CMS Experiment

Unveiling B Meson Production at CMS

The ratios of the B meson production fractions have been measured for the first time in the CMS experiment.

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CMS at Moriond 2025

The CMS Collaboration announces 50 new results for Moriond 2025.

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Peeking inside the proton: the story of Z+ϒ

CMS discovers associated production of a Z boson and an ϒ meson.

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Shiny new luminosity and beam conditions instrumentation for CMS

New BRIL subsystems illuminate CMS’s path through Run 3

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First Tracker Support Structures, TBPS Rings, in production for Hi-Lumi CMS!

The TBPS Rings are in production, offering an innovative design to incline sensors toward the LHC beam and maximise coverage. They are the first support structures in production for the new Tracker!

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Hi-Lumi iRPC Muon chambers installed in CMS in record time!

The first of the improved Resistive Plate Chambers for Hi-Lumi CMS were installed in record time during the LHC winter break.

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The Higgs boson with toppings

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Installation of Next-Generation CO2 Cooling System for Hi-Lumi CMS

CERN and CMS engineers and technicians have installed the first two of nine required next-generation carbon dioxide (CO₂) cooling plants in the underground Service Cavern of the CMS experiment in Cessy, France, as well as two of the accumulators.