Flavour Physics at the High Luminosity LHC: LHCb Upgrade II

The LHCb Collaboration is planning an Upgrade II, a flavour physics experiment for the high luminosity era. This will be installed in LS4 (2030) and targets an instantaneous luminosity of 1.5 x10^34 cm-2 s-1, and an integrated luminosity of at least 300fb-1. The project thus lies intermediate in time, but also in many specifications, between ATLAS/CMS upgrade II and projects for future accelerators. Modest consolidation of the current experiment will also be introduced in LS3 (2025). Physics goals include probing new physics scenarios in lepton flavour universality, obtaining unprecedented precision on CKM tests, and expanding the LHCb programme into new measurement areas such as Higgs decays to charm. The detector design options include the introduction of timing information, with opportunities in "4D" vertexing and tracking, "5D" electromagnetic calorimetry, and hadron particle identification in both RICH systems and time of slight systems. A large scale tracking system based on hybrid modules of CMOS silicon and scintillating fibres is proposed. Preliminary studies from the LHC machine suggest that the luminosity goals will be achievable. Following the issue of an expression of interest in 2017, and a physics case and accelerator note in 2018, the collaboration has been approved by the LHCC to proceed to the preparation of a Framework TDR. This presentation will present the status of this new project highlighting the opportunities for detector R&D in the next years.