26-31 July 2021
Mexico City
Mexico/General timezone
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Contribution Parallel

Mexico City -
QCD and Hadron Structure

First analysis of world polarized DIS data with small-$x$ helicity evolution


  • Mr. Daniel ADAMIAK

Primary authors



We present the first-ever description the world data on the $g_1^{p,n}$ structure function at small Bjorken $x$ using evolution equations in $x$ derived from first principles QCD. This analysis within the JAM global framework that allows us to fit all existing polarized DIS data below $x<0.1$ as well as predict future measurements of small $x$ $g_1^{p,n}$ at the EIC. This is a necessary step in determining the quark helicity PDFs and, ultimately, the quark contribution to the proton spin.