June 29, 2026 saw the end of the LHC Run 3, and the end of the LHC as we know it! The next time CMS records particle collisions, it will be in 2030, provided by the High-Luminosity LHC (HL-LHC), and from a very different detector to what we have today.
For CMS, Run 3 was a real success, with more collision data than ever before (355/fb) delivered to the experiment, with a recording efficiency of 92%. While many results with Run 3 data have already been published, this data will continue to be studied and analysed by CMS physicists over the coming years.
The Phase-1 barrel pixel detector built at PSI has shown a good performance over the entire Run 3 and will be extracted in fall 2026.
