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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We investigate whether NLO BFKL evolution is capable to describe the energydependence of the exclusive photo-production cross-section of vector mesons$J/\Psi$ and $\Upsilon$ on protons. Our description is based on available NLOBFKL fits of the proton impact factor in inclusive DIS, which allow us toconstruct the necessary scattering amplitude at zero momentum transfer $t=0$.Assuming an exponential drop-off with $t$, this result allows us to calculatethe exclusive photoproduction cross-section. Comparing our results with bothHERA data (measured by H1 and ZEUS collaborations in $ep$ collision) and LHCdata (measured by ALICE, CMS and LHCb collaborations in ultra-peripheral $pp$and $pPb$ collision) we find that our framework provides a very gooddescription of the energy dependence of the $J/\Psi$ and $\Upsilon$photoproduction cross-section, providing therefore further evidence for BFKLevolution at the LHC. The available fits of the proton impact factor require onthe other hand an adjustment in the overall normalization.

The growth with energy of exclusive $J/\Psi$ and $\Upsilon$ photo-production cross-sections and BFKL evolution