New ALICE detectors for Run 3 and 4 at the CERN LHC

Abstract

Run 3 at the CERN LHC is scheduled to start in March 2021. In preparation for this new data taking period the ALICE experiment is making major modifications to its subsystems and is introducing three new detectors: the new Inner Tracking System, the Muon Forward Tracker, and the Fast Interaction Trigger. The new detectors will enhance tracking, especially at low transverse momenta, improve vertexing, provide the required triggering, fast timing, luminosity, and forward multiplicity functionality. For instance, it will be possible to measure beauty from displaced J/ψ vertices down to transverse momenta pT ∼ 0 and improve precision for the ψ(2S) measurements. The upgraded ALICE will be able to register ten-fold increase of Pb-Pb delivered luminosity in Run 3 and 4 as well as two orders of magnitude more minimum bias events at 50 kHz in Pb-Pb collisions.