CMS

Towards high-precision luminosity for CMS in Run 3 and beyond

Luminosity is a key parameter for any collider-based high energy physics experiment as it links the interaction rates observed in an experiment to the cross sections of physics processes. Therefore, it is a key ingredient to most major analyses…

Heterogeneous computing efforts for high-energy physics experiments

Substantial improvements to the current experiments at the LHC are underway, and new experiments are being proposed or discussed at future energy-frontier accelerators to answer fundamental questions in particle physics. At future hadron colliders,…

Deep Neural Networks for particle reconstruction in high-granularity calorimeters

Precision measurements in high energy physics as well as an increasing amount of searches for new phenomena rely on a precise reconstruction of the event that caused a particular signature in the detector. Particle ﬂow algorithms [1, 2, 3, 4] aim to…

AMVA4NewPhysics legacy in searches for new physics

*/ A couple of months ago, the four-year life cycle of AMVA4NewPhysics, a Horizon2020-funded Marie Skłodowska-Curie Innovative Training Network (ITN), in which CERN participated as one of the member institutions, was completed. With the…

Precision timing upgrade of the CMS detector

Soon after 2027, the LHC will enter the high luminosity era, known as HL-LHC. It will begin operations at a stable luminosity of 5.0×1034 cm−2 s−1, resulting in much higher collision rates than currently achievable, but with a pileup of 140…

Re-discovering the Higgs boson in the Cloud

It’s hard to believe that it has already been more than seven years since the discovery of the Higgs boson. Since then, numerous papers have been published by the ATLAS and CMS collaborations measuring the long-awaited particle’s properties in…

CMS Open data in use

“[...] The release of data could create a community of users which may be nurtured through regular events organized by CMS.[...]” This is a phrase in the CMS data preservation, re-use and open access policy, which was first approved seven and…

A new home for GEM detectors at CERN

Since the beginning of 2019, a new building at CERN is ready to house ongoing R&D activities that will push the performance of detectors to cope with the high performance of the LHC. Building No.107 (replacing the building 102) offers a…

The GEMs of CMS

To prepare for the higher collision energy and luminosity of the subsequent running period of the LHC significant improvements are ongoing in the CMS detector. One of the planned upgrades is the installation of large-area GEM detectors in the…

CMS Trigger: Lessons from LHC Run 2

The CMS experiment has a two-level trigger system [1], to reduce the number of events stored from the LHC bunch crossing rate of 40 MHz to around 1 kHz. The first level (the Level-1) uses custom electronics to reduce the rate of events to 100 kHz,…

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