**EXTRAORDINARIO** (notar día, lugar y hora). Fast Timing Detector R&D for the HL-LHC era

There is a growing interest in applying timing measurement of physics objects
(leptons, jets, photons) in the high pileup environment planned for the next
decade at the LHC. Time of occurrence of events within the same bunch
(“in-time pileup”) can be used analogously to the more commonly used “event
vertex position” tagging to resolve events of interest in this busy
environment. Extending to this 2-D tool (time and space discrimination) is
likely key to enabling the challenging measurements of the next decade by
suppressing pileup background. In this seminar I will describe progress on
fast sensors (Si and MPGD) we are developing in a collaboration of CERN,
Princeton, Saclay- partly within an RD51 common project framework.