Longitudinal double-spin asymmetry for inclusive jet production in p+p collisions at sqrt(s)=200 GeV

TL;DR

This paper presents a precise measurement of the double-spin asymmetry in inclusive jet production in polarized proton-proton collisions at 200 GeV, offering new insights into the gluon contribution to nucleon spin.

Contribution

It provides more precise data on A_LL for inclusive jets, significantly improving constraints on the gluon spin contribution compared to previous measurements.

Findings

More precise A_LL measurements over 5-30 GeV/c jet p_T range

Significant new constraints on gluon polarization in the nucleon

Comparison with global fits enhances understanding of nucleon spin structure

Abstract

We report a new STAR measurement of the longitudinal double-spin asymmetry A_LL for inclusive jet production at mid-rapidity in polarized p+p collisions at a center-of-mass energy of sqrt(s) = 200 GeV. The data, which cover jet transverse momenta 5 < p_T < 30 GeV/c, are substantially more precise than previous measurements. They provide significant new constraints on the gluon spin contribution to the nucleon spin through the comparison to predictions derived from one global fit of polarized deep-inelastic scattering measurements.