A special test run, with more than twice as many near-simultaneous collisions as usual, allowed CMS to test new methods of tracking and identifying particles, years before the upgraded High-Luminosity LHC comes online. For a few days during 20…

Using Z bosons, the CMS experiment reveals new details of how the Quark-Gluon Plasma drains energy from energetic quarks and challenges current theoretical descriptions. To understand the Quark-Gluon Plasma (QGP), the hottest matter in the Universe…

  The CMS Collaboration announces 28 new results for ICHEP 2026. Among the highlights are three new results including 2026 data, and several brand new searches. The CMS Collaboration is presenting a broad portfolio of new physics results at the…