Longitudinal double-spin asymmetry for inclusive jet and dijet production in pp collisions at √(s) = 510 GeV

2019/06/06 by STAR Collaboration, J. Adam, L. Adamczyk +343 · 1 citation
Physics and Astronomy · #hep-ex #nucl-ex

paper · pdf · doi:10.1103/physrevd.100.052005

published as Phys. Rev. D 100, 052005 (2019)

arxiv created 2019/06/06 · arxiv updated 2019/09/18

Abstract

We report the first measurement of the inclusive jet and the dijet longitudinal double-spin asymmetries, A_LL, at midrapidity in polarized pp collisions at a center-of-mass energy √(s) = 510 GeV. The inclusive jet A_LL measurement is sensitive to the gluon helicity distribution down to a gluon momentum fraction of x≈ 0.015, while the dijet measurements, separated into four jet-pair topologies, provide constraints on the x dependence of the gluon polarization. Both results are consistent with previous measurements made at √(s)= 200 GeV in the overlapping kinematic region, x > 0.05, and show good agreement with predictions from recent next-to-leading order global analyses.

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