, through the full resonance region, this contribution dominates the proton sum rule integral. Over the same energy region, our single-pion contribution to the neutron sum rule also qualitatively follows a recent set of GDH data. The predicted neutral-pion contribution to the neutron sum rule is nearly zero above 1 GeV in this result. The SAID and Mainz (MAID) results are very different for a number of observables over this energy region.

7 pages, 5 figure

References in corpus (5)

• A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
• Analysis of Pion Photoproduction Data
• Dispersion Relation Constrained Partial Wave Analysis of piN Elastic and piN\to\etaN Scattering Data: The Baryon Spectrum
• Neutral pion photoproduction off protons in the energy range 0.3 GeV < E(gamma) < 3 GeV
• Parameterisation of σ_{1/2}-σ_{3/2} for Q^2 \geq 0 and non-resonance contribution to the GDH sum rule

Cited by in corpus (8)

• Baryon spectroscopy
• ${\pi }^{+}$ photoproduction on the proton for photon energies from 0.725 to 2.875 GeV
• Photoproduction of eta meson within a coupled-channels K-matrix approach
• P-wave excited baryons from pion- and photo-induced hyperon production
• The associated photoproduction of K+ meson off proton within a coupled-channels K-matrix approach
• Photo-absorption on deuteron contributed by d^*(2380) resonance
• Single-pion contribution to the Gerasimov--Drell--Hearn sum rule and related integrals
• Coupled-channel contributions to the GDH sum rule from the Jülich-Bonn approach