CMS Experiment CERN

🧐Could the universe be hiding more particles like the Higgs boson? CMS performs a first search for the decay of the Higgs boson into two more Higgs-boson-like particles with unequal masses. Read in our physics briefing more: cms.cern/news/search-ne…

➰Through the quantum loop! CMS examines rare decays of the Higgs boson into a Z boson and a photon 👉 Read more in our briefing: cms.cern/news/out-loop-…

🧐The curious case of quarkonia inside jets. In a first study by CMS, ϒ mesons – bound states of a bottom quark and antiquark – produced inside jets are defying expectations, revealing cracks in our theoretical models. Read our briefing here: cms.cern/news/curious-c…

🔎From discovery to precision📐: CMS studies the Higgs boson in its cleanest, "golden" channel, using four-lepton events from 2022–2024, reporting production rates as a function of several variables. Read more in our briefing: cms.cern/news/discovery…

Protons are made of quarks – but are quarks the end of the story? 🧐 For the first time, CMS zooms in to 10⁻²⁰ m to find out! Read more on our briefing: cms.cern/news/whats-ins…

DESY lead scientist, a CMS communications leader, and University of Hamburg professor invited into prestigious Dutch national academy based on her research and science communication work. Read the full article on our website: cms.cern/news/cms-scien…

✨How bright is the heaviest matter of the universe? ✨CMS has carried out the first simultaneous measurement of solo and duet production of top quarks together with particles of light. Read more: cms.cern/news/testing-h…

The CMS experiment at CERN is building a new detector that will unravel the chaotic particle collisions at the Large Hadron Collider, helping scientists identify particles based on their speeds. news.fnal.gov/2026/03/new-ul…

Weighing the Higgs boson using flashes of light! 🎇 CMS provides an accurate measurement of the mass of the Higgs boson by studying its decay into two photons. Read more in our briefing 👉 cms.cern/news/cms-weigh…

🔎A rare sighting at CMS! For the first time, CMS observes elusive production of two Z bosons together with two jets, completing our picture of scattering between heavy force-carrying particles Read more in our briefings 👉 cms.cern/news/cms-obser…

📖A new chapter in the toponium story! 🤩 CMS provides another indication of the momentary union of a top quark and antiquark, this time in events containing only one lepton. Read more about this exciting story in our briefing 👉 cms.cern/news/cms-obser…

🧐Is the Higgs boson decaying oddly? The CMS Collaboration has measured the geometry of Higgs boson decays into pairs of tau leptons to check for signs of matter and antimatter behaving differently Read more in our briefing 👉 cms.cern/news/does-higg…

🪢Quantum entanglement in Higgs boson decays! For the first time, the CMS experiment probes entanglement in the H → ZZ process, measuring spin correlations and providing a complete Effective Field Theory picture. Read the briefing here 👉 cms.cern/news/tangled-d…

💃🕺What if you could express your research through Dance? Enter into the world of a CMS PhD through music and movement to explore some of the most complex areas of physics ✨See CMSer Maryam Shooshtari's piece, entered for the Dance Your PhD 2026! youtube.com/watch?v=SNElUG…

Triggering off the beaten path – CMS expands the hunt for long-lived particles that decay far from the point of collision 📍💥 Read more: cms.cern/news/unlocking…

🚀Prepare for trouble! Make it double! Is there a new type of symmetry out there that prevents new dark particles from socializing with the known standard model particles? Read more 👉 cms.cern/news/double-do…

Heavy force-carriers collide at record energy ⚡ CMS reports the first measurements of vector boson scattering at 13.6 TeV. Read more 👉 cms.cern/news/first-mea…

How did Korea become part of the CMS Collaboration? 🇰🇷 Sung Park, the driving force behind Korea CMS, discusses the project's early days, the hurdles the team overcame, and the incredible milestones they’ve reached! 🎯 Watch the video: youtu.be/yL9VphwZk64?si…

Join us for all the latest news about the Moriond physics conference! 👉cms.cern/news/cms-morio… You can find a summary of CMS' contributions here, and it will be updated throughout the next two weeks as more results are announced so make sure to stay tuned!

CMS successfully tested the HiLumi CMS lifting system during the 2025/2026 year-end stop, and we captured the whole process in this timelapse! 🏗️ 🗞️Read the news here: cms.cern/news/load-test…