Helicity-dependent reaction \vec γ\vec d\to πNN and its contribution to the GDH sum rule for the deuteron

Abstract

Helicity-dependent incoherent pion photoproduction in the reaction \vec γ\vec d\to πNN is studied in the framework of the diagrammatic approach. Contributions to the reaction amplitude from diagrams corresponding to impulse approximation as well as NN and πN interactions in the final state have been evaluated. The elementary γN\to πN operator is taken from the MAID and SAID models. A detailed comparison of the predictions with recent experimental data by the GDH and A2 collaborations at energies below 500 MeV is presented. Reasonable agreement with the data on the yields and cross sections for polarized beam and polarized target has been achieved in all channels. The unpolarized data of the GDH and A2 collaborations have also been analyzed within the approach. A strong overestimation for the neutral channel has been found. At the same time, the model provides a quite satisfactory description of the unpolarized data for the charged channels. The sensitivity of the obtained results to the choice of the elementary γN\to πN operator is discussed in detail. The contribution of the γd\to πNN reaction to the GDH sum rule for the deuteron up to a photon energy of 1.65 GeV has been evaluated with the result of 235\pm 25 \mub.

arXiv comment17 pages, 14 figures, references added

References in corpus (16)

• The high-precision, charge-dependent Bonn nucleon-nucleon potential (CD-Bonn)
• Construction of high-quality Nucleon-Nucleon potential models
• A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
• Unitary Isobar Model - MAID2007
• Analysis of Pion Photoproduction Data
• First measurement of the Gerasimov-Drell-Hearn integral for Hydrogen from 200 to 800 MeV
• Influence of final state interaction on incoherent pion photoproduction on the deuteron in the region of the Delta-resonance
• Effective Lagrangian Approach to pion photoproduction from the nucleon
• Incoherent pion photoproduction on the deuteron with polarization observables II: Influence of final state rescattering
• Spin Asymmetry and Gerasimov-Drell-Hearn Sum Rule for the Deuteron
• Incoherent pion photoproduction on the deuteron in the first resonance region
• Incoherent pion photoproduction on the deuteron with polarization observables I: Formal expressions
• The Gerasimov-Drell-Hearn Sum Rule
• Meson-exchange $\pi N$ Models in Three-Dimensional Bethe-Salpeter Formulation
• Measurements of polarized photo-pion production on longitudinally polarized HD and Implications for Convergence of the GDH Integral
• The reaction ${}^{2}H(\gamma ,{\pi }^0)np$ in the threshold region

Cited by in corpus (3)

• Extracting the photoproduction cross section off the neutron gn-->pi-p from deuteron data with FSI effects
• On the Photoproduction Reactions $\gamma d\to \pi NN$
• Photoproduction of ${\pi }^0$-Mesons on the Nucleon and Deuteron