  For the first time the scientific community in Latin America working at the
forefront of research in high energy, cosmology and astroparticle physics
(HECAP) have come together to discuss and provide scientific input towards the
development of a regional strategy.
  The present document, the Latin American HECAP Physics Briefing Book, is the
result of this ambitious bottom-up effort. This report contains the work
performed by the Preparatory Group to synthesize the main contributions and
discussions for each of the topical working groups. This briefing book
discusses the relevant emerging projects developing in the region and considers
potentially impactful future initiatives and participation of the Latin
American HECAP community in international flagship projects to provide the
essential input for the creation of a long-term HECAP strategy in the region.
