This document contains some initial input from INFN to the update of the European Strategy for Particle Physics. It does not aim at providing a comprehensive overview of the INFN position on all the relevant aspects of the Strategy: this will be defined with the other actors all along the update process, from the Open Symposium of May 2019 to the Strategy Drafting Session of January 2020. It aims instead at emphasizing the INFN position on three key issues that according to INFN deserve special attention:
• An ambitious post-LHC accelerator project at CERN
• The relation between CERN and AstroParticle Physics
• The CERN laboratory and the laboratories in the Member States
The content of this document takes into account the information presented and the extensive discussions held at a National INFN “Town Meeting”, which took place in Rome on 6-7 September 2018: https://agenda.infn.it/conferenceOtherViews.py?view=standard&confId=15968
Independent and more detailed input is being submitted by some of the National INFN Scientific Committees and Laboratories, in particular CSN1 (Particle Physics), CSN2 (AstroParticle Physics), CSN3 (Hadronic Physics), C3S (Physics and Computing) and LNF (Frascati).