2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/178815The recent measurement of atomic parity violation in cesium atoms shows a $2.3σ$ deviation from the standard model prediction. We show that such an effect can be explained by four-fermion contact interactions with specific chiralities or by scalar leptoquarks which couple to the left-handed quarks. For a coupling of electromagnetic strength, the leptoquark mass is inferred to be 1.1 to 1.3 TeV. We also show that these solutions are consistent with all other low-energy and high-energy neutral-current data.published version, some discussions addedHigh Energy Physics - PhenomenologyHigh Energy Physics - Experimenttext