Longitudinal Double Spin Asymmetry in Inclusive Jet Production at STAR

الأصل · EN

This contribution reports on the first measurement of the longitudinal double-spin asymmetry ALL for the inclusive production of jets in polarized proton-proton collisions at √s=200 GeV. The data were collected with STAR at RHIC in the years 2003 and 2004, and correspond to a sampled integrated luminosity of 0.3 pb⁻¹ with beam polarizations up to 45%. The results on ALL cover jet transverse momenta 5 < pₜ < 17 GeV/c and agree with perturbative QCD evaluations based on deep-inelastic scattering parametrizations for the gluon polarization in the proton. The results disfavor large positive gluon polarization in the polarized proton.