resent <i>g(x)</i> at small 
<i>Q^2</i> scales, close to the lower cutoff for multiparton interactions. 
  

<p/>
When assigning relative momentum fractions to beam-remnant partons,
valence quarks are chosen according to a distribution like
<i>(1 - x)^power / sqrt(x)</i>. This <i>power</i> is given below 
for quarks in mesons, and separately for <i>u</i> and <i>d</i> 
quarks in the proton, based on the approximate shape of low-<i>Q^2</i> 
parton densities. The power for other baryons is derived from the 
pr