Longitudinal double-spin asymmetry for inclusive jet production in p+p collisions at s**(1/2) = 200-GeV
Phys.Rev.Lett. 100 (2008) 232003, 2008.
The collaboration

Abstract (data abstract)
We report a new STAR measurement of the longitudinal double-spin asymmetry $A_{LL}$ for inclusive jet production at mid-rapidity in polarized p+p collisions at a center-of-mass energy of $\sqrt{s}$ = 200 GeV. The data, which cover jet transverse momenta $5 < p_{T} < 30$ GeV/c, are substantially more precise than previous measurements. They provide significant new constraints on the gluon spin contribution to the nucleon spin through the comparison to predictions derived from one global fit of polarized deep-inelastic scattering measurements.