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This contribution presents the most recent mid-rapidity inclusive jet results from 3 pb 1 of data collected from longitudinally polarized proton collisions at p s = 200 GeV during the 2005 RHIC run. The inclusive jet asymmetry, ALL, with it’s increased transverse momentum range and precision, provides strong constraints on the gluon helicity distribution when compared with existing next-to-leading order perturbative QCD evaluations. Measurements of the partonic helicity distribution functions in the proton are essential for a complete understanding of the long range, non-perturbative properties of Quantum Chromodynamics (QCD). Three decades of polarized lepton-nucleon deep-inelastic-scattering (DIS) experiments [2] have shown that the probability for a quark spin to be aligned with the spin of the parent proton is 25%. Conservation of angular momentum requires the quark ( Q) and gluon ( G) total spin and orbital angular momentum (LQ + LG) within the proton to sum to ~ , motivating investigations into the size of the remaining components of the sum rule. Traditional fixed-target DIS experiments couple to the gluon distributions only at next-to-leading order (NLO), providing limited constraints on G[3][4]. As a result, several programs designed to directly access G have been established and have produced initial results [5][6][7][8][9]. Measurements of higher statistical precision and broader Q 2 reach continue to be recorded and released [10]. During the 2005 RHIC run STAR sampled 3 pb 1 of proton collisions with an average longitudinal beam polarization of 50% and p s = 200 GeV. As a result, the inclusive jet asymmetry measurement, spanning a transverse momentum (pT ) range of 5 32 GeV, represents the most precise measurement over the largestpT range to date. The Solenoidal Tracker at RHIC (STAR) Collaboration utilizes the polarized proton beam provided by the Relativistic Heavy Ion Collider (RHIC) to study final state interactions resulting from quark-quark (qq), quark-gluon (qg) and gluon-gluon (gg) scattering. STAR’s large acceptance facilitates jet reconstruction, allowing for a nearly fragmentation independent reconstruction of the partonic characteristics inside the proton. The inclusive jet double spin asymmetry ALL, ALL = 1

Extracting the Gluon Piece of the Spin Puzzle: New Inclusive Jet Results from STAR