# A model for $F_L$ structure function at low values of $Q^2$ and $x$ - revisited

### Submission summary

 Authors (as Contributors): Anna Stasto
Submission information
Date accepted: 2021-09-02
Date submitted: 2021-08-26 16:10
Submitted by: Stasto, Anna
Submitted to: SciPost Physics Proceedings
Proceedings issue: DIS2021
Ontological classification
Specialties:
• High-Energy Physics - Phenomenology
Approach: Phenomenological

### Abstract

A reanalysis of the model for the longitudinal structure function $F_L (x,Q^2)$ at low $x$ and low $Q^2$ was undertaken, in view of the advent of the EIC. The model includes the kinematic constraint $F_L\sim Q^4$ as $Q^2\rightarrow$ 0. It is based on the photon-gluon fusion mechanism suitably extrapolated to the region of low $Q^2$. Revised model was critically updated, extended to the EIC kinematic region, and e.g. contains new parameterisations of the parton distribution functions.

Published as SciPost Phys. Proc. 8, 082 (2022)

question and resolved the problem with the figure caption for fig.2.

### List of changes

Fig. 2 caption has been updated