Abstract
The future of diffraction program at the Relativistic Heavy Ion Collider (RHIC) is discussed. Most of the program is associated with an approved experiment Total and Differential Cross Sections and Polarization Effects in pp Elastic Scattering at RHIC, PP2PP experiment. In the medium | t| range, diffractive region, with four momenta transferred 0.006 < | t| < 1.3 (GeV/ c) 2, the experiment will address one of the main, unsolved problems in particle and nuclear physics: long-range QCD and confinement. In the small | t| range, Coulomb Nuclear Interference (CNI), 0.0004 < | t| < 0.12 (GeV/ c) 2, the experiment will, in a model-independent way, test general analytical properties of scattering amplitudes: analyticity, unitarity, and crossing symmetry. In addition, by measuring single spin asymmetries such as A N , double spin correlation parameter A NN , and cross section difference Δσ T = σ tot (↑,↓) − σ tot (↑,↑), we will be able to determine the helicity amplitudes φ i . Those amplitudes are not well known now, so their systematic study at RHIC will help to understand the spin structure of the nucleon and of the exchanged mediators of the force, Pomeron and Odderon.
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