2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40509We argue that diffraction (Pomeron) contribution is present in the pp spin-flip amplitude. RHIC polarization will be able to prove (or disprove) this conjecture.11 pages, 11 Encapsulated Postscript files, LaTeX2e used. Submitted to The European Physical Journal C - Particles and FieldsHigh Energy Physics - Phenomenologytext