  We present preliminary results for the first measurements of the double
longitudinal spin asymmetry A_LL in inclusive jet production at mid-rapidity in
polarized proton-proton collisions at sqrt(s) = 200 GeV. The data amount to ~
0.5 pb-1 collected at RHIC in 2003 and 2004 with beam polarizations up to 45%.
The jet transverse energies are in the range of 5 < pT < 17 GeV/c. The data are
consistent with theoretical evaluations using deep-inelastic scattering
parametrizations for gluon polarization in the nucleon, and tend to disfavor
large positive values of gluon polarization.
