Electromagnetic structure of the deuteron

Abstract

Recent measurements of the deuteron electromagnetic structure functions A, B, and T 20 extracted from high energy elastic ed scattering, and the cross sections and asymmetries extracted from high energy photodisintegration γ + d → n + p, are reviewed and compared to theory. The theoretical calculations range from nonrelativistic and relativistic models using the traditional meson and baryon degrees of freedom, to effective field theories, to models based on the underlying quark and gluon degrees of freedom of QCD, including nonperturbative quark cluster models and perturbative QCD. We review what has been learned from these experiments, and discuss why elastic ed scattering and photodisintegration seem to require very different theoretical approaches, even though they are closely related experimentally.

Cross section measurements of charged pion photoproduction in hydrogen and deuterium from 1.1 to 5.5 GeV

“…On the experimental side, the constituent counting rule is consistent with data for many exclusive processes, such as pp elastic scattering [5], hadron-hadron elastic scattering [6], and deuteron photodisintegration [7,8,28]. The fitted power of 1 s from the pp elastic scattering data with s > 15 GeV 2 and |t| > 2.5 GeV 2 is equal to 9.7 ± 0.5 [5], consistent with 10 as predicted by the constituent counting rule.…”

“…This rule was first derived from simple dimensional counting [1][2][3] and was later confirmed in a short-distance pQCD approach [4]. It is consistent with many exclusive measurements [5][6][7][8][9][10]. However, there are still many puzzles.…”

Coarse-grainedNNpotential with chiral two-pion exchange

“…[35] for a review) are depicted in Fig. 2 and come out with tiny error bands that cannot be distinguished within the plot scale from the ones obtained with OPE only in our previous work [15].…”

Signatures of the chiral two-pion exchange electromagnetic currents in theH2andHe3Rozpędzik1, Golak2, Kölling3 et al. 2011Phys. Rev. C313541View full textAdd to dashboardCite

“…One of the fundamental processes observed for the deuteron is the photodisintegration reaction. It has been a subject of intense experimental and theoretical research for several decades (see Refs [7,8]). Also photodisintegration of 3 He has been studied experimentally and theoretically for a long time [9][10][11].…”