Dipole model analysis of the new HERA I+II data

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}.}