Addendum of the Letter of Intent for the upgrade of the ALICE experiment : The Muon Forward Tracker

The ALICE physics program after LS2 is mostly devoted to a high precision measurement of hard probes (heavy-flavour hadrons, quarkonia, photons and jets), with an upgrade of the central barrel detectors as reported in the Upgrade of the ALICE Experiment Letter of Intent (see external link below) and with the Muon Forward Tracker (MFT) described in the present addendum to the Letter of Intent. This will allow to study the properties of the QGP far beyond the capabilities of the present detector. We describe the physics program specific to the MFT, its expected physics gain with respect to the existing ALICE Muon Spectrometer and compared to other existing LHC approved programs, as well as its capabilities to extend the physics reach in the forward region of ALICE beyond muon physics. Technologically, the MFT project will take advantage of a synergy with the R&D program already ongoing for the ITS upgrade, as both detectors are foreseen to share the same CMOS sensor technology.