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The information on the gluonic structure and its fluctuations is captured bythe differential $|t|$ spectrum in diffractive events. The incoherentcross-section is sensitive to the fluctuations in the target wavefunction insuch events. We investigate the incoherent $ep$ cross-section in $J/\psi$photoproduction using the impact-parameter dependent dipole model. The spatialgluonic structure is modelled as hotspots of gluon density having substructurewhere this substructure is modelled as hotspots within hotspots. We find thatthree levels of the substructure provide a good description of all the data,available up to $|t|=30~$GeV$^2$. We investigate these fluctuations in both thesaturated and non-saturated dipole models and compare our predictions with theHERA Data.

Probing gluon density fluctuations at large momentum transfer $|t|$ at HERA