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

Using collinear factorization, we have calculated twist-six corrections to$\eta\gamma$ and $\eta^{\prime}\gamma$ transition form factors in QCD. Only asub-set of light-cone operators of twist-six which can be factorized as aproduct of two gauge invariant operators has been considered. Resulting powercorrections start as $1/Q^{4}$ but coefficients are smaller compared to theircounterparts for twist-four operators. Matrix element of pseudoscalar quarkdensities for $u$- and $d$-quarks between vacuum and meson state, $h_{q}$, hasconsiderable influence on the result. Results obtained by superimposing ourresults on those obtained in literature for leading and sub-leading powercorrections for lower twists have been plotted and compared with data.

Sub-leading power corrections to transition form factors of $\eta$ and $\eta^{\prime}$ mesons from twist-six contributions