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

We observe that the ratio of the on-shell scattering amplitude to theBethe-Salpeter (BS) wave function outside the interaction range is almostindependent of time in our quenched calculation of the $I=2$ two-pionscattering with almost zero momentum. In order to discuss the timeindependence, we present a relation between the two-pion scattering amplitudeand the surface term of the BS wave function at the boundary. Using therelation under some assumptions, we show that the ratio is independent of timeif the two-pion four-point function in early time is dominated by scatteringstates with almost zero momentum in addition to the ground state of thetwo-pion scattering.

Two-pion scattering amplitude from Bethe-Salpeter wave function at the interaction boundary