2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43229Two new showering routines are introduced, one for timelike final-state showers and one for spacelike initial-state ones. They are both based on emissions ordered in approximate transverse momenta that can easily be translated to virtualities. Matrix-element corrections can then be imposed as in the existing Pythia routines.LaTeX, 4 pages, submitted to the proceedings of the Workshop on Physics at TeV Colliders, Les Houches, France, 26 May - 6 June 2003High Energy Physics - Phenomenologytext