# Saturation Effects in Deep Inelastic Scattering at low $Q^2$ and its Implications on Diffraction

## TL;DR

This paper introduces a saturation-based model for small $Q^2$ and $x$ in deep inelastic scattering, effectively describing data, including charm and photoproduction, and explaining the ratio of diffractive to inclusive cross sections.

## Contribution

The paper presents a simple, three-parameter saturation model that accurately describes low $Q^2$, low $x$ DIS data and extends to photoproduction regimes.

## Key findings

- Good fit to DIS data below $x=0.01$
- Consistent treatment of charm quarks
- Explains constant ratio of diffractive to inclusive cross sections

## Abstract

We present a model based on the concept of saturation for small $Q^2$ and small $x$. With only three parameters we achieve a good description of all Deep Inelastic Scattering data below $x=0.01$. This includes a consistent treatment of charm and a successful extrapolation into the photoproduction regime. The same model leads to a roughly constant ratio of diffractive and inclusive cross section.