Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2008-10-17
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 5 figures, Proceedings of the 34th International Conference on High-Energy Physics (ICHEP 08), Philadelphia, USA, Jul
Scientific paper
The main focus of the physics program at PHENIX and STAR that makes use of RHIC's polarized proton beams is to figure out how and if at all the gluons inside protons are polarized, or to put it another way, do the spin 1 gluons prefer to have their spins aligned or anti-aligned with the spin of the proton, or do they just not care? This question is an important part of the more general question of how the constituents of protons, gluons and quarks, conspire to make up the overall spin 1/2 of the proton. Measurements of, e.g, jet and hadron, production cross-section differences between the two cases where the two polarized protons colliding have their spins aligned and anti-aligned are sensitive to the gluon polarization, which is encoded in the spin--dependent parton distribution function (PDF) for gluons, Delta-g(x).
Ellinghaus Frank
PHENIX for the
STAR Collaborations
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