2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/182815Parity-odd asymmetries in the decay angular distribution of a W boson produced with a hard jet in p\bar{p} collisions arise only from QCD rescattering effects. If observed, these asymmetries will provide a first demonstration that perturbative QCD calculation is valid for the absorptive part of scattering amplitudes. We propose a simple observable to measure these asymmetries and perform realistic Monte Carlo simulations at Tevatron energies. It is shown that the Tevatron Run-II should provide sufficient statistics to test the prediction.4pages, 2figures, revtex, references and discussions added, version to appear in PRL, typo correctedHigh Energy Physics - Phenomenologytext