2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46622Using two hopefully reasonable assumptions plus existing data on the analyzing power in high energy proton-proton elastic scattering, we estimate that the hadronic helicity-flip amplitude at $P^2_{\perp}$ of 0.003 (GeV/c)$^2$ is neglible near 300 GeV. This would allow the absolute calibration of a CNI polarimeter.4 pages, latex, no figures, talk given at Workshop on High Energy Polarimeters, Amsterdam, September 9, 1996High Energy Physics - Phenomenologytext