Speaker
Barbara Pasquini
(PV)
Description
We review the dispersion analysis of deeply virtual Compton scattering and present a dispersive representation of the D-term form factor for hard exclusive reactions. We use unsubtracted $t$-channel dispersion relations, where the $t$-channel unitarity relation is saturated with the contribution of two-pion intermediate states, using the two-pion distributions amplitude for the $\gamma^*\gamma\rightarrow \pi\pi$ subprocess and reconstructing the $\pi\pi\rightarrow N\bar N$ subprocess from available information on pion-nucleon partial-wave helicity amplitudes.
Results for the D-term form factor as function of $t$ as well as at $t=0$ are discussed in comparison with available model predictions and phenomenological extractions.
Primary author
Barbara Pasquini
(PV)
Co-authors
Prof.
Marc Vanderhaeghen
(University Mainz)
Prof.
Maxim Polyakov
(Ruhr-University Bochum)
