Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session G09: Detector R&D I |
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Sponsoring Units: DPF Chair: Roger Rusack, University of Minnesota Room: Sheraton Governor's Square 11 |
Sunday, April 14, 2019 8:30AM - 8:42AM |
G09.00001: Performance of missing transverse momentum reconstruction at the CMS detector in 13 TeV data Samuel J May The precise measurement of the missing transverse momentum (MET) observable is critical for standard model measurements involving W, Z, and the Higgs bosons, and top quarks. In addition, MET is one of the most important kinematic observable used in searches for physics beyond the standard model targeting new weakly interacting neutral particles. A detailed understanding of various effects due to the high collision rate at the CMS detector during the 13 TeV data-taking period of the LHC both in data and simulation is important to achieve the most optimal MET performance. In this talk, we will present the studies of MET reconstruction algorithms using the CMS detector at the LHC. |
Sunday, April 14, 2019 8:42AM - 8:54AM |
G09.00002: Calibration & Alignment of the CMS Electromagnetic Calorimeter Tanvi Wamorkar The electromagnetic calorimeter (ECAL) of the Compact Muon Solenoid (CMS) detector at the CERN Large Hadron Collider is a homogenous, scintillating lead tungstate crystal calorimeter, designed to achieve excellent energy resolution. Precise calibration and alignment of the CMS ECAL is crucial for maintaining the excellent ECAL performance required for many physics analyses. To ensure uniformity across the ECAL, a relative inter-calibration is performed across all channels, using a few different methods. The position measurements provided by ECAL are also calibrated relative to the CMS tracker. Since energy deposits in ECAL are the only way to provide position measurements for photons, the ECAL alignment procedure is critical for the measurement of Higgs boson decays to two photons, and is also an important tool to identify and remove electrons misidentified as photons. After an introduction to the characteristics of the CMS ECAL, I will briefly describe the details of the different inter-calibrations methods and their combined performance with CMS Run 2 data. I will also discuss in detail the dedicated ECAL alignment procedure based on matching the positions reconstructed by CMS ECAL and tracker, and I will present the latest results from the ECAL alignment. |
Sunday, April 14, 2019 8:54AM - 9:06AM |
G09.00003: Precision Timing with the CMS MIP Timing Detector Matthew L Joyce The Compact Muon Solenoid (CMS) detector at the CERN Large Hadron Collider (LHC) is undergoing an extensive Phase II upgrade program to prepare for the challenging conditions of the High-Luminosity LHC (HL-LHC). In particular, a new timing layer will measure minimum ionizing particles (MIPs) with a time resolution of ~30ps and hermetic coverage up to a pseudo-rapidity of |η|=3. This MIP Timing Detector (MTD) will consist of a central barrel region based on LYSO:Ce crystals read out with SiPMs and two end-caps instrumented with radiation-tolerant Low Gain Avalanche Diodes. The precision time information from the MTD will reduce the effects of the high levels of pile-up expected at the HL-LHC and will bring new and unique capabilities to the CMS detector. The time information assigned to each track will enable the use of 4D reconstruction algorithms and will further discriminate interaction vertices within the same bunch crossing to recover the track purity of vertices in current LHC conditions. We present motivations for precision timing at the HL-LHC and the ongoing MTD R&D targeting enhanced timing performance and radiation tolerance. |
Sunday, April 14, 2019 9:06AM - 9:18AM |
G09.00004: Test beam studies of precision timing with the upgraded CMS electromagnetic calorimeter Michael Plesser The electromagnetic calorimeter (ECAL) of the Compact Muon Solenoid Experiment (CMS) is a homogeneous scintillating crystal calorimeter designed to measure the energies of electrons and photons at the Large Hadron Collider (LHC) with excellent resolution. The CMS ECAL will be upgraded to meet the challenging requirements of the High-Luminosity upgrade of the LHC (HL-LHC). Particular challenges at the HL-LHC are the harsh radiation environment, the increasing data rates, and the extreme level of pile-up events, with up to 200 simultaneous proton-proton collisions. We will present test beam studies of the new readout electronics, which must be upgraded due to the increased trigger and latency requirements at the HL-LHC. In particular, we will focus on test beam studies of the timing resolution with the upgraded CMS ECAL readout electronics, which will be around 30 ps for high energy photons and electrons. |
