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

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arxiv 2107.08395 v2 pith:VRZVG7XO submitted 2021-07-18 hep-ph

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

classification hep-ph
keywords fluctuationshotspotssubstructurecross-sectiondatadensitydipoleevents
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The information on the gluonic structure and its fluctuations is captured by the differential $|t|$ spectrum in diffractive events. The incoherent cross-section is sensitive to the fluctuations in the target wavefunction in such events. We investigate the incoherent $ep$ cross-section in $J/\psi$ photoproduction using the impact-parameter dependent dipole model. The spatial gluonic structure is modelled as hotspots of gluon density having substructure where this substructure is modelled as hotspots within hotspots. We find that three 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 the saturated and non-saturated dipole models and compare our predictions with the HERA Data.

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