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…
When it comes to top quark mass measurements, the CMS collaboration has the largest and most complete collection of publication-quality results, covering a wide range of methods and approaches. In a recent review paper, an overview is given of all…
The CMS experiment has just reported the observation of quantum entanglement between a top quark and a top antiquark, simultaneously produced at the LHC.
In quantum mechanics, a system is said to be entangled if its quantum state cannot be described…
Back in September 2022, four months after the start of the LHC Run 3, the CMS collaboration released the first measurement using data at the new collision energy of 13.6 TeV. Using the data recorded only in two months – less than 1% of the LHC goal…
Even after almost 30 years since its discovery, the top quark is still offering unprecedented opportunities to improve our understanding of nature. It is the heaviest known elementary particle and its special features help us understand the…
The ATLAS and CMS Experiments at CERN have just released a new measurement of the mass of the top quark. The new result combines 15 previous measurements to give the most precise determination of the top-quark mass to date.
Among the known…
Peter Higgs and François Englert received the Nobel Prize in Physics after the 2012 discovery of the Higgs boson with a mass of 125 GeV. Its existence provided experimental evidence of the predicted ‘Higgs field’ that pervades the universe and…
In the thrilling world of particle physics, our mission at the Large Hadron Collider (LHC) is to explore the mysteries of the universe by conducting experiments and pushing the boundaries of the Standard Model (SM). The SM is a wonderful theoretical…
The standard model of particle physics (SM) is one of the most precise theories ever conceived, capable of predicting certain quantities with up to 14 digits of precision. The LHC is a marvel of modern experimental physics and precision…
CMS observed the simultaneous production of four top quarks, one of the rarest physics processes ever observed at the LHC, opening the door to detailed searches for physics beyond the Standard Model (SM).
Ever since its discovery at the…
The CMS collaboration has seen evidence of a rare mechanism to produce four top quarks. The simultaneous production of four top quarks is predicted by the standard model and, as a bonus, the process is sensitive to many hypothetical undiscovered…
On 5 July 2022, the LHC surpassed the previous energy limits of experimental particle physics, breaking its own record by achieving stable proton-proton collisions at a center-of-mass energy of √s = 13.6 TeV. This marked the start of Run 3, the…