Document Type

Article

Publication Date

2015

DOI

10.1103/PhysRevLett.115.092002

Publication Title

Physical Review Letters

Volume

115

Issue

9

Pages

092002 (1-7)

Abstract

We report a new measurement of the midrapidity inclusive jet longitudinal double-spin asymmetry, ALL, in polarized pp collisions at center-of-mass energy √s = 200 GeV. 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 pp data. The measured asymmetries provide evidence at the 3σ level for positive gluon polarization in the Bjorken-x region x > 0.05.

Comments

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Original Publication Citation

Adamczyk, L., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Ahammed, Z., Alekseev, I., . . . Collaboration, S. (2015). Precision measurement of the longitudinal double-spin asymmetry for inclusive jet production in polarized proton collisions at √s=200 GeV. Physical Review Letters, 115(9), 092002. doi:10.1103/PhysRevLett.115.092002

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