  The propagation of QCD color through atomic nuclei is studied via a new
analysis using a geometric model of semi-inclusive deep inelastic scattering.
The experimental data were previously published by the HERMES Collaboration and
consisted of the multiplicity ratio observable (2007) and the transverse
momentum broadening observable (2010). We perform a simultaneous fit of these
two observables to estimate (1) the color lifetime of the quark, (2) quark
energy loss, (3) the $\hat{q}$ transport coefficient, and (4) the cross section
for hadronic interaction with the medium. We present preliminary results for
this fit.
