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 Tools annual

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 Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Some form factors of ground-state hadrons with spin might show a zerocrossing at spacelike momenta of electron-hadron scattering. In the timelikeregion of hadron-antihadron production by electron-positron collisions the formfactors become complex. When the hadrons decay, the relative phases betweenform factors can be measured by the angular distributions of their decayproducts. Using analyticity and the QCD high-energy limits for constraint-freeform factors and for helicity amplitudes, we show how a single zero crossing inthe spacelike region is related to the high-energy limit of the phase in thetimelike region. Theoretical predictions for such zero crossings can thereforebe tested by experimental measurements, e.g. by Belle II, in the high-energytimelike region. In the present work, this line of reasoning is applied tovector mesons.

Spacelike zero crossings and timelike phases in the electromagnetic form factors of vector mesons