The paper “Becchi-Rouet-Stora-Tyutin-Lagrangian double copy of Yang-Mills theory“, co-authored by Leron Borsten (Heriot-Watt), Jurčo Branislav (Charles U, Prague), Hyungrok Kim (Heriot-Watt), Tommaso Macrelli, Christian Saemann (Heriot-Watt), and Martin Wolf, has been published this week (12 May) in Physical Review Letters. The paper is published gold open access and is available here. The following two diagrams concisely summarize the theory’s field content from the perspective of the double copy, describing the symmetrized and antisymmetrized tensor products of two copies of the BRST Yang-Mills fields: