Evidence for polarization of gluons in the proton

Abstract

We discuss the impact of recent high-statistics RHIC data on the determination of the gluon polarization in the proton in the context of a global QCD analysis of polarized parton distributions. We find clear evidence for a non-vanishing polarization of gluons in the region of momentum fraction and at the scales mostly probed by the data. Although information from low momentum fractions is presently lacking, this finding is suggestive of a significant contribution of gluon spin to the proton spin, thereby limiting the amount of orbital angular momentum required to balance the proton spin budget.

5 pages, 5 eps figures

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• Parton distributions for the LHC
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• Global Analysis of Helicity Parton Densities and Their Uncertainties
• QCD Analysis of the Polarized World Data
• Determination of gluon polarization from deep inelastic scattering and collider data
• Semiinclusive DIS cross sections and spin asymmetries in the quantum statistical parton distributions approach

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