Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.012001
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Funding
- U.S. DOE [DE-AC02-98CH10886]
- BNL-LDRD Project [12-034]
- CONICET
- ANPCyT
- UBACyT
- Marie Curie [IRG 256574]
- Institutional Strategy of the University of Tubingen (DFG) [ZUK 63]
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We discuss the impact of recent high-statistics Relativistic Heavy Ion Collider 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 evidence for a nonvanishing 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.
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