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

By use of single instanton approximation the twist-3 light-cone distributionamplitudes of pion as well as the p-wave mesons, i.e., $f_{0}(1370)$,$K_{0}^{\ast}(1430)$ and $a_{0}(1450)$ are investigated within the framework ofQCD moment sum rules with inclusion of instanton effects based on the valencequark model. Results show that there is much change on light-cone distributionamplitudes by the isospin- and chirality-dependent instanton contributioncompared with the instanton-free ones. We find the intanton involved twist-3LCDAs are non-positive-definite within some range of momentum fraction andthere are rapid changes at two ends of momentum fraction. To guarantee theconvergence of moments by the method in this work a low instanton densityshould be adopted, for instance $n_{c}=1/2\rm{fm^{-4}}$ is welcomed. Possibleingredients which might have impact on the results are briefly discussed. Theselight-cone distribution amplitudes may be helpful to analyze exclusive heavyflavored processes.

Instanton effects on the twist-three light-cone distribution amplitudes of pion and light scalar mesons above 1GeV