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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We derive formalism for determining $\textbf{2} + \mathcal J \to \textbf{2}$infinite-volume transition amplitudes from finite-volume matrix elements.Specifically, we present a relativistic, model-independent relation betweenfinite-volume matrix elements of external currents and the physicallyobservable infinite-volume matrix elements involving two-particle asymptoticstates. The result presented holds for states composed of two scalar bosons.These can be identical or non-identical and, in the latter case, can be eitherdegenerate or non-degenerate. We further accommodate any number ofstrongly-coupled two-scalar channels. This formalism will, for example, allowfuture lattice QCD calculations of the $\rho$-meson form factor, in which theunstable nature of the $\rho$ is rigorously accommodated.

Relativistic, model-independent, multichannel $2\to2$ transition amplitudes in a finite volume