CMS probes the highest-energy lepton pairs ever recorded to search for hints pointing to a Higgs boson made of smaller constituents. Is the Higgs boson truly an elementary particle, or could it be composed of more fundamental constituents? This ques…

  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…