In a first measurement of its kind at the LHC, the CMS experiment tests whether top quarks adhere to Einstein’s special theory of relativity, and improves the bounds on noncompliance by up to a factor of one hundred with respect to previous…
Top quarks are the heaviest known elementary particles, as heavy as a tungsten atom. In high energy proton proton collisions at the LHC about 10 pairs of a top quark and its antiparticle are produced every second. But they are not here to…
Recently, and about two decades after the first solid proof of entanglement between two photons by Anton Zeilinger and his team, the ATLAS and CMS experiments reported the observation of quantum entanglement between the top quark and its…
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…
Amongst all known elementary particles, the top quark is peculiar: weighing as much as a Tungsten atom, it completes the so-called 3rd generation of quarks and is the only quark whose properties can be directly measured. Owing to its mass, the top…
CMS has presented a rich variety of results at the Electroweak Interactions and Unified Theories sessions of the Rencontres de Moriond conference in La Thuile, Italy. Links to the Physics Analysis Summaries (PAS) from CMS made public in the last…