Constraining the Polarized Gluon Distribution Through Di-jet Measurements at $\sqrt{s} = 510$ GeV at STAR

The production of jets from polarized p+p collisions at STAR is dominated by quark-gluon and gluon-gluon scattering. The di-jet double spin asymmetry ($A_{LL}$) is sensitive to the polarized gluon distribution ($\Delta G$). Di-jets are also advantageous because the parton momentum fraction, x, of initial partons may be reconstructed to first order from the final state measurements. Both jet and di-jet $A_{LL}$ measurements at $\sqrt{s}$ = 200 GeV have helped to constrain $\Delta G$ to values of x $\approx$ 0.05. In 2012, data were collected at $\sqrt{s}$ = 510 GeV in order to probe lower values of x. Jet and di-jet preliminary $A_{LL}$ results have been released and will soon be incorporated into theoretical fits. In 2013, data were also collected at $\sqrt{s}$ = 510 GeV. An update on the di-jet $A_{LL}$ measurement using polarized p+p data collected at STAR during 2013, with an estimated 250 pb$^{-1}$ of integrated luminosity will be presented.