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…

Cosmological observations tell us that Dark Matter makes up roughly 80% of all the matter in the Universe. However, no Dark Matter particle has ever been observed. To verify whether it can be produced in the laboratory, the CMS Collaboration at the…

    The J/ψ meson, a remarkable particle simultaneously discovered by two independent experiments in 1974, has a unique place in the world of experimental particle physics. By revealing the existence of an extra “flavour” of quarks, it…

If you have ever had Neapolitan gelato, you know how important it is to combine three different flavours, each in just the right size. And the Standard Model (SM) of particle physics is not less tasty than that! In the SM, leptons are some of the…

The discovery of the Higgs boson (H), particularly with its decay into two electroweak gauge bosons WW and ZZ, marked a milestone in particle physics. This groundbreaking discovery not only answered long-standing questions but also inspired new…

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…

A new CMS paper describes how the CMS experiment can squeeze more physics out of the LHC data by using smarter data selection/reduction techniques. The Large Hadron Collider produces an avalanche of data; the beams collide 40 million times per…

  The Standard Model (SM) of particle physics has been a cornerstone of our understanding of the subatomic realm, providing precise predictions, many of which have been tested by the ATLAS and CMS experiments at the CERN LHC. However, despite…

  The Higgs boson plays a crucial role in the standard model of particle physics. It is the only particle whose field has nonzero vacuum expectation value. It’s like having a special wave whose status of minimum energy (the “vacuum”) has an…

Even if the standard model of particle physics (SM) describes Nature incredibly well, it fails in providing insight to a number of observations such as the existence of dark matter. How do we get a better (and bigger) model than the SM? From the…

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…