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Design and Development of ATLAS L0 Muon Endcap Control Software on Zynq MPSoC
No full textThe L0 Muon Endcap Sector Logic for Phase‐2 upgrade integrates Zynq Ultrascale+ MPSoC with Virtex Ultrascale+ FPGA, interconnected via AXI Chip2Chip. In terms of control and monitoring functionality, the Zynq MPSoC is responsible for the monitoring and control of the ATLAS TGC system through communication with the Virtex FPGA, which provides optical interfaces for approximately 30 front end boards. To implement this functionality, we are developing a comprehensive control software stack on the MPSoC. This stack comprises low‐level APIs for accessing onboard devices and front end boards, as well as high‐level APIs for TDAQ and DCS. The low‐level APIs are implemented in Rust to leverage its robust and expressive type system for enforcing compile‐time access guarantees, while the high‐level layer employs DAQ2SoC as a proposed approach to communicate with ATLAS Run Control applications and DCS. In this presentation, we will present the development of this system as an example of a complete system implementation, sharing insights and experiences gained during the process
Development of secondary vertex reconstruction using tracks in the ATLAS Muon Spectrometer for long-lived particle decays
No full textMany promising beyond the Standard Model (BSM) theories predict invisible long-lived particles (LLPs) that travel macroscopic distances before decaying into visible Standard Model (SM) particles with a common spatial origin. Fast and accurate reconstruction of secondary vertices therefore plays a central role in ATLAS LLP searches. While significant advancements have been made in efficiently reconstructing Inner Detector (ID) tracks originating far from the primary Interaction Point (IP), traditional secondary vertexing algorithms still remain limited by the ID track reconstruction acceptance, significantly reducing sensitivity to LLP phase space where the bulk of expected decays lie beyond the Pixel detector. This note describes a novel secondary vertexing technique that leverages StandAlone muon tracks reconstructed exclusively in the ATLAS Muon Spectrometer (MS), which demonstrates the ability to efficiently reconstruct ultra-displaced dimuon vertices up to 8 meters from the IP. Its performance is characterized on a range of simulated BSM signatures and in Run 3 data through a tag-and-probe approach using J/ decays
Towards a topological data analysis for heavy-ion collisions
No full textThe collective expansion of the quark-gluon plasma (QGP) created in heavy-ion collisions suggests that geometry-inspired approaches can be useful in extracting information about the QGP. In this work, a systematic study of observables based on topological data analysis is provided for simulations of heavy-ion collisions. Specifically, we implement persistent homology observables for metric-based complexes in the heavy-ion model trajectum and provide predictions for Pb-Pb and O-O collisions, where the tunable model parameters are taken from a Bayesian analysis performed in Pb-Pb collisions. This, in particular, allows us to compute systematic uncertainties on our observables from the uncertainties in the model parameters. To bridge between new and already established observables, we build a dictionary linking the topological observables to traditional ones, such as particle multiplicities, momentum distributions, and the elliptic flow coefficient. While the persistent homology observables largely reflect known phenomenology and do not show enhanced sensitivity to the model's tunable parameters compared to conventional observables, this study demonstrates the viability and robustness of topological techniques in the context of heavy-ion physics. They may offer alternative perspectives and potential applications in heavy-ion physics.The collective expansion of the quark-gluon plasma (QGP) created in heavy-ion collisions suggests that geometry-inspired approaches can be useful in extracting information about the QGP. In this work, a systematic study of observables based on topological data analysis is provided for simulations of heavy-ion collisions. Specifically, we implement persistent homology observables for metric-based complexes in the heavy-ion model Trajectum and provide predictions for Pb-Pb and O-O collisions, where the tunable model parameters are taken from a Bayesian analysis performed in Pb-Pb collisions. This, in particular, allows us to compute systematic uncertainties on our observables from the uncertainties in the model parameters. To bridge between new and already established observables, we build a dictionary linking the topological observables to traditional ones, such as particle multiplicities, momentum distributions, and the elliptic flow coefficient. While the persistent homology observables largely reflect known phenomenology and do not show enhanced sensitivity to the model's tunable parameters compared to conventional observables, this study demonstrates the viability and robustness of topological techniques in the context of heavy-ion physics. They may offer alternative perspectives and potential applications in heavy-ion physics
opbasis - a Python package to derive minimal operator bases
No full textFinding a complete and yet minimal on-shell basis of operators of a given mass-dimension that are compatible with a specific set of transformation properties is the first step in any Effective Field Theory description. This step is the main bottleneck for systematic studies of leading logarithmic corrections to integer-power lattice artifacts in Symanzik Effective Field Theory targeting various local fields and lattice actions. The focus on discrete symmetry transformations in lattice field theory, especially reduced hypercubic spacetime symmetry with Euclidean signature, complicates the use of standard continuum field theory tools. Here, a new Python package is being presented that targets the typical lattice field-theorist's use cases. While the main target lies on continuum EFTs describing 4D non-Abelian lattice gauge theories, the applicability can be extended beyond Effective Field Theories. New discrete symmetries, twisted masses, or the introduction of boosts are just a few examples of possible extensions that can be easily implemented by the user. This should allow for a wider range of theories and applications beyond the initial focus of this package. The general functionality of the package is explained along the lines of three examples: The operator basis of the axial-vector in Wilson QCD, operator bases compatible with the symmetries of unrooted Staggered quarks as well as a pedestrian derivation of a operator with pseudo-scalar quantum numbers. Each example makes use of an increasing range of features and requires user-defined extensions show-casing the versatility of the package
Elusive romance of top-quark pairs observed at the LHC
No full textThe CMS and ATLAS experiments at CERN’s Large Hadron Collider have observed an unforeseen feature in the behaviour of top quarks that suggests that these heaviest of all elementary particles form a fleeting unio
Towards a Modelling Uncertainty Prescription for the ATLAS Monte Carlo sample
No full textWith the increasing experimental precision achieved in top quark physics, modelling uncertainties have become a dominant contribution to the total uncertainty of many measurements. Therefore it is necessary to incorporate recent theoretical advances. One major improvements over the current nominal ATLAS Powheg+Pythia8 sample is available through the Powheg process, which incorporates the correct treatment of off-shell top-quarks and interference. Uncertainties related to these effects can be dominant in the prediction, especially for extreme but interesting phase spaces as e.g. the high region, which is often used as a proxy for the invariant mass of the top-quark. To profit from these improvements in physics analyses, a complete recipe of the systematic uncertainties needs to be present for the sample. Studies towards the systematic uncertainty prescription for the sample at TeV will be presented, in particular the comparison to the DR Powheg+Pythia8 samples as well as the study of the variation of Powheg and Pythia8 parton-shower parameters related to the matching of the hard-process events to the parton shower
Recent results in t-channel single top production
No full textOverview talk of recent ATLAS results in t-channel single top production at the LHC top WG meeting frim 5-7th November
Preliminary tracking studies involving FPGA accelerators for the ATLAS Event Filter at the HL-LHC
No full textAs part of the ATLAS TDAQ Phase-II upgrade project, the Event Filter Tracking system will allow online tracking for the trigger of the ATLAS experiment in the HL-LHC era. While the system is still under design, this note presents an overview of how FPGA accelerators are envisioned to be potentially used for online track reconstruction. The current preliminary tracking performance of the different options is being compared with the full offline track reconstruction using the new Inner Tracker. It should be noted, that this note represents R&D and not official ATLAS Trigger strategy
1st FCC-ee TDAQ Workshop
No full textOverview of DRD7 developments underway, focusing on those that are targeted at / of great relevance to FCCee usag