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

### Submission summary

 As Contributors: Arjun Kumar Arxiv Link: https://arxiv.org/abs/2107.08395v1 (pdf) Date submitted: 2021-07-26 09:59 Submitted by: Kumar, Arjun Submitted to: SciPost Physics Proceedings Proceedings issue: DIS2021 Academic field: Physics Specialties: High-Energy Physics - Phenomenology Approaches: Theoretical, Phenomenological

### Abstract

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.

###### Current status:
Editor-in-charge assigned

### Submission & Refereeing History

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Submission 2107.08395v1 on 26 July 2021