A new result by the CMS Collaboration narrows down the mass of the Higgs boson to a precision of 0.1%. After reporting the observation of the Higgs boson at the CERN LHC in 2012, scientists the ATLAS and CMS Collaborations have been busy…

On July 25th, 2019, the very first GEM superchambers were installed into the CMS YE- endcap as part of the newest CMS muon subsystem, GE1/1. And while this was a fantastic accomplishment worth celebrating, it was only the beginning of the story.…

The CMS Young Researchers Prize dates back to 2012, when seven scientists from the CMS and ATLAS collaborations, as well as from the LHC project, were recognised by the Fundamental Physics Prize Foundation for their leadership role in the discovery…

The high-granularity calorimeter (HGCAL) is a major upgrade of CMS, and is necessary to maintain excellent calorimetric performance in the endcaps during HL-LHC operations. HGCAL is one of the most ambitious detector projects undertaken, due to the…

For the first time, CMS physicists have measured the production rate of top quark pairs as a function of three experimental observables simultaneously. The new result helps to answer several fundamental questions, among which, the properties of…

Congratulations to five CMS scientists, Tulika Bose, Yuri Gershtein, Andrei Gritsan, George Wei-Shu Hou and Markus Klute, who were elected as American Physical Society (APS) Fellows in 2019 for their exceptional contributions to the field of physics…

For the first time, CMS physicists have investigated an effect called the “running” of the top quark mass, a fundamental quantum effect predicted by the Standard Model. Mass is one of the most complex concepts in fundamental physics, which went…

When the CMS experiment records particle collision events, a large number of unwanted extra collisions overlap in the detector and hide the rare particle collision that is worthwhile studying. CMS physicists have developed a new method that…

New algorithms from the Compact Muon Solenoid experiment use the ideas used in mobile phone facial recognition to better understand the collisions at the Large Hadron Collider. One of the most exciting challenges at the Large Hadron Collider is the…

As part of the LHC Long Shutdown 2 (LS2) activities at CMS, the CMS Muon Cathode Strip Chamber (CSC) subsystem is having its electronics upgraded in the chambers closest to the beam line. This is done in anticipation of challenges it will face when…

The Bs  meson is a bound state of a strange quark and a beauty antiquark – as such it possesses both beauty and strangeness! For many years, searches for an extremely rare decay of the Bs meson, to a μ+μ-  pair, remained a holy grail…

The CMS Gas Electron Multiplier (GEM) subsystem will form an extra layer of detectors, along with the Cathode Strip Chambers (CSC) layers, closest to the beam. The GEM's ability to cope with a very high particle rate will greatly improve…