Longitudinal Double-Spin Asymmetry and Cross-Section Measurement for Inclusive Jets at √ {S}=200\ GEV in Polarized PP Collisions

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Scientific paper

We present the STAR 2005 preliminary inclusive jet longitudinal double-spin asymmetry for polarized protons collisions with √ {s} = 200\ GeV. Comparison of these measurements with theoretical calculations based on deep inelastic scattering (DIS) results show that the 2005 asymmetry measurement provides significant new constraints on the gluon contribution to the proton's spin. We also present the 2003/2004 inclusive jet cross-section. Interpretation of this asymmetry within the next-to-leading order (NLO) perturbative Quantum Chromodynamics (pQCD) framework is motivated by the agreement between the 2003/2004 inclusive jet cross-section and theory over seven orders of magnitude.

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