Gluon polarization measurements with inclusive jets at STAR

Understand

At RHIC kinematics, polarized jet hadroproduction is dominated by $gg$ and $qg$ scattering, making the jet double longitudinal spin asymmetry, $A_{LL}$, sensitive to gluon polarization in the nucleon.

• I will present STAR results of $A_{LL}$ from inclusive jet measurements for the RHIC 2006 run at center-of-mass energy 200 GeV.
• I will also discuss the current status of the analysis of data from the 2009 run, also at center-of-mass energy 200 GeV.
• The results are compared with theoretical calculations of $A_{LL}$ based on various models of the gluon density in the nucleon.