Nucleon Spin Structure Physics at PHENIX

Details Nucleon Spin Structure Physics at PHENIX Nucleon Spin Structure Physics at PHENIX

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..dnp.1wa05l&link_type=abstract

Geophysical Research Letters, v. 24, No. 17, p. 2115 (1997).

Physics

2459 Ionosphere, Planetary Ionospheres (5435, 5729, 6026, 6027, 6028), 2756 Magnetospheric Physics, Planetary Magnetospheres (5443, 5737, 6030), 5729 Planetology: Fluid Planets, Ionospheres (2459)

Scientific paper

The PHENIX Experiment on the Relativistic Heavy Ion Collider at Brookhaven National Laboratory will search not only for a new phase of matter at extremely high energy density via collisions of gold nuclei, but also for new knowledge at the heart of the continuing puzzle that is the spin structure of the nucleon. Beams of polarized protons, colliding at √s = 200 and 500 GeV, will provide an environment of hard scattering between gluons and quarks complementary to that provided by deep inelastic scattering of leptons and nucleons. Proton--proton collisions can directly probe the polarized gluon and anti--quark distributions because the collisions couple the color charges of the participants, whereas the more selective leptonic deep inelastic scattering process primarily only involves the electric charges. In the first years of operation of RHIC, with possibly limited luminosity, PHENIX can study these distributions via J/ψ and high--pT π^0 production. In later years, with the full luminosity of 2×10^32 cm-2s-1, flavor--separated quark and anti--quark spin structure functions can be measured using the parity--violating flavor--dependent production of W^+ and W^- bosons detected via leptonic decay, whereas the polarized gluon distribution can be directly observed from high--pT photons produced in ``gluon--Compton'' scattering.

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