Abstract
One of the main objectives of the high-energy spin physics program at RHIC at BNL is the precise determination of the polarized gluon distribution function, Δg(x). Polarized [Formula: see text] collisions at [Formula: see text] GeV and at [Formula: see text] GeV at RHIC provide an unique way to probe the proton spin structure. Inclusive measurements, such as inclusive jet and hadron production, have so far been the prime focus of various results at [Formula: see text] GeV constraining Δg(x) for 0.05 < x < 0.2. A recent global analysis provides for the first time evidence of a non-zero value of the gluon polarization [Formula: see text]. First results of di-jet production at [Formula: see text] GeV by the STAR collaboration will allow a better constraint of the underlying event kinematics. Extending the current program to smaller values of x is a key goal for the future high-energy spin physics program at RHIC. Forward di-jet production measurements at STAR beyond the current acceptance from -1 < η < +2 to +2.5 < η < +4, in particular those carried out at [Formula: see text] GeV, provides access to low x values at the level of 10-3 where current uncertainties of Δg(x) remain very large. Those measurements will eventually be complemented by a future Electron-Ion Collider facility probing Δg(x) in polarized [Formula: see text] collisions.
Highlights
IntroductionThe gluon polarization program by the STAR
High energy polarized p + p collisions at a center-of-mass energy of s = 200 GeV and at s = 500 GeV at RHIC at BNL provide an unique way to probe the proton spin structure using very well established processes in high-energy physics, both experimentally and theoretically
The measurement of the gluon polarization at RHIC has been formulated as a key milestone of the US Nuclear Physics program
Summary
The gluon polarization program by the STAR This is an Open Access article published by World Scientific Publishing Company. Cant result of inclusive jet production at s = 200 GeV is based on data collected during the 2009 running period (Run 9) [8]. This result is dominating the impact on the gluon polarization extracted in a recent updated global analysis.. The asymmetry measurement for inclusive jet production and di-jet production are clearly pointing towards a larger gluon polarization compared to the first global analysis which included results form the Run 2005/2006 RHIC polarized p + p running periods of inclusive jet and hadron production. Future measurements require additional means to provide a direct sensitivity to the actual x dependence of ∆g(x)
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