English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The two photon exchange amplitude is investigated in frame of analyticproperties of the virtual Compton scattering amplitude as a function of theinvariant mass squared of the intermediate hadronic state. A sum rule is built,based on arguments from analyticity. It relates the differential cross sectionof elastic electron-proton scattering including form factors, and the crosssection of inelastic scattering channel, with a contribution of nucleonanti-nucleon pair production arising from the Fermi statistics. The last termis calculated in frame of a simple model of nucleon-pion interaction.

Sum rule for the double virtual Compton scattering