Dipole model analysis of the new HERA I+II data

TL;DR

This paper demonstrates that the dipole model, complemented with valence quark structure functions, effectively describes HERA I+II inclusive DIS data and explores gluon density and saturation effects using the BGK dipole model within the xFitter framework.

Contribution

It provides a detailed analysis of HERA data using the BGK dipole model with DGLAP evolution, offering an alternative to traditional PDF approaches and investigating saturation effects.

Findings

Good description of HERA data with dipole model

Confirmation of previous gluon density results

Preliminary insights into saturation phenomena

Abstract

We use the dipole model to analyze the inclusive DIS cross section data, obtained from the HERA I+II measurements \cite{Abramowicz:2015mha}. We show that these combined data are very well described within the dipole model framework, which is complemented with a valence quark structure functions. Our motivation is to investigate the gluon density with the BGK dipole model \cite{BGK} as an alternative to the PDF approach. BGK dipole model uses for evolution the DGLAP mechanism in the $kt$ factorization scheme (in contrast to the collinear factorization for PDFs). We confirm our results from the previous paper \cite{Luszczak:2013rxa} with old HERA data \cite{HERA2010}. In addition we also performed a first, preliminary investigation of saturation. The analysis was done in the xFitter framework \cite{xFitter,xFitter2,xFitter3,xFitter4,xFitter5}.}