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We report a measurement of the fraction of top quark pair events produced viagluon-gluon fusion in $p\bar{p}$ collisions at $\sqrt{s} = 1.96 ~\rm TeV$ inlepton+jets final states using the full RunII data set corresponding to $9.7~\rm fb^{-1}$ of integrated luminosity collected by the D\O\ experiment. Weutilize a boosted decision tree to distinguish top quark pair events producedby $q\bar{q}$ annihilation and $gg$ fusion. We perform a template fit toextract the $t\bar{t}$ production fraction via $gg$ fusion and find $f_{gg} =0.096 \pm 0.039 ~(\rm stat.) ~^{+0.077}_{-0.062} ~(\rm syst.)$.

Measurement of the fraction of top quark pair events produced via gluon-gluon fusion at the Tevatron in lepton+jets final states