Measurements Of The Energy Dependence Of The Analyzing Power In Pp Elastic Scattering In The Cni Region

We present new measurements of the analyzing power A(N) in proton-proton elastic scattering in the Coulomb-Nuclear Interference region at root s=7.7 and 21.7 GeV obtained with the polarized atomic hydrogen jet target at RHIC. These measurements complement our earlier results at root s=6.8 and 13.7 GeV confirming the presence of a hadronic helicity flip amplitude contribution in proton-proton elastic scattering at lower energies (root s <8 GeV), while higher energy data (root s >13 GeV) are consistent with no hadronic helicity flip contribution.