The LHCb detector has undergone a large update during Long Shutdown 2 involving both subdetectors and the Trigger and Data acquisition systems. This talk will briefly cover the most important upgrades in the Trigger system and present how the inclusive radiative lines have been modernized to run optimally in the new conditions.
Emphasis will be given to:
- Evolving to a ‘hardware-less’...
The online event selection in ATLAS takes place in two stages. At the first level trigger (Level-1), hardware-based, custom electronics and information from the calorimeters and muon spectrometer are used to select events. At the second and final stage, the High Level Trigger (HLT), software-based, various object-specific algorithms as required by different analysis groups apply further...
The performance of the HLT and OMTF for displaced muons is presented. In Run3, new HLT paths designed to trigger on displaced muons have been added. In addition to the displaced standalone muon paths that were present in Run2, these new paths are designed to trigger on displaced global muons. Several improvements have also been made in the L1 trigger system to identify displaced muons. A new...
TileCal is a hadron calorimeter located in the central region of the ATLAS experiment at the Large Hadron Collider. It is comprised of iron absorbers and scintillator tiles that produce light when charged particles cross the tiles, which is then collected by photomultiplier tubes. The signals from the photomultiplier tubes are digitized in sync with the LHC clock and transmitted to the...
To handle the throughput required for the Phase-2 L1T, the detector electronics must be improved using cutting-edge technology such as high bandwidth optical data transfer. Additionally, new electronics with deeper buffering and faster processing are required to meet the increased standards for data gathering in terms of latency.
The overlap muon track finder (OMTF) allows to reconstruct...
The challenging conditions expected during HL-LHC require a series of upgrades to reach its ultimate luminosity. A large fraction of the detector´s instrumentation, particularly, the trigger and readout electronics will need to be substituted to fully exploit the increased luminosity and cope with the increased occupancy and radiation in the detectors. Ultimate performance is expected to be...
The CMS Drift Tube (DT) trigger system reconstructs muon signals with great efficiency by correlating signals inside each DT chamber. A new layer of FPGA-based electronics, the so-called DT Phase 2 Filter, capable of simultaneously correlate information from several DTs, will be included in the CMS Muon system for the upcoming era of the High Luminosity LHC. A review of the different...
As we push to increase the instantaneous luminosity of the ATLAS detector, strict requirements on events are needed in order to reduce the output rate to the desired 1-1.5kHz. We can be clever about how we select events; imposing topological requirements through kinematic and angular cuts on combinations of particles allows us to further reduce the event rate without having to tighten the...
Abstract:
Neutral pions and photons play a crucial role in the LHCb physics program since they are used in a variety of physics analyses. These particles are not electrically charged and therefore cannot be detected by the tracking system. Instead, their energy and position can only be measured by the electromagnetic calorimeter sub-detector (ECAL).
During Run I and Run II, energy and...
Allen is the GPU implementation of the High Level Trigger of LHCb. It is able to run the full reconstruction at a 30 MHz and reduce the rate by a factor of 30/60.
A tracking algorithm using only the VErtex LOcator (VELO) and the MUON system, implemented in the Allen framework, is presented. The long distance between the VELO and the MUON systems - together with a precise parametric...
Reconstruction algorithms or more generally any algorithm bound to serve in the trigger needs to fulfil given efficiencies and accuracies to comply with the physics necessities, but also be compatible with a given time budget. Increasing data throughputs are often a challenge that classical algorithms and approaches cannot sustain. For this reason, new strategies are required. Some techniques...
