  The PP2PP experiment is devoted to the proton-proton elastic scattering
measurement at the Relativistic Heavy Ion Collider at the centre-of-mass
energies between 50 and 500 GeV and the four-momentum transfer $0.0004 \leq |t|
\leq 1.3$ Gev$^2$. The option of polarized proton beams offers a unique
possibility to investigate the spin dependence of the proton elastic scattering
in a systematic way. The energy dependence of the total and elastic cross
section, the ratio of the real to the imaginary part of the forward scattering
amplitude, and the nuclear slope parameter will be studied. In the medium $|t|$
region ($|t| \leq 1.3$ Gev$^2$) the energy dependence of the dip structure in
the elastic differential cross section will be measured. With polarized beams
the measurement of spin dependent observables: the difference of the total
cross sections as function of the of initial transverse spin states, the
analyzing power and the double spin asymmetries will be used to map the $s$ and
$t$ dependence of the proton helicity amplitudes.
