This document is sent on behalf of the academic faculty members and researchers of the High Energy Physics (HEP) Groups at Universidad de Buenos Aires (UBA-CONICET) and Universidad Nacional de La Plata (UNLP-CONICET). The main goal of these HEP groups is the search for new physics by a synergy of theoretical exploration and experimental innovation in the framework of the ATLAS experiment at the Large Hadron Collider (LHC) in the current phase, and in the approved High Luminosity Large Hadron Collider (HL-LHC), as well as in experiments of future colliders in the field.