Constraining $\Delta G$ at Low-x with Double Longitudinal Spin Asymmetries of Hadrons at Forward Rapidity in PHENIX

At low Bjorken-x, $x<0.05$, the proton structure is heavily gluon dominated. However, in this kinematic region, the gluon polarization, $\Delta G$, and hence its contribution to the net proton spin, remains weakly constrained. To map out the gluon polarization at low-x and distinguish between various theoretical models with the best sensitivity, it is necessary to measure the asymmetry, $A_{LL}$, in high $p_{T}$ hadrons in the forward direction ($3.1<|\eta|<3.9$) from longitudinally polarized protons. We will report the current status of the single $\pi^{0}$ measurements. In addition, we have upgraded the electronics and triggering of our forward calorimeter to be able to trigger on di-hadron events as well. The new trigger will be used first during the 2012 RHIC run. This measurement is particularly interesting because it provides the best sensitivity to low-x gluons, with $x\sim$ few $\times10^{-3}$, that participate in highly asymmetric interactions. We will report on the performance of our new trigger as the run in progress continues. Both the single and di-hadron measurements will provide valuable low-x input for future global analyses of $\Delta G$.