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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

A systematic study of the $\eta$-$\eta'$ mixing in Large-$N_c$ chiralperturbation theory is presented with special emphasis on the role of thenext-to-next-to-leading-order contributions in the combined momentum,quark-mass, and $1/N_c$ expansions. At this order, loop corrections as well asOZI-rule-violating pieces need to be included. Mixing angles as well aspseudoscalar decay constants are discussed within this framework. The resultsare compared with recent phenomenological approaches.

$\eta$-$\eta'$ mixing in large-$N_c$ chiral perturbation theory: discussion, phenomenology, and prospects