ATLAS

The ALICE, ATLAS, CMS and LHCb collaborations received the 2025 Breakthrough Prize in Fundamental Physics on behalf of the CMS Collaboration on April 5, 2025.

The CMS collaboration has observed an unexpected feature in data produced by the LHC which could point to the existence of the smallest composite particle yet observed.

The ATLAS collaboration measured the W-boson width at the LHC for the first time. The W-boson width had previously been measured at CERN’s LEP collider and Fermilab’s Tevatron collider. This is the most precise measurement to date made by a single experiment, and—while a bit larger—it is consistent with the Standard-Model prediction to within 2.5 standard deviations.

Scientists on the ATLAS collaboration performed the highest-energy measurement of quantum entanglement.

What happens when you pair CERN scientists with science fiction writers to create short stories inspired by particle physics?

The ATLAS and CMS experiments have observed a process 4,000 times rarer than the production of Higgs bosons.

Kétévi Assamagan’s contributions to physics go beyond his research at the Large Hadron Collider.

For the first time, physicists have a statistically significant measurement of the joint polarization of W and Z bosons.

In new papers by the CMS and ATLAS Collaborations, physicists detail high-precision results from their latest Higgs boson studies.

The 2013 documentary Particle Fever follows physicists from the start-up of the LHC through the discovery of the Higgs boson. Where are those physicists now?