Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session B12: Particle Physics Instrumentation IRecordings Available
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Sponsoring Units: DPF Chair: Lawrence Lee, University of Tennessee, Knoxville Room: Majestic |
Saturday, April 9, 2022 10:45AM - 10:57AM |
B12.00001: ATLAS Tau Trigger Algorithm for Global Trigger using Full Granularity Data Anni Xiong, Kirk Weedman, Stephanie A Majewski, Eric C Torrence, Katherine R Kaylegian-Starkey The High-Luminosity Large Hadron Collider (HL-LHC) is expected to deliver 10 times the integrated luminosity as the previous three runs combined, with approximately 200 inelastic collisions per bunch crossing. This large increase in pileup imposes significant challenges on the ATLAS Trigger and Data Acquisition system hardware electronics. To meet this challenge, the Global Trigger is designed to accept full-granularity data from the calorimeter and muon systems at 40 MHz to perform offline-like trigger algorithms. Hadronically decaying tau leptons play a key role in Standard Model (SM) measurements and searches beyond the SM, but taus are challenging to trigger on due to their resemblance to QCD jets. A window-based tau trigger algorithm is being developed for the Global Trigger firmware using system Verilog. The presentation will focus on the progress on both software and the firmware aspects of this algorithm development as part of the ATLAS HL-LHC upgrade. |
Saturday, April 9, 2022 10:57AM - 11:09AM |
B12.00002: ATLAS sTGC Trigger Chain Cosmic Ray Test Man Yuan The New Small Wheel (NSW) phase-I upgrade is an extremely challenging project for high-luminosity LHC operations to improve both tracking and trigger capability of the ATLAS muon spectrometer for discoveries at the LHC. |
Saturday, April 9, 2022 11:09AM - 11:21AM |
B12.00003: Search for Resonant and Non-Resonant VHH Production Nicholas G Kyriacou, Jianming Qian, Zhongyukun Xu, Matthew Klein, Nikolaos Rompotis, Tong Li, LianLiang Ma Studies of Higgs boson pair production (hh) represent the next crucial step to constraining the Higgs sector and allow the chance to refine measurements of the Higgs boson self-coupling. While previous searches have focused on the hh production in the gluon-gluon fusion (ggF) and vector-boson fusion (VBF) modes, this analysis documents a new search, with 139 fb-1 of pp collisions at √s = 13 TeV collected by the ATLAS detector in LHC Run 2, for di-Higgs production in the Vhh final-state. It searches for both resonant and non-resonant hh production, with only hh→bb¯bb¯ considered for simplicity, in association with a leptonically decaying vector boson (W or Z). While this process has a lower cross-section than ggF and VBF hh production, it offers a clean final state with relatively small backgrounds, due to the presence of leptons. The analysis benefits from small backgrounds and attempts to set limits for the first time on Vhh production. Analysis techniques and expected significance will be presented |
Saturday, April 9, 2022 11:21AM - 11:33AM |
B12.00004: Alignment System of the ATLAS Muon End-Cap New Small Wheels Camila Pazos The muon spectrometer of the ATLAS detector at the LHC consists of thousands of muon precision chambers. Precise muon track reconstruction is crucial in order to achieve the physics goals of the ATLAS experiment, but attaining the required level of precision is not trivial due to the size and nature of the muon detectors. To reach the 80 microns precision needed to obtain a 10% precision on 1 TeV-momentum muon, an optical-based alignment system has been designed and installed on the muon spectrometer. In this talk I will discuss the recent upgrades of the alignment system, which consists of thousands of coupled light sources and optical sensors, focusing on the construction and commissioning of the system for the New Small Wheels, a brand-new addition to the muon end-cap spectrometer. |
Saturday, April 9, 2022 11:33AM - 11:45AM |
B12.00005: Test beam and performance study of ATLAS New Small Wheel small-strip Thin Gap Chamber Xinmeng Ye The Large Hadron Collider is expected to reach an instantaneous luminosity of 5-7.5ⅹ1034cm-2s-1 towards high-luminosity runs in the future. The ATLAS Phase-Ⅰ upgrade plans to replace the present innermost station of Muon Spectrometer in the forward region, Small Wheels, with the New Small Wheel (NSW) detector system in order to improve Level-1 muon trigger selectivity and maintain good muon tracking capability under high background rate. The NSW features two gaseous detector technologies, Micro Mesh Gaseous Structures (MM) and small-strip Thin Gap Chambers (sTGC), with 2.4 million readout channels and a total surface area of more than 2,500m2. Both detectors have trigger and precision tracking capabilities. |
Saturday, April 9, 2022 11:45AM - 11:57AM |
B12.00006: Installation and Commissioning of the LHCb Upstream Tracker Joseph D Shupperd The Upstream Tracker (UT) for the Run III LHCb upgrade at the LHC is a silicon strip detector that is situated just upstream of the dipole magnet. This upgrade allows for a fast determination of track momentum and a fully software trigger. The various components of the UT were designed and constructed at different institutions around the world and brought together to be installed in the LHCb detector. This talk will showcase the installation and commissioning of the UT at the LHC. |
Saturday, April 9, 2022 11:57AM - 12:09PM |
B12.00007: Dark sector selections in the trigger for the LHCb Upgrade Kate Richardson In preparation for the increased luminosity of the next run of the LHC starting in 2022, LHCb is undergoing a major upgrade. These improvements include a removal of the hardware trigger, meaning the new system will be the first fully GPU-based trigger in high energy physics. The real-time analysis system must process over 5 TB/s and complete a full reconstruction of events. The final bandwidth has a maximum of 5 GB/s to long term storage, so it is crucial to persist data which contain the signature of physics of particular interest to the collaboration while discarding the rest with as much precision as possible. One such selection we are implementing is for di-muon and di-electron events which are a potential signature of a dark photon. LHCb has set world-leading limits on the dark photon and is projected to have an increased sensitivity to the dark photon from the increase in luminosity and upgraded detector. |
Saturday, April 9, 2022 12:09PM - 12:21PM |
B12.00008: Streamlining LHCb's Upgrade Trigger System Niklas Nolte The triggerless readout of data corresponding to a 30 MHz event rate at the upgraded LHCb experiment together with a software-only High Level Trigger will enable the highest possible flexibility for trigger selections. During the first stage (HLT1), track reconstruction and vertex fitting for charged particles enable a broad and efficient selection process to reduce the event rate to 1 MHz. Tracking and vertexing at 30 MHz represents a significant computing challenge. LHCb utilizes the inherent parallelism of the triggering process to meet throughput requirements with GPUs. This implies a major change in software that has to be integrated with data aquisition and the second HLT stage. This talk gives an overview of efforts to streamline both processing stages to ensure consistency across architectures and avoid errors and duplication. |
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