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 analyze contributions to the heavy vector meson production with largetransverse momentum in proton--proton and diffractive photon--proton scatteringdriven by an exchange of two Balitsky--Fadin--Kuraev--Lipatov Pomerons in thesquared amplitudes. The Pomerons couple to a single parton and form a Pomeronloop closed by the vector meson impact factors. For the photon--proton case thediffractive cut of the Pomeron loop contributes, and for the inclusivehadroproduction one finds the loop with two cut Pomerons. We compute both ofthese Pomeron loop contributions and study in detail their properties. Theresults are then used to calculate the cross sections for diffractive $J/\psi$photoproduction with large transverse momentum at HERA and the correlated twoPomeron contribution for inclusive $J/\psi$ and $\Upsilon$ production crosssections at the LHC. Within a unified approach a good description of thephotoproduction data is found, but correlated two Pomeron mechanism gives onlya small contribution to hadroproduction of the vector mesons at the LHC.

BFKL Pomeron loop contribution in diffractive photoproduction and inclusive hadroproduction of $J/\psi$ and $\Upsilon$