Exclusive J/psi photoproduction at the LHC favors a gluon distribution with nonlinear saturation corrections over linear BFKL-based predictions, suggesting onset of gluon saturation.
The hard to soft Pomeron transition in small x DIS data using optimal renormalization
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abstract
We show that it is possible to describe the effective Pomeron intercept, determined from the HERA Deep Inelastic Scattering data at small values of Bjorken x, using next-to-leading order BFKL evolution together with collinear improvements. To obtain a good description over the whole range of Q^2 we use a non-Abelian physical renormalization scheme with BLM optimal scale, combined with a parametrization of the running coupling in the infrared region.
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Signs for the onset of gluon saturation in exclusive photo-production of vector mesons
Exclusive J/psi photoproduction at the LHC favors a gluon distribution with nonlinear saturation corrections over linear BFKL-based predictions, suggesting onset of gluon saturation.