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We report the first measurement of the longitudinal double-spin asymmetry$A_{LL}$ for mid-rapidity di-jet production in polarized $pp$ collisions at acenter-of-mass energy of $\sqrt{s} = 200$ GeV. The di-jet cross section wasmeasured and is shown to be consistent with next-to-leading order (NLO)perturbative QCD predictions. $A_{LL}$ results are presented for two distincttopologies, defined by the jet pseudorapidities, and are compared topredictions from several recent NLO global analyses. The measured asymmetries,the first such correlation measurements, support those analyses that findpositive gluon polarization at the level of roughly 0.2 over the region ofBjorken-$x > 0.05$.

Measurement of the cross section and longitudinal double-spin asymmetry for di-jet production in polarized $pp$ collisions at $\sqrt{s}$ = 200 GeV