Speaker
Description
We investigate photo-production of vector mesons $J/\Psi$ and $\Psi(2s)$ and their potential use for finding evidence for the presence of non-linear QCD evolution at the LHC and future collider projects. Our study is based both on unintegrated gluon densities, subject to BK (non-linear) and NLO BFKL (linear) QCD low x evolution, and the study of dipole models. While the energy dependence of $\Psi(2s)$ and $J/\Psi$ photo-production cross-sections does not allow to distinguish between linear and non-linear QCD evolution, if we account for theoretical uncertainties, we find that the ratio of of $\Psi(2s)$ and $J/\Psi$ photo-production cross-sections remains approximately constant with energy for linear evolution, while it is rising non-linear evolution. We argue that this is observation is due to general features of the vector meson wave function and might therefore serve to observe and characterize the size of non-linear effects.
| Submitted on behalf of a Collaboration? | No |
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