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Range extension for FASER electromagnetic calorimeter
No full textThe FASER calorimeter system has been upgraded to improve the dynamic range. The upgrade is based on the original calorimeter with only changes to the Photomultiplier Tube (PMT system). The basic concept is to introduce a light splitter between the calorimeter and the PMT: a few percent of the light is guided to one PMT (high range) while the majority of the light is guided to another PMT (low range). The splitting is selected such that the range of the PMTs has a significant overlap for cross calibration. The low range PMT is then calibrated with MIPs, while the high range PMT is cross calibrated to the low range PMT. This allows for significant dynamic range extension with a static system
Validating Geant4 and its FLUKA.CERN interface against calorimeters beam tests
No full textThe Geant4 Collaboration is leading a long-term validation program to port calorimeter test-beam simulations and results into geant-val, the Geant4 validation and testing suite. New results including Geant4 regression testing and physics list comparison are presented and discussed. Moreover, the new Geant4-to-FLUKA.CERN interface recently allowed detailed comparisons between the hadronic models in Geant4 and the FLUKA.CERN Monte Carlo codes. The interface is described and some geant-val results obtained with it are presented here for the first time
EOS 2025 Workshop
No full textThis presentation will report about the benchmarking results of various EOS setups at CERN using the new RNTuple framework
EOS 2025 Workshop
No full textWe will outline the EOS development roadmap, highlighting key milestones, upcoming features, and future plans. This presentation will provide insights into ongoing improvements, strategic goals, and the evolving direction of EOS
Analysis of AFP ToF data from early LHC Run-3
No full textThe analysis of the early LHC Run-3 data was performed. Efficiencies 7 for the ATLAS Forward Proton (AFP) Time-of-Flight (ToF) detector were 8 studied. In addition, these performance studies of the ToF data included 9 the proton-proton vertex reconstruction using matching of ToF and cen10 tral ATLAS vertex position. After a calibration, a preliminary resolution 11 of the vertex reconstruction was determined with a low-mu ATLAS run
Early Career Researcher Input to the European Strategy for Particle Physics Update: White Paper
No full textThis document, written by early career researchers (ECRs) in particle physics, aims to represent the perspectives of the European ECR community and serves as input for the 2025--2026 update of the European Strategy for Particle Physics. With input from a community-wide survey, it highlights key challenges faced by ECRs -- career stability, funding access and long-term research opportunities -- while proposing policy recommendations and targeted initiatives. It underscores the importance of practices fostering diverse, equitable, inclusive and healthy workplaces, as well as of stronger ECR communities, and highlights how effective communication and interdisciplinary collaborations reinforce the societal relevance of particle physics and promote continued support for large-scale and long-term projects. Finally, the future of both collider and beyond-collider experiments is addressed, emphasising the critical role of ECRs in shaping future projects. The ECR contribution is formed of two parts: the ten-page executive summary submitted as input to the European Strategy for Particle Physics Update and, as backup document, this extended white paper providing additional context
Production and Nuclear modification factor measurement of in heavy ion collisions at 5.02 TeV with CMS experiment
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Inverted CERN School of Computing 2025
No full textIn high-energy physics (HEP), efficient workflow management is crucial for processing large datasets, running simulations, and managing computational jobs across distributed environments. This lecture introduces Luigi, a workflow management tool originally developed at Spotify that helps automate and scale complex task pipelines, ensuring dependency resolution and fault tolerance.
Building on Luigi, Law (**L**uigi **a**nalysis **w**orkflow) provides additional abstractions for HEP workflows by incorporating diverse batch job submission systems, like HTCondor, and different execution environments. Additionally, the automatic management of accessing distributed storage locations using the standard WLCG transfer protocols (e.g., WebDAV and XRootD) enables seamless execution of tasks across remote computing resources and ensures efficient resource utilization, simplifying the life of physicists a lot.
The lecture will provide both conceptual insights and practical approaches for managing large-scale workflows in HEP, leveraging modern tools and distributed computing infrastructure to enhance scientific computing.
Specifically, it will cover how Luigi and law can be used to construct robust and scalable workflows for HEP applications, from running jobs on distributed batch systems to automatically managing remote data access to conduct complex analyses
Measurements of higher-order cumulants of multiplicity and net-electric charge distributions in inelastic proton-proton interactions by NA61/SHINE
No full textThis paper presents the energy dependence of multiplicity and net-electric charge fluctuations in interactions at beam momenta 20, 31, 40, 80 and 158 GeV/. Results are corrected for the experimental biases and quantified with the use of cumulants and factorial cumulants. Data are compared with the EPOS and FTFP-BERT model predictions