The Preparatory Group was established with the main purpose of preparing the guidelines and receiving white papers from the different efforts in High Energy Physics, AstroParticles and Cosmology in the region. The white papers  are the basis for mapping a landscape of initiatives in the region. The Preparatory Group is also in charge of organizing Workshops  to discuss the contributions and to prepare the Physics Briefing Book for the Strategy Group.

The initial members of the  Preparatory Group were nominated by the countries representatives in the SILAFAE International Scientific Committee.
 
  • Members of the Preparatory Group (2021-2023) – extended until November 2024
Argentina: Diana López Nacir (co-chair),  Federico Sanchez, Hernán Wahlberg
Bolivia: Martin Alfonso Subieta Vasquez
Brasil: Ignácio Bediaga, Jailson Alcaniz, Rogerio Rosenfeld (chair)
Chile: Alfonso Zerwekh, Mauro Cambiaso
Colombia: Nicolás Bernal, José David Ruiz Álvarez, Marta Losada (United Emirates/ex-oficio)
Ecuador: Dennis Cazar Ramírez, Harold Yepes Ramírez
Guatemala: María Eugenia Cabrera
Honduras: Melissa  Cruz Torres
Costa Rica: Federico Muñoz
Mexico: Alfredo Aranda, Juan Carlos D’Olivo, Gerardo Herrera Corral
Paraguay: Jorge Molina
Peru: Alberto Gago
Venezuela: Reina Camacho (France), José Antonio López, Arturo Sánchez (France)
USA: Marcela Carena (Fermilab), Francisco Yumiceva (CMS)
Switzerland: Martijn Mulders (CERN)
 
  • Members of the Preparatory Group (2018-2020)
Argentina: Diana López Nacir,  Federico Sanchez, Hernán Wahlberg
Bolivia: Martin Alfonso Subieta Vasquez
Brasil: Leandro de Paula (observer), Thiago S. Gonçalves (co-chair), Rogerio Rosenfeld
Chile: Alfonso Zerwekh, Mauro Cambiaso
Colombia: Marta Losada (chair), Diego Restrepo
Ecuador: Lofti Boubekeur, Harold Yepes Ramírez, Edgar Carrera
Mexico: Alfredo Aranda, Juan Carlos D’Olivo, Gerardo Herrera Corral
Paraguay: Jorge Molina
Peru: Alberto Gago
Venezuela: Reina Camacho, Arturo Sánchez
USA: Marcela Carena (Fermilab), Marcelle Soares-Santos (Brandeis U.)
Europe: Martijn Mulders (CERN)
Asia: Hiroaki Aihara (U. Tokyo)