CERN Accelerating science

Physicists at the CMS experiment have been searching for new particles in exciting new places. In a recently published paper, they explore the possibility that the Large Hadron Collider (LHC) could be producing never-before-seen particles that travel into the CMS detector before transforming into known particles. And because no one knows for sure what undiscovered particles might look like, the scientists design the search to be as simple as possible to make sure it can test many theories at once, including ones that have yet to be imagined.

CMS experiment recently made a new measurement of Higgs boson coupling strength to the charm quark, putting the best constraint so far on the anomalous value compared to the prediction from the standard model. Using the complete data volume of Run 2, and using state-of-the-art techniques of machine learning aptly, the scientist developed a very sensitive methodology for identification of jet originating from a charm quark. Further by taking into account all possible values for the Higgs boson momentum being low or high, they considered distinct possibilities for the two jets from the Higgs boson decay being separated or collapsed in space. Again deep learning methods helped here to achieve the goal.

A few months are left before the start of Run 3 at CERN. With the timely completion of all upgrades planned for Long Shutdown 2 (LS2), in the last weeks the CMS detector has been set in its closed configuration.

The challenge of Run3: CMS is preparing to resume its operations for the Run-3 of the Large Hadron Collider (LHC) after a 3-year long shutdown called LS2 (2019-2021).

The CMS collaboration is happy to congratulate its members Dr. Austin Ball and Professor Phil Butler who not only made significant contributions to science but are also highly honoured in their respective countries for their achievements. 

The installation of a new prototype of  CMS muon chambers was completed last December. With these installations, the CMS detector is taking further steps towards the HL-LHC era at CERN. 

The word lepton comes from the Greek λεπτός (leptós,) meaning “small”;  the electrically charged leptons (electrons, muons, and taus) have much smaller masses than their counterparts in the quark sector.

Before saying goodbye to 2021, we’re proud to look back at major milestones reached by CMS collaboration both on physics results and detector upgrades along the year.