Sunday, April 14, 2019 9:18AM - 9:30AM |
G09.00005: HGCal Front End Trigger Algorithm Studies James Bueghly, Nathaniel Odell, James Hirschauer For the upcoming high-luminosity run of the Large Hadron Collider, the Compact Muon Solenoid (CMS) Collaboration will replace the endcap electromagnetic and hadronic calorimeters with a High Granularity Calorimeter (HGCal). The proposed HGCal design includes a front end Concentrator ASIC, which, among other tasks, determines what raw trigger information is passed through to the Level I trigger system. The choice of trigger algorithm for this task depends on a variety of factors, including detector occupancy, bandwidth constraints, energy resolution, shower shape reconstruction, and overall physics performance. We will present studies comparing the performance of multiple potential front end trigger algorithms, and discuss the outlook and timeline for selecting the best algorithm for the eventual HGCal Concentrator chip design. |
Sunday, April 14, 2019 9:30AM - 9:42AM |
G09.00006: Electrical Tests of ATLAS ITk Barrel Strip Tracker at Brookhaven National Lab Guy Rosin The ATLAS experiment is currently running with pp collisions at |
Sunday, April 14, 2019 9:42AM - 9:54AM |
G09.00007: Efficiency studies for the gFEX hardware trigger in Phase I ATLAS upgrades Emily A Smith, David W Miller The global Feature Extractor (gFEX) is a Level 1 jet trigger that will be installed in ATLAS during Phase 1 upgrades. The gFEX will use large-radius jet algorithms refined with subjet information to select Lorentz-boosted objects like bosons and top quarks. With higher luminosities of the LHC approaching, triggers must cope with intense environments. Knowledge of the gFEX’s efficiency is critical as it is directly related to what data is captured by ATLAS. This study of gFEX efficiencies determines how well it performs on complicated objects and sets benchmarks for its performance using simulated samples assuming pp collisions at √s = 13 TeV with the ATLAS detector. The gFEX board includes a System on Chip with a GPU that is not currently utilized. These studies looked at the feasibility of utilizing the GPU for image classification or machine learning algorithms. I obtained metrics which provide important information on the GPU’s ability to process data. Further stress testing is needed to determine the true limits of the GPU function, but it looks probable that the GPU could be useful in the context of the gFEX hardware trigger to apply machine learning algorithms to generate further information on jets with complicated substructure. |
Sunday, April 14, 2019 9:54AM - 10:06AM |
G09.00008: Updating flavor tagging parameterizations and MV2 hybrid sample training for the HL-LHC upgrade studies at the ATLAS detector Madhuranga Thilakasiri Madugoda Ralalage Don The Large Hadron Collider (LHC) will be upgraded for High Luminosity by 2025. Thus, the ATLAS detector at the LHC will undergo a major modification where a new all-silicon inner tracking detector (ITk) will replace the existing inner tracker. While coping with the increased luminosity, the new detector is also expected to provide an additional sensitivity in the very forward region. Simulated performance studies for the new detector are ongoing, including the evaluation of b-tagging performance (the ability to identify jets that contain a b-hadron), which plays a crucial role in various physics studies. I will present the results from the training of the multivariate b-tagging algorithm used by the ATLAS collaboration for the new tracker. |
Sunday, April 14, 2019 10:06AM - 10:18AM |
G09.00009: Design of a time-to-digital converter (TDC) ASIC for the Phase- II upgrade of the ATLAS muon spectrometer Yuxiang Guo To cope with a large amount of data and high event rate expected from the planned High-Luminosity LHC (HL-LHC) upgrade in pp collisions at √s = 13 TeV with the ATLAS detector, the ATLAS Monitored Drift Tube (MDT) detector will be used at the first-level trigger to improve the muon transverse momentum resolution and thus reduce the muon trigger rate. A new trigger and readout system has been proposed and the current MDT readout electronics will be replaced. In order for the new trigger system to digitize the discriminated muon drift signal, a new time-to-digital converter (TDC) Application Specific Integrated Circuit (ASIC) is needed. We have designed a TDC ASIC prototype using the TSMC 130 nm CMOS process and studied its performance such as timing, latency and power consumption. In this talk, I will present the design and test results of this new prototype. |
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