International Linear Collider
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User guide through Resolution Function class
No full textThis guide provides the instructions for using a C++ class implementing a parameterization of the resolution function for the first experimental area (EAR1) of the n_TOF facility, from the third phase (Phase-3) of its operation
Observation of magic states of top quark pairs produced in proton-proton collisions at
No full textAn observation of magic states of top quark-antiquark () systems produced in proton-proton collisions at the LHC at is presented. Magic, defined here using the second stabilizer Rnyi entropy, is an important property used to characterize quantum states in quantum information science. Quantum states with high magic provide computational advantage over classical systems. This observation is based on measurements of the polarization and spin correlation coefficients in systems using the final states with an electron or muon and jets. Magic is determined in various kinematic regions of the system and is found to agree with the standard model predictions. This study represents the first experimental measurement of this quantity at the TeV energy scale
Tuning the CMS Coffea-casa facility for 200 Gbps Challenge
No full textAs a part of the IRIS-HEP "Analysis Grand Challenge" activities, the Coffea-casa AF team executed a "200 Gbps Challenge". One of the goals of this challenge was to provide a setup for execution of a test notebook-style analysis on the facility that could process a 200 TB CMS NanoAOD dataset in 20 minutes. We describe the solutions we deployed at the facility to execute the challenge tasks. The facility was configured to provide 2000+ cores for quick turn-around, low-latency analysis. To reach the highest event processing rates we tested different scaling backends, both scaling over HTCondor and Kubernetes resources and using Dask and Taskvine schedulers. This configuration also allowed us to compare two different services for managing Dask clusters, Dask labextention, and Dask Gateway server, under extreme conditions. A robust set of XCache servers with a redirector were deployed in Kubernetes to cache the dataset to minimize wide-area network traffic. The XCache servers were backed with solid-state NVME drives deployed within the Kubernetes cluster nodes. All data access was authenticated using scitokens and was transparent to the user. To ensure we could track and measure data throughput precisely, we used our existing Prometheus monitoring stack to monitor the XCache pod throughput on the Kubernetes network layer. Using the rate query across all of the 8 XCache pods we were able to view a stacked cumulative graph of the total throughput for each XCache. This monitoring setup allowed us to ensure uniform data rates across all nodes while verifying we had reached the 200 Gbps benchmark
Preliminary Design Considerations for the Forward Liquid Argon detector (FLArE) at the high luminosity LHC
No full textThis technical note describes the current status of the technical design and optimization of the FLArE detector in the Forward Physics Facility (FPF). It is a working document that summarizes the current studies including possible improvements and future items to investigate. This note should serve as the main reference to outline the contents already available or that need to be completed towards a conceptual design report. The note provides the scientific and technical requirements along with engineering constraints that have led to the current conceptual design. Some of the major design features have options that need to be investigated further. The note concludes with a preliminary summary of the core costs and labor estimates for constructing this detector. This note is accompanied by a separate note on simulation studies of FLArE and the FPF
Progress on Detector R&D for CLIC 2019–2025
No full textStringent requirements are imposed on the CLIC detector technologies, addressed by broad and ambitious R&D programs exploiting synergies with other projects and progress in technologies available from industry. This note summarizes the evolution since the 2019 update of the European Strategy for Particle Physics, with a focus on the most critical sub-detector systems. The impact of an improved machine design for the initial 380 GeV accelerator stage on the detector is also discussed
EOS 2025 Workshop
No full textWe will give an overview of new features for storage tiering in EOS version 5.
FCC-ee Collider Design Overview
No full textIn response to the directives of the 2020 European Strategy for Particle Physics (ESPP), CERN, in collaboration with international partners, is exploring the feasibility of an energy-frontier, 100 TeV hadron collider, including, as an initial stage, a high-luminosity circular electron-positron collider serving as Higgs and electroweak factory.This effort builds upon the 2019 conceptual design reports of the Future Circular Collider (FCC) study. Currently, the FCC Feasibility Study, spanning over five years, aims at providing conclusive inputs to the next update of the ESPP, with a focus on implementing these accelerators inside a 90.7 km tunnel in the Lake Geneva basin.The ongoing study aims at validating tunnel construction, refine collider and injector designs, develop organization and funding models, and conduct R&D; on critical machine components. This paper provides an overview of the study status and the latest advancements on the electron-positron collider FCC-ee