1,720,970 research outputs found
CMS Offline Software and Computing input to the European Strategy for Particle Physics - 2026 update
No full textThis document outlines the CMS Offline Software and Computing strategy in preparation for the High-Luminosity LHC (HL-LHC) era and serves as input to the 2026 update of the European Strategy for Particle Physics. As CMS faces a significant increase in data volume, event complexity, and computing demands in Phase-2, this report details the necessary evolution of software, computing models, infrastructure, and sustainability practices. Key developments include optimizing the CMSSW framework for heterogeneous architectures, expanding the use of AI/ML in simulation and reconstruction, adopting container-based analysis environments, and improving storage efficiency through hybrid models. The document emphasizes collaborative development across the HEP community, the need for sustainable computing aligned with environmental goals, and securing long-term resource commitments, especially from HPC centers, to ensure the success of CMSs scientific program and its broader impact on future experiments
Evolution of the CMS Computing Model towards Phase-2
No full textThe success of the physics program of the Compact Muon Solenoid (CMS) experiment critically depends on the availability of sufficient computing resources to store, process, and analyze data efficiently. The luminosity of HL-LHC and the upgraded detector promise scientific results of great impact. We describe the challenges posed by the event rates and complexity in the HL-LHC era on offline processing as well as the plans for the future computing model of the CMS experiment. We estimate the computing resources needed and provide a description of the modeling and assumptions used to determine those estimates. We also highlight the areas of research and development where we need to make investments, in particular in improving data processing applications and software related to the handling of the computing infrastructure.
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\noindent\it{N.B. This document is based on the written response of the CMS experiment to the charge of the LHCC Computing Model Review round in May 2020 and has been minimally edited for content and presentation.
CMS Phase-2 Computing Model: Update Document
No full textThe Phase-2 upgrade of CMS, coupled with the projected performance of the HL-LHC, shows great promise in terms of discovery potential. However, the increased granularity of the CMS detector and the higher complexity of the collision events generated by the accelerator pose challenges in the areas of data acquisition, processing, simulation, and analysis. These challenges cannot be solved solely by increments in the computing resources available to CMS, but must be accompanied by major improvements of the computing model and computing software tools, as well as data processing software and common software tools. In this document we present aspects of our roadmap for those improvements, focusing on the plans to reduce storage and CPU needs as well as take advantage of heterogeneous platforms, such as the ones equipped with GPUs, and High Performance Computing
Centers. We describe the most prominent research and development activities being carried out in the experiment, demonstrating their potential effectiveness in either mitigating risks or quantitatively reducing computing resource needs on the road to the HL-LHC.
\textit{N.B. This document is based on the written response of the CMS experiment to the charge of the LHCC Computing Model Review round in November 2021 and has been minimally edited for content and presentation.
A closer collaboration between HEP Experiments and HPC centers
No full textThis document offers the technical view of the CMS Experiment on the requirements and desired capabilities when planning to run its data processing workflows on HPC systems. It should serve as a help for the first handshaking with HPC sites, to understand the best direction towards a more widespread utilization of such systems for HEP processing
HPC resources integration at CMS
No full textThis document identifies minimal set of requirements on HPC based resources in order to run CMS workflows: it is meant to sketch the strategy for an effective exploitation of such machines. It describes possible ways to use HPC machines for any type of workflows, including data reconstruction and Monte Carlo digitisation and reconstruction, besides Monte Carlo generation and simulation, which would represent little value overall if considered alone. This needs the identification of the requirements in order to try to use HPC as any other traditional owned site, and thus dealing with large data input/output, stressing both storage and network
An Overview of the -Tagging Algorithms in the CMS Offline Software
No full textThe CMS Offline software contains a widespread set of algorithms to identify jets originating from the weak decay of ~quarks. Different physical properties of B~hadron decays like lifetime information, secondary vertices and soft leptons are exploited. The variety of selection algorithms range from simple and robust ones, suitable for early data-taking and online environments as the trigger system, to highly discriminating ones, exploiting all the information available. For the latter, a generic discriminator computing framework has been developed that allows to exploit the full power of multi-variate analysis techniques in a flexible way
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
PCA fitter CMSSW version for L! track Finding
No full textPCA fitter integrated into CMSSW (CMS Offline Software
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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