CMS
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…
Read moreThe Higgs boson as a probe for new physics
The discovery of the Higgs boson has ushered in a new era of exploration at the Large Hadron Collider (LHC). Persistent tensions in the Standard Model (SM) of particle physics compel us to seek out physics beyond the SM (BSM) at the TeV scale, and…
Read moreCMS 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,…
Read moreRemoval of the CMS beam pipe during Long Shutdown 2
The CMS detector is built from several different layers, surrounding the beam pipe in which the LHC beams collide. The subdetector that is closest to the collisions is the pixel detector. It has a functionality similar to a digital camera taking 40…
Read moreCMS upgrade plans for LS2
To achieve the full benefit of the HL-LHC, CMS must continue to be able to reconstruct at the much higher luminosity all the standard physics analysis objects with high efficiency, low fake rate, and high resolution. Excellent electron, photon, and…
Read moreHL-LHC computational challenge for ATLAS and CMS experiments
The two general purpose LHC Experiments, ATLAS [1] and CMS [2], are going to be confronted with challenging experimental conditions at the High Luminosity LHC Run (HL-LHC), starting in 2026. In particular, computing systems will have to cope with…
Read moreHiggs boson observed decaying to bottom quarks
Last month, the ATLAS and CMS collaborations jointly announced the discovery of the Higgs boson decaying into a matter-antimatter pair of bottom quarks. Previously, the Higgs boson has been observed decaying to photons, tau-leptons, and W and Z…
Read moreDeveloping new electronics for the CMS tracking system
The High Luminosity Large Hadron Collider (HL-LHC) entails a substantial upgrade of the CMS tracking system, to cope with much more demanding requirements and to implement additional functionalities. One of the main challenges for the experiments is…
Read moreAxion-like particle searches at the LHC
The Standard Model (SM) of Particle Physics is plagued by some longstanding conceptual and practical questions, and we have to go beyond the Standard Model to address them. A guiding principle of the Standard Model is that we should expect to see…
Read moreMapping the CMS inner tracking system with unprecedented precision
In an experiment like CMS, it is important to know where all the detector material is. For example, in order to properly simulate the detector response, you need to know not only where the sensors are, but also the locations of the inactive material…
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