On Friday 7th October the LHC delivered, for the first time in the history of High Energy Physics, proton-proton collisions at the design frequency of 40 MHz, with bunches of protons colliding every 25 nanoseconds (ns), doubling the frequency…

Watch the very first TV episode of "What's new @ CERN" featuring CMS physicist Yves Sirois, John Ellis and other physicists talking about the Higgs Boson, the Standard Model, Supersymmetry and neutrinos. "What's new @ CERN" is a new monthly outreach…

The LHC has now delivered over 4 inverse femtobarns (fb−1) of data in 2011, of which CMS has collected 3.7 fb−1.

The international physics masterclasses allow high-school students to spend a day at a research institute and analyse real data from high-energy physics experiments. Conducted under the aegis of the International Particle Physics Outreach Group (…

Next short Technical Stop will take place from Monday the 7th to Friday the 11th of November 2011

On the evening of 23rd September CMS welcomed, for the second successive year, young local students to point 5 for an experience they will never forget - and this time we joined forces with TOTEM. As part of the European Researchers' Night, around…

Have a look at the new FAQ concerning helmet (hard hat):

Over the course of 16.5 hours ending Wednesday, Sept. 14, the CMS experiment recorded 113.4 inverse picobarns of data, more than three times the 36 inverse picobarns it recorded in all of 2010. The detector's data-taking efficiency was impressively…

CERN was a special guest this year at the famous Ars Electronica festival in Linz, Austria. The theme of this year’s festival 'Origin — how it all begins' relates to the diverse research carried out at CERN. Arts@CERN will collaborate with the…

A reminder on CERN Safety rules

It is well known that CERN is an open laboratory, welcoming visitors from around the world on a daily basis. Often these visits are organised by schools or colleges, or are simply part of a family vacation to the Geneva area. Many VIPs also visit,…

The number of events that an experiment observes is proportional to a quantity called the luminosity — a measure of how many collisions are occurring in the detector. An accelerator operating at high luminosity stands the best chance of producing…