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Spin Physics at RHIC 4

JPS Meeting, Matsue

Experimental Spin Asymmetries

Photo absorption:

Does not conserve

angular momentum

Proton and photon spin parallel: Quarks

Quarks with spin anti-parallel contribute

Proton and photon spin antiparallel:

Quarks with spin parallel contribute

Measure Double

Spin Asymmetry

Cross Section:

Virtual photon Asymmetry

Proton

Probe:

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