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

In the $J/\psi$ radiative decay channels $J/\psi\to \gamma V\bar{V}$, theresult of partial wave analysis indicates that the $V\bar{V}$ systems arepredominately pseudoscalar component, and most of these channels haverelatively large branching ratios at an order of $10^{-3}$. Meanwhile, vectormesons, such as $\rho$, $\omega$ and $K^*$, have strong couplings with nucleonsand/or hyperons. This suggests a dynamical mechanism describing the $\etap\bar{p}$ form factors for higher $\eta$ mesons, such as $\eta(1405/1475)$ and$\eta(1760)$. It is thus natural to expect that rescatterings of these vectormeson pairs into $p\bar{p}$ of $0^-$ partial wave could be an important sourcecontributing to $J/\psi\to\gamma p\bar{p}$ of which the branching ratio is atthe order of $10^{-4}$. Our calculation justifies this point. In particular, wefind that interferences between different rescattering amplitudes can produce asignificant threshold enhancement in the invariant mass spectrum of $p\bar{p}$.Without introducing dramatic ingredients, our model provides a naturalexplanation for the peculiar threshold enhancement observed by BES-II in$J/\psi\to \gamma p\bar{p}$. Additional experimental constraints on the$V\bar{V}\to p\bar{p}$ transitions are examined. This mechanism in $J/\psi\to\omega p\bar{p}$ is also discussed.

A possible mechanism for producing the threshold enhancement in $J/\psi\to\gamma p\bar{p}$