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

We study $\bar{Q}Q\bar{q}q$ and $\bar{Q}qQ\bar{q}$ states as mixed states inQCD sum rules. By calculating the two-point correlation functions of purestates of their corresponding currents, we review the mass and couplingconstant predictions of $J^{PC}=1^{++}$, $1^{--}$, $1^{-+}$ states. Bycalculating the two-point mixed correlation functions of $\bar{Q}Q\bar{q}q$ and$\bar{Q}qQ\bar{q}$ currents, and we estimate the mass and coupling constants ofthe corresponding `"physical state" that couples to both $\bar{Q}Q\bar{q}q$ and$\bar{Q}qQ\bar{q}$ currents. Our results suggest that $1^{++}$ states are morelikely mixing from $\bar{Q}Q\bar{q}q$ and $\bar{Q}qQ\bar{q}$ components, whilefor $1^{--}$ and $1^{-+}$ states, there is less mixing between$\bar{Q}Q\bar{q}q$ and $\bar{Q}qQ\bar{q}$. Our results suggest the $Y$ seriesof states have more complicated components.

Mixing of X and Y states from QCD Sum Rules analysis