2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/104487I review recent theoretical developments and numerical results of twisted mass QCD. I argue that, combined with an efficient algorithm, twisted mass QCD can be an attractive QCD lattice action, to perform large scale simulations at small pion masses, where a matching with chiral perturbation theory can be performed. Open issues like flavour breaking effects are also addressed.Plenary talk given at the 23rd International Symposium on Lattice Field Theory, Dublin 25-30 July 2005, 22 pagesHigh Energy Physics - Latticetext