A rare double act: CMS publishes its first search for Higgs boson pair production with two charged leptons and two bottom quarks in the final state using data collected at a centre-of-mass energy of 13.6 TeV, improving the sensitivity of the search.

🔗 cms.cern/news/chasing-h…

‌Congratulations to the three recipients of the 2025 CMS PhD Thesis Award, Laurids Jeppe, Elena Vernazza and Carlos Vico Villalba!

🎙️ Hear from them as they reflect on the challenges that shaped their PhDs at CMS: youtu.be/p8gq0sgIHGI
‌
📖 cms.cern/news/cms-phd-t…

How much does the Higgs boson weigh?
Combining measurements from two decay channels, the CMS experiment has determined the most precise measurement of the mass achieved by a single experiment to date.

🔗 Read more: cms.cern/news/how-much-…

After a decade at the heart of particle physics, the CMS Pixel Detector has completed its final shift.
Carefully extracted after 10 years of successful operation, this remarkable detector contributed to some of the LHC's most important discoveries.
🔗 cms.cern/news/cms-pixel…

🌌 What if the things we cannot see hold some of the biggest clues about our Universe? Researchers at CMS closely study particle collisions to see whether evidence of dark matter could be hidden in the data! Happy Dark Matter Day 2026! #DarkMatter

CMS is announcing five new results for the Higgs 2026 conference. As the conference gets underway in Louvain, Belgium, here's an evolving page featuring our highlights: cms.cern/news/cms-higgs…

🤫 The η meson's latest rare secret: CMS observes the η meson decaying into two muons and two charged pions for the first time.
Read more: cms.cern/news/eta-meson…

Heavy-ion collisions at the LHC create a plasma that existed in the early universe. For the first time, CMS is using “event-shape engineering” to investigate how charm quarks fly in the expanding geometry of this extraordinary medium.

Read more: cms.cern/news/carried-c…

The CMS Collaboration has presented 6 new results at the 19th International Workshop on Top Quark Physics (TOP 2026), held from October 5 to 9, 2026, in the Antalya Region of Türkiye.

Explore the results and their technical description here: cms.cern/news/cms-top-2…

A breakthrough is not just about the discoveries we make today, but also about empowering the people who will make tomorrow's discoveries possible.

Congratulations to the inaugural cohort of the CMS Breakthrough Prize PhD Awards 2026!

Full story here: cms.cern/news/2026-cms-…

Incredible views underground, as teams are carrying out the complex work needed to prepare the CMS detector at @CERN for the High-Luminosity era.

📷 Andres Delannoy

#particlephysics #scienceinaction #HiLumiLHC

We only have moments to decide which collisions are worth keeping. With more ideas than researchers and more data than we can store, the big question is: how do we make sure we don’t throw away the discovery we’re not yet looking for?

👉 Full blog here: cylindricalonion.web.cern.ch/blogs/protecte…

Could the invisible leave footprints in our detectors?
CMS performs the first collider search for "inelastic dark matter" in the case where dark-matter particles travel a measurable distance before decaying into a pair of low-momentum electrons.
Read more: cms.cern/news/chasing-d…

Welcome Tae-Jeong Kim, the new Deputy Spokesperson alongside Florencia Canelli and Spokesperson Anadi Canepa for the CMS Collaboration for 2026-2028!

Thanks to outgoing Deputy Spokesperson Hafeez Hoorani for representing CMS from 2024–2026.

Read more: cms.cern/index.php/news…

When rare decays enter the precision era...
The CMS collaboration CERN keeps seeing the same intriguing pattern in decays of bottom quarks to strange quarks and two muons: systematically lower rates than predicted by the Standard Model!
👉Read more cms.cern/news/when-rare…

🧩 Big science, small scale!

We built a miniature version of the CMS detector at CERN, from multiple 3D-printed parts.

👉 Watch the timelapse of the assembly process here: youtu.be/HVJu10uq1z0

📃 Read the story behind the design: cylindricalonion.web.cern.ch/blogs/how-i-sh…

Model originally designed by James Wetzel and made available by Alex Iribarren

🛠️ Every upgrade begins with a goodbye.

As CMS prepares for the High-Luminosity LHC era, long-serving detector components are being retired.

Read Sioni Summers' blog on removing part of the CMS trigger system during this exciting transition: cylindricalonion.web.cern.ch/blogs/out-old

🪡A needle in the pileup: CMS revives diffractive physics with tagged protons using its iconic Roman Pot detector system.
👉Read more: cms.cern/news/needle-pi…

Step inside CMS from wherever you are, this September 25th, for European Researchers’ Night. Book a LIVE virtual visit of the detector and bring your questions straight to us.
🕑 Virtual visit slots available from 14:00 to midnight CEST
👉 Book yours now: cms.cern/interact-with-…