CMS has just finished wrapping the barrel with a new layer which is not a new detector but a brand new protection system aimed to keep the outer barrel muon chambers shielded from background radiation present in the experimental cavern during…
The DT upgrade pages has been updated to include new links to many items such as meetings, documents, results and so on.
See: https://cmsexperiment.web.cern.ch/org/dt-upgrades
-- Cristina Fernández Bedoya