Laboratory Director's Welcome
Bumblebee is a foundation model for particle physics discovery, inspired by BERT. By removing positional encodings and embedding particle 4-vectors, Bumblebee captures both generator- and reconstruction-level information while ensuring sequence-order invariance. Pre-trained on a masked task, it improves dileptonic top quark reconstruction resolution by 10-20% and excels in downstream tasks,...
In the high-luminosity era of the Large Hadron Collider (HL-LHC), the instantaneous luminosity will reach unprecedented levels, with up to 200 proton-proton interactions in a typical bunch crossing. To meet the challenges posed by the HL-LHC environment, the ATLAS Inner Detector will be replaced with an all-silicon system known as the Inner Tracker (ITk). The innermost part of the ITk will...
Data from the pixel luminosity telescope (PLT) for CMS needs to be cleaned thoroughly before being submitted for final integrated luminosity calculations for Run 3 data. Cleaning this data by hand is quite labor intensive, however very important to do so. In this talk I will discuss the anomaly detection algorithm I crafted to flag a variety of "anomalies" in the data - data points that need...
To ensure high-quality data acquisition at ATLAS, the detector status is monitored by a team of shifters in the control room where they watch plots of the incoming data and compare them with the expected standards. We propose the use of an online anomaly detection model to facilitate the detection of issues during data-taking and decrease the workload of the control room staff. Our model is a...
Next generation high energy physics experiments face challenges with high data rates and stringent hardware constraints, driving the need for resources-efficient on-detector readout processing solutions. This work explores the novel application of embedded field programmable gate arrays (eFPGA) technology in detector readout systems. Leveraging eFPGA's unique combination of FPGA's...
The ATLAS Inner Tracker upgrade (ITk) is a silicon detector that will replace the existing Inner Detector in preparation for the HL-LHC. The subsystem of the ITk that I will be discussing is the ITk strips (more specifically ITk strips barrel) and the difficulties that have appeared in the past year of attempted production, such as module cracking. The ITk strips barrel subsystem is comprised...
Particle tracking at Large Hadron Collider (LHC) experiments is a crucial component of particle reconstruction, yet it remains one of the most computationally challenging tasks in this process. As we approach the High-Luminosity LHC era, the complexity of tracking is expected to increase significantly. Leveraging coprocessors such as GPUs presents a promising solution to the rising...
Event reconstruction and particle analyses in high-energy physics (HEP) rely on effective jet-flavour tagging. This presentation introduces a novel b-jet classification method using Graph Neural Networks (GNNs), which are adept at capturing complex relationships in graph-structured data. This is the first application of a GNN b-jet tagger at LHCb, aimed to enhance jet flavour-tagging through...
ATLAS is expected to receive 10 times the integrated luminosity from the High-Luminosity Large Hadron Collider (HL-LHC) than the previous three LHC runs combined, with approximately 200 interactions per bunch crossing, leading to significant pileup. The ATLAS Trigger and Data Acquisition system is undergoing significant upgrades to manage this pileup increase. As a part of these upgrades, the...
To handle the intense radiation at the High-Luminosity LHC, the ATLAS Liquid Argon Calorimeter readout electronics are being upgraded. The includes the production of custom ASICs, including the COLUTA chip—an 8-channel, 15-bit, 40 MSPS ADC.
The ADC meets and exceeds the specifications for the analog performance and the HL-LHC radiation tolerance. With 80,000 chips needed, robotic test stands...
The reconstruction of primary vertices will become significantly more challenging with the High Luminosity Large Hadron Collider (HL-LHC) upgrade, as the number of simultaneous collisions, or pileup, is expected to reach up to $<\mu>=200$. This high pileup places substantial computational demands on conventional combinatorics-based algorithms, resulting in significantly increased latency and...
The LHCb upgrade achieved for Run 3 includes a groundbreaking entirely software-based trigger. The removal of the hardware trigger is not only a significant technical advancement, but also enables substantial improvements in physics sensitivity. This presentation focuses on the performance of the first stage of the real-time analysis system (HLT1) running on GPUs. The flexibility provided by...
Precision measurements of Higgs boson couplings to Standard Model (SM) particles remain a central focus at the LHC and the upcoming HL-LHC. In particular, the interaction between the Higgs boson and the top quark is particularly compelling due to the large $\sim$ $O$(nb) $t\bar{t}$ cross section and $O(1)$ top-quark Yukawa coupling. The $t\bar{t}HH$ process offers a unique opportunity to probe...
The milliQan experiment searches for milli-charged particles, with electric charge O(10$^{-3}$)e or less, produced in pp collisions at the LHC. The milliQan bar detector has collected ~141 fb$^{-1}$ of data during LHC Run 3 and this presentation will focus on the detector performance, study of beam muons to calibrate the detector and the search strategy. The talk will also focus on the newly...
To mitigate high pileup conditions in the High-Luminosity Large Hadron Collider (HL-LHC), the Phase-2 upgrade to the Compact Muon Solenoid (CMS) detector will make use of tracking and high-granularity calorimeter information for the first time at the Level-1 Trigger. We focus on the barrel region (|η| < 1.5) of the electromagnetic calorimeter (ECAL) where the granularity of the ECAL barrel...
The Boosted Event Shape Tagger is a multi-class jet tagger optimized for the diverse final states inherent to all-hadronic decays of Vector-Like Quarks. Its architecture is a simple DNN whose discriminating power benefits from physics-driven observables calculated in the lab frame, but also in a series of Lorentz-boosted frames aiming to provide the network with over/rest/under-boosted frame...
We present an updated prospect study on di-Higgs production in the HH→bbγγ decay channel with the ATLAS experiment at the High Luminosity LHC (HL-LHC). The latest projections are based on extrapolating the recent legacy Run 2 ATLAS search and improve over the previous results shown at Snowmass 2022. We describe in detail the extrapolation process and assumptions, and multiple scenarios for the...
Despite extensive search efforts at the LHC, no clear evidence of physics beyond the Standard Model (BSM) has emerged. This raises the possibility that either new physics lies beyond the LHC’s reach or we are not searching in the right places. The CMS Level-1 Trigger (L1T) serves as the first step in selecting events for further analysis. If L1T algorithms fail to select events containing new...
Detectors in HL-LHC and future colliders such as the FCC will be subjected to large amounts of pileup due to increases in luminosity over LHC run 2. Disentangling pileup is critical for proper event reconstruction, thus the need arises for detectors with fine spatial granularity and picosecond level timing information. Both in-time pileup (multiple MIPs hitting the same cell during the same...
