2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/110477A test of Lorentz invariance has been performed using an EIT resonance as a precision frequency discriminator within an Ives-Stilwell like apparatus. We analyse the experiment within the framework of the Standard Model Extension and have made the first direct measurment of the parameter $κ_{tr}<1.6\times10^{-5}$.11 pages, 3 figures Minor corrections: additional references and correction to calculated valueAtomic PhysicsHigh Energy Physics - Phenomenologytext