On the Photoproduction Reactions $\gamma d\to \pi NN$

Abstract

A review of our works providing a theoretical description of incoherent pion photoproduction on the deuteron is presented. The existing $\gamma d\to \pi NN$ data are analysed, especially those obtained more recently by the CLAS Collaboration at JLab, the A2 Collaboration at MAMI at Mainz, and the PION@MAX-lab Collaboration at Lund. A procedure, which accounts for the final state interactions (FSI), is applied to extract $\gamma n\to \pi N$ differential cross sections from the deuteron data. The role of FSI is discussed. We also comment on the results of other works in connection with some discrepancies seen in comparing the model with experiment. The electromagnetic properties of baryon $N^{\ast }$ resonances, improved using the extracted $\gamma n\to \pi N$ differential cross sections, are presented. A model description of the cross section data from charged-pion photoproduction reactions $\gamma d\to {\pi }^{\pm }NN$ near threshold is also given. The $\gamma d\to {\pi }^{-}pp$ data are used to extract the $E_{0+}$ multipole and total crsoss sections of the reaction $\gamma n\to {\pi }^{-}p$ near threshold.

35 pages, 10 figures, 2 tables

References in corpus (6)

• Unitary Isobar Model - MAID2007
• Extended Partial-Wave Analysis of piN Scattering Data
• Updated analysis of NN elastic scattering to 3 GeV
• Incoherent pion photoproduction on the deuteron in the first resonance region
• First measurement of the polarization observable $E$ and helicity-dependent cross sections in single ${\pi }^0$ photoproduction from quasi-free nucleons
• Helicity-dependent reaction \vec γ\vec d\to πNN and its contribution to the GDH sum rule for the deuteron