Exchange effects in photon scattering off the deuteron

Deuteron Compton scattering below pion photoproduction threshold

“…At this point we disagree with the results of Ref. [37], in which it was found that the effect of the ∆-excitation onto the resonance amplitude at 100 MeV is negligible at small angles and very large at Θ γ ≥ 90 • giving a +15% increase in dσ/dΩ.…”

“…After then a number of calculations has been performed in 50's and 60's, mostly based on the impulse approximation [36]. A higher level of art, with an explicit consideration of MEC and of their influence on the so-called resonance and seagull amplitudes of Compton scattering was introduced by Weyrauch and Arenhövel [37]. They directly calculated the seagull contribution from the pion exchange and developed an approximate scheme based on dispersion relations in the long wave-length limit to find the resonance amplitude of Compton scattering from a theoretically known deuteron photodisintegration amplitude.…”

Tensor polarized γ-deuteron Compton scattering in effective field theory

“…It is also interesting to compare our results with those from potential model calculations [32,33]. In Fig.…”

“…In Fig. 7, we show the fist non-vanishong order (NLO) results of F 2 and G 2 multiplied by a constant to compare with the form factors P 2(E1, E1) and P 2(M1, M1) calculated and plotted in [32]. The agreement on G 2 is ∼ 10% while the agreement on F 2 is ∼ 30-40%.…”

“…(2.8) F 2 and G 2 are related to the form factors P 2(E1, E1) and P 2(M1, M1) defined in [32,33] by a normalization factor. At LO, F 2 and G 2 vanish,…”