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

We present a holographic analysis of diffractive photoproducton of charmonium$J/\psi$ and upsilonium $\Upsilon$ on a proton, considered as a bulk Diracfermion, for all ranges of $\sqrt{s}$, i.e., from near threshold to very highenergy. Using the bulk wave functions of the proton and vector mesons, withinholographic QCD, and employing Witten diagrams in the bulk, we compute thediffractive photoproduction amplitude of $J/\psi$ and $\Upsilon$. Theholographic amplitude shows elements of the strictures of vector mesondominance (VMD). It is dominated by the exchange of a massive graviton or$2^{++}$ glueball resonances near threshold, and its higher spin-j counterpartsthat reggeize at higher energies. Both the differential and total crosssections are controlled by the gravitational form factor $A(t)$, and comparewell to the recent results reported by the GlueX collaboration near thresholdand the world data at large $\sqrt{s}$. The holographic gravitational formfactors, including the D-term, which is due to the exchange of massive spin-0glueballs, are in good agreement with lattice simulations. We use it to extractthe holographic pressure and shear forces inside the proton. Finally, using apertinent integral representation of the holographic gravitational form factor$A(t)$ near threshold, and its Pomeron counterpart way above threshold, weextract the generalized parton distribution (GPD) of gluons inside the protonat different resolutions.

Diffractive photoproduction of $J/\psi$ and $\Upsilon$ using holographic QCD: gravitational form factors and GPD of gluons in the proton