Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at s =200 GeV

(STAR Collaboration)

Research output: Contribution to journalArticlepeer-review

Abstract

We report high-precision measurements of the longitudinal double-spin asymmetry, ALL, for midrapidity inclusive jet and dijet production in polarized pp collisions at a center-of-mass energy of s=200 GeV. The new inclusive jet data are sensitive to the gluon helicity distribution, Δg(x,Q2), for gluon momentum fractions in the range from x≃0.05 to x≃0.5, while the new dijet data provide further constraints on the x dependence of Δg(x,Q2). The results are in good agreement with previous measurements at s=200 GeV and with recent theoretical evaluations of prior world data. Our new results have better precision and thus strengthen the evidence that Δg(x,Q2) is positive for x>0.05.

Original languageEnglish (US)
Article numberL091103
JournalPhysical Review D
Volume103
Issue number9
DOIs
StatePublished - May 1 2021

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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