New STAR double-spin asymmetry data for dijets at intermediate pseudorapidity favor positive gluon polarization and disfavor the JAM22 negative solution by 3.5 sigma.
Longitudinal double-spin asymmetry for inclusive jet production in p+p collisions at sqrt(s)=200 GeV
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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.
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Precision measurement of the longitudinal double-spin asymmetry for dijet production at intermediate pseudorapidity in polarized $pp$ collisions at $\sqrt{s}$ = 200 GeV
New STAR double-spin asymmetry data for dijets at intermediate pseudorapidity favor positive gluon polarization and disfavor the JAM22 negative solution by 3.5 sigma.