Gluon polarization measurements with inclusive jets at STAR

Abstract

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. The STAR data place significant constraints on allowed theoretical models.

4 pages, 5 figures, XIX International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS 2011)

References in corpus (3)

• PYTHIA 6.3 Physics and Manual
• Run II Jet Physics: Proceedings of the Run II QCD and Weak Boson Physics Workshop
• Measurement of the Analyzing Power $A_N$ in $pp$ Elastic Scattering in the CNI Region with a Polarized Atomic Hydrogen Gas Jet Target

Cited by in corpus (2)

• The Spin Structure of the Nucleon
• Longitudinally Polarized Photoproduction of Heavy Flavors at Next-to-Leading Order of QCD