The fundamental Gerasimov-Drell-Hearn (GDN) sum rule for the proton was examined in the photon energy range from 0.2-2.9 GeV using tagged photon facilities. The data for the polarized total cross section difference were in the energy range from 1.6 to 2.9 GeV. For photon energies below 0.20 GeV the unitary isobar model MAID2002 gave(-27.5±3) and SAID gave -28μb. It is observed that the experimental results from MAMI and ELSA yielded an estimate for full integral between ≈212 and ≈214μb which was in good accord with the GDH sum rule value of 205 μb.
ASJC Scopus subject areas
- Physics and Astronomy(all)