Speaker
Wolfgang Schaefer
(Institute of Nuclear Physics PAN)
Description
The amplitude for $\gamma p \to V p$, where $V$ is a $J/\psi$ or $\Upsilon$ ground state or excited
vector meson, is calculated in a pQCD $k_{T}$-factorization approach.
We use this amplitude to predict
the cross section for exclusive photoproduction of $J/\psi, \psi'$ mesons in proton-proton collisions.
Calculations are performed for a variety of unintegrated gluon distributions, and we compare our results
to LHCb data.
Here we especially focus on diffractive production in proton dissociative events.
We notice, that electromagnetic dissociation is calculable directly from proton structure functions without additional free parameters.
Besides being of interest in their own right, dissociative events constitute an important experimental background to exclusive production.
Primary author
Wolfgang Schaefer
(Institute of Nuclear Physics PAN)
Co-authors
Anna Cisek
(University of Rzeszow, Rzeszow)
antoni szczurek
(Institute of Nuclear Physics, Krakow and Rzeszow University, Rzeszow)
