6533b829fe1ef96bd1289ba9
RESEARCH PRODUCT
Dispersive evaluation of the D-term form factor in deeply virtual Compton scattering
Maxim V. PolyakovMarc VanderhaeghenBarbara PasquiniBarbara Pasquinisubject
Particle physicsNuclear and High Energy PhysicsNuclear Theorynucl-thNuclear TheoryFOS: Physical sciencesnucl-ex01 natural sciencesHigh Energy Physics - ExperimentNuclear Theory (nucl-th)High Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)Dispersion relation0103 physical sciencesNuclear Experiment (nucl-ex)010306 general physicsDispersion (water waves)Generalized parton distributionsNuclear ExperimentNuclear ExperimentPhysicsUnitarity010308 nuclear & particles physicshep-exHigh Energy Physics::PhenomenologyCompton scatteringForm factor (quantum field theory)hep-phFunction (mathematics)Helicitylcsh:QC1-999High Energy Physics - PhenomenologyAmplitudeQuantum electrodynamicsHigh Energy Physics::ExperimentDeeply virtual Compton scatteringlcsh:PhysicsDispersion relationsdescription
We present a dispersive representation of the D-term form factor for hard exclusive reactions, using unsubtracted $t$-channel dispersion relations. 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 parametrizations.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-12-01 |