2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45870It is shown that if antiparticles are realized in quantum field theory by negative frequency states, which nevertheless have positive energy density, the resulting theory provides a qualitative explanation for the experiments on the neutral K mesons, without assumming any symmetry violation.Standard LaTeX article, 7 ppHigh Energy Physics - Phenomenologytext