Abstract
We report a new measurement of the midrapidity inclusive jet longitudinal double-spin asymmetry, , in polarized collisions at center-of-mass energy . The STAR data place stringent constraints on polarized parton distribution functions extracted at next-to-leading order from global analyses of inclusive deep-inelastic scattering (DIS), semi-inclusive DIS, and RHIC data. The measured asymmetries provide evidence at the level for positive gluon polarization in the Bjorken- region .
- Received 20 May 2014
DOI:https://doi.org/10.1103/PhysRevLett.115.092002
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