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

The spectrum of $q^2\bar q^2, J^p=0^+,2^+$ mesons is discussed. We have shownthat due to instanton - induced forces the physical states are strong mixturesof the $SU_f(3)$ group basis states. The cross-sections for annihilation of the$N\bar N$ system into $(q^2\bar q^2)(q\bar q)$ mesons are obtained. The$a_0(980)$ meson is considered as $q^2\bar q^2$ meson consisting of $9_f$ and$36_f$ plets. The branchings are also predicted for the cross-sections forproduction of the $a_0(980)$ and tensor $q^2\bar q^2$ mesons in $N\bar N$annihilation.Comment: 28 pages, latex, 4 figures (one figure is available by request

Four-quark states and nucleon-antinucleon annihilation within the quark model with QCD vacuum-induced interaction