When we look at ourselves in a mirror, we see a virtual twin, identical but with left and right inverted. Charge-parity (CP) is the equivalent of a mirror for fundamental particles. If the symmetry was respected in nature, each particle would see a…

From time to time, we need to take our cars in for a checkup to make sure everything is up to speed, and here we check up on how well our CMS detector is working. The CMS detector is one of the main detectors at the Large Hadron Collider (LHC) at…

How an evacuation of the CMS experimental cavern has provided invaluable human behaviour data to improve the emergency preparedness for complex underground facilities. CERN and CMS strive for excellence in safety matters, with a commitment to…

As a next step towards more open access to science, the CMS collaboration has just released in electronic format a set of likelihood functions describing early measurements of the Higgs boson. The full statistical model and the data used to make the…

In physics research, results are frequently represented in complex diagrams, and colour is an essential tool to help the reader extract key information.  Making sure our colour schemes are friendly to people with colour-vision deficiency (CVD…

Peter Higgs was one of the pioneers who brought the electroweak theory and the Standard Model of particle physics into being in the 1960s. He posited a new field and particle that would provide a mechanism for how elementary particles gain mass. The…

Above: Test bench for time resolution measurement of LYSO arrays coupled with SiPMs In the last few weeks, the first batch of Ce:LYSO crystals, a type of scintillating crystals, has been delivered to the Sapienza University of Rome ready for…

The CMS collaboration released over 40 new results in Winter 2024, presented at various conferences around the world. The largest part of these results has been presented for the first time at the Moriond 2024 conferences: Electroweak Interactions…

  Welcome back to the mini-series about waking up the CMS detector after the YETS - Year End Technical Shutdown. As spring approaches, it is time to turn all parts of the CMS detector back on and make sure everything is functioning smoothly for…

Following its mission to address fundamental questions about Nature, the Large Hadron Collider (LHC) has operated at different center-of-mass energies, colliding protons and/or heavy ions. In heavy ion collisions, the nucleons (protons and neutrons…

The CMS experiment at CERN is proud to announce the first release of 13 TeV proton-proton collision data collected in 2016. Over 70 TB of 13 TeV collision data and 830 TB of corresponding simulations are now accessible to the global scientific…

A fundamental parameter of the Standard Model, the electroweak mixing angle plays a key role in the “Higgs mechanism”, when the W and Z gauge bosons get their masses through electroweak symmetry breaking. CMS has now reported a new measurement of…