9-14 September 2018
University of Ferrara
Europe/Rome timezone
23RD INTERNATIONAL SPIN SYMPOSIUM

The D-term form factor from dispersion relations in deeply virtual Compton scattering

11 Sep 2018, 14:30
35m
A5 (Polo degli Adelardi - Via Adelardi, 33)

A5

Polo degli Adelardi - Via Adelardi, 33

Via Adelardi, 33
Parallel Sessions 3D Structure of the Nucleon: GPDs and Form Factors 3D Structure of the Nucleon: GPDs and Form Factors

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

Co-authors

Prof. Marc Vanderhaeghen (University Mainz) Prof. Maxim Polyakov (Ruhr-University Bochum)

Presentation Materials