Event reconstruction in p-p collisions at high luminosity (HL-LHC, HE-LHC and FCC-hh with a pile-up of 200 and more) or in a high multiplicity heavy ion environment suffers substantially from increased event complexity

The foreseen vertex density often hinders the separation between particles stemming from the primary hard-scatter vertex and pile-up vertices when using current algorithms. In addition, calorimeters have to adopt a high granularity design in order to withstand the harsh radiation levels and disentangle the signal event from the very large pile-up background.

Objectives of this R&D line include both advances in reconstruction software to exploit modern parallel hardware, as well as the adaptation to new detector concepts that are particularly designed for the high particle multiplicity.