New physics may show up at the LHC in the form of yet unobserved particles which travel inside the detector before decaying, far from the point in space where they were produced. If these particles decay to photons, at CMS we can use the short but…

At the EPS-HEP conference this week the CMS collaboration presents new results of a powerful search that is motivated by a variety of new physics models that predict a signature of a bump in the production of the most frequently produced particles…

The CMS collaboration has recently released new results on how the top quark and Higgs boson interact, and this required a much deeper understanding of the production of top quarks together with bottom quarks.  The two heaviest known elementary…

The study of dark matter is one of the primary research topics at the CMS experiment. The standard model of particle physics describes the behavior of elementary particles with incredible accuracy but provides no explanation or possible particle…

Physicists at the CMS experiment are now very close to observing the simultaneous production of four top quarks (really two top quarks and two antitop quarks, but particle physicists describe this process as tttt) at the Large Hadron Collider for…

There is copious astrophysical and cosmological evidence for dark matter, but no indication of how it was produced, how it interacts with regular matter, or how it could fit into an inclusive model of particle physics. One possibility is that dark…

While the work on improvements on the detector continues during the Long Shutdown 2, physicists are starting to reap the rewards of the LHC dataset collected in LHC Run 2. The dataset is the largest sample ever collected at a collider and equivalent…

Since the discoveries of the third generation of quarks and leptons starting in the 1970s, physicists have asked the natural question "Can there be more generations?".  One of the first key results from the Large Electron Positron collider LEP…

Over the past century, physicists have developed a theory governing the fundamental interactions of elementary particles, known as the Standard Model of Particle Physics. Thus far, it has stood up to many experimental tests with an extraordinary…

The Standard Model of particle physics asserts that the Higgs boson generates the mass of all fundamental particles. In 2012 a new particle was discovered at the CERN LHC that behaves closely like the Higgs particle predicted by the Standard Model.…

After the discovery of the Higgs boson, CMS observed its interaction with some standard model particles like the bottom and top quark, the tau lepton, and the W and Z boson.  Measuring the strength of interactions with quarks and leptons (…

How long do fundamental particles live? In the Standard Model, we know particles can have many different lifetimes; from the top quark which decays in less than a millionth of a billionth of a billionth of a second, to stable particles like the…