2017/08/29 by D. Olvitt, Olvitt, Daniel L.
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Superconducting Materials and Applications
paper · pdf · doi:10.48550/arxiv.1708.08882
openalex publication_date 2017/08/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The production of jets from polarized proton+proton collisions at STAR is dominated by quark-gluon and gluon-gluon scattering. The dijet double spin asymmetry (A\tsubLL) is sensitive to the polarized gluon distribution (Δg(x)). Dijets are also advantageous because the parton momentum fraction, x, of initial partons may be reconstructed to first order from the final state measurements. Both jet and dijet A\tsubLL measurements at √(s) = 200 GeV have helped to constrain Δg(x) in the range 0.05 < x < 0.3. In 2012, data were collected at √(s) = 510 GeV in order to probe lower values of x, these data are consistent with the √(s) = 200 GeV results in the overlapping xT region. Jet and dijet preliminary A\tsubLL results have been released and will soon be incorporated into global analyses. In 2013, high luminosity data, with an estimated 250 pb-1 of integrated luminosity were collected at √(s) = 510 GeV. These data have a figure of merit of ∼3 times that of the 2012 data. An update on the dijet A\tsubLL measurement will be presented using polarized p+p data collected at STAR during 2013.