CMS Experiment

European Researchers' Night 2025

European Researchers' Night takes place on the 26th of September this year, and it is projected that around 1.5 million people will be involved in the various activities over the day and night.

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CMS presents first results with 13 TeV at 2015 EPS-HEP Conference

A 13TeV collision recorded by the CMS detector showing two high-energy particle jets with a collective mass of 5 TeV. Image: Thomas McCauley and Tai Sakuma

Note: This document is also available in the following languages (PDFs).

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Physics Awards for the "Founding Fathers" of CMS

Tejinder Virdee (left) and Michel Della Negra in the CMS Control Room

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CMS is preparing for high-luminosity run at 13 TeV

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CMS embarks on data collection at 13 TeV

One of the first collisions with "stable beam" at 13 TeV recorded by CMS

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LHC collides protons at 13 TeV to tune accelerator

Record-breaking collisions seen by CMS

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Front Page Form

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A very rare decay has been seen by CMS

Image 1: A candidate B<sub>s</sub> → μμ event recorded in the CMS detector in 2012, produced in proton-proton collisions at 8 TeV. (Ultra-high-resolution image below, Image 5.)

CMS Experiment, CERN

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LHC delivers low-energy collisions to CMS and other experiments

This di-jet event produced from proton-proton collisions was detected in the CMS detector. The green bars represent the energy deposited in the electromagnetic calorimeter and the blue ones represent the energy in the hadron calorimeter. The total energy is approximately 30 GeV in each jet. Click on image for high-resolution version. (Image: Tom McCauley / Tai Sakuma)

First proton-proton collisions after LS1

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CMS is never idle

Before proton collisions take place again at the LHC, the CMS detector has been looking at the result of collisions of cosmic particles high up in the atmosphere. This event display shows the track of a muon that reached the CMS detector 100 m underground and passed through the muon chambers (in red) and the silicon tracker (in yellow). Muons as this one are used to calibrate the detector in advance of proton collisions.

CMS is eager to see the first collisions of the LHC Run2. The recent news that the LHC restart may be delayed because of a hardware issue gives us extra time to prepare for those collisions.

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