Longitudinal Double Spin Asymmetries of pi(0) - Jet Correlations in Polarized Proton Collisions at root s=510 GeV at STAR

One of the primary goals of the spin physics program at STAR is to constrain the polarized gluon distribution function, Delta g(x), by measuring the longitudinal double-spin asymmetry (A(LL)) of various final-state channels. Using a jet in the mid-rapidity region vertical bar eta vertical bar < 0.9 correlated with an azimuthally back-to-back pi(0) in the forward rapidity region 0.8 < eta < 2.0 provides a new possibility to access the Delta g(x) distribution at Bjorken-x down to 0.01. Compared to inclusive jet or inclusive pi(0) measurements, this channel also allows to constrain the initial parton kinematics. In these proceedings, we will present the status of the analysis of the pi(0) -jet A(LL) in longitudinally polarized proton+proton collisions at root s =510 GeV with 80 pb(-1) of data taken during the 2012 RHIC run. We also compare the projected A(LL) uncertainties to theoretical predictions of the A(LL) by next- to-leading order (NLO) model calculations with different polarized parton distribution functions.