Longitudinal double spin asymmetry in jet production at STAR

Abstract

We present recent measurements of the longitudinal double-spin asymmetry A_LL for the inclusive production of jets at midrapidity in polarized proton-proton collisions at sqrt(s)=200GeV. The data amount to an integrated luminosity of 3pb-1 and were collected with the STAR detector at the Relativistic Heavy Ion Collider during the year 2005 with average beam polarizations of about 50%. The ALL measurements cover jet transverse momenta 5 < pT < 30 GeV/c expanding the pT coverage over previously published data. The results will be compared with perturbative QCD evaluations and shown to provide sensitive constraints on the gluon spin contribution to the nucleon spin.

arXiv comment4 pages, 1 figure

References in corpus (4)

• Inclusive cross section and double helicity asymmetry for π^0 production in p+p collisions at sqrt(s)=200 GeV: Implications for the polarized gluon distribution in the proton
• Run II Jet Physics: Proceedings of the Run II QCD and Weak Boson Physics Workshop
• Local Polarimetry for Proton Beams with the STAR Beam Beam Counters
• Measurement of the Analyzing Power $A_N$ in $pp$ Elastic Scattering in the CNI Region with a Polarized Atomic Hydrogen Gas Jet Target

Cited by in corpus (1)

• The role of the quark and gluon GPDs in hard vector-meson electroproduction