CMS observes the η meson decaying into two muons and two charged pions for the first time. Over the past three years, the CMS experiment has steadily expanded our view of the eta (η) meson's rarest decays. Following the first observations of the η me…

  The CMS Collaboration announces several new results for the Higgs 2026 conference. The CMS Collaboration presents a broad spectrum of new results at the Higgs 2026 conference in Louvain, Belgium. These cover precision measurements of the Higgs…

The CMS Collaboration congratulates the winners of the 2025 CMS PhD Thesis Award: Carlos Vico Villalba, Laurids Jeppe, and Elena Vernazza.  The award celebrates outstanding theses from the CMS collaboration that have a significant impact on…