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 perform a QCD sum rule analysis for the scalar $f_0(980)$ meson toinvestigate whether it can be described as a pure bound state of $K$ and$\bar{K}$ mesons. Based on the QCD sum rule with the operators of up todimension 10 within the operator product expansion, we found that it is hard totreat the $f_0(980)$ as a simple $K\bar{K}$ bound state, which implies that the$f_0(980)$ scalar meson has more complicated structure being mixed states ofvarious configurations.

QCD sum rule study on the $f_0(980)$ structure as a pure $K \bar{K}$ bound state