The CMS experiment has performed a new search for Charge-Parity violation in Higgs boson decays to tau leptons, shedding light on the origin of matter. Since its discovery in 2012, the Higgs boson has helped scientists explore some of the Universe’…

  For the first time, the CMS experiment probes quantum entanglement in Higgs boson decays to a pair of Z bosons. The result is the most general analysis of kinematic distributions in the four-lepton final state, measuring spin correlations and…

  In Run 3, CMS expanded its trigger program to enhance capturing long-lived particles that decay far away from the point of collision – broadening the search for physics beyond the Standard Model. Imagine a high-security vault. Most intruders…

For the first time ever, the CMS experiment has designed a dedicated analysis using parametrised machine learning to look for new dark particles that don’t socialize with Standard Model fermions, one of them being a favourite candidate in the…

  The CMS Collaboration reports the first measurements of the production of same-sign WW and WZ boson pairs in association with two jets at 13.6 TeV, using data collected during 2022–2024. One of the most powerful probes of the Higgs mechanism…

  The CMS Collaboration announces 38 new results for Moriond 2026. Here are the highlights of what we have presented so far. CMS reports an independent confirmation of the observed excess of top quark pair events at the production threshold (…

The Electromagnetic Calorimeter (ECAL) group has tested the second enfourneur (pictured above), a highly specialized instrument that allows the insertion and extraction of key components of the CMS detector at CERN, the ECAL ‘supermodules’. Weighing…

CMS successfully carried out key tests for the lifting system needed in the construction of Hi Lumi CMS during the end of year stop 2025/2026. Four thin legs emerge from the floor of the CMS cavern to lift incredibly heavy parts of the CMS detector…

The CMS Collaboration reports the first measurement of coherent ϕ meson photoproduction, establishing a powerful new tool to explore the dense nuclear matter in the transition regime from perturbative to nonperturbative QCD. The CMS Collaboration…

Anadi Canepa has been elected the new CMS Spokesperson 2026 - 2028. Florencia Canelli will join Hafeez Hoorani as Deputy Spokesperson.  With more than 6000 scientists, engineers, technicians, administrators and students, CMS is one of the world…

An interactive version of the above event display can be found at this page. For the first time, the CMS experiment has demonstrated that machine learning can be used to reconstruct collisions at the LHC. This new approach improves the precision…

After an eight-week journey, the first HGCAL absorber structure (CE-H1) was delivered to CERN and is ready to be assembled, just 100 metres above where the detector will eventually be located. Seventeen enormous boxes were delivered at the CMS…