%0 Journal Article
%T Impact picture for the analyzing power $A_N$ in very forward $pp$ elastic scattering
%A Bourrely
%A Claude
%A Soffer
%A Jacques
%A Wu
%A Tai Tsun
%J High Energy Physics - Phenomenology
%D 2007
%I 
%R 10.1103/PhysRevD.76.053002
%X In the framework of the impact picture we compute the analyzing power $A_N$ for $pp$ elastic scattering at high energy and in the very forward direction. We consider the full set of Coulomb amplitudes and show that the interference between the hadronic non-flip amplitude and the single-flip Coulomb amplitude is sufficient to obtain a good agreement with the present experimental data. This leads us to conclude that the single-flip hadronic amplitude is small in this low momentum transfer region and it strongly suggests that this process can be used as an absolute polarimeter at the BNL-RHIC $pp$ collider.
%U http://arxiv.org/abs/0707.2222