CERN Accelerating science

CERN Published Articles

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2021-02-24
06:00
Design Pattern for Analysis Automation on Distributed Resources using Luigi Analysis Workflows / Rieger, Marcel (CERN)
In particle physics, workflow management systems are primarily used as tailored solutions in dedicated areas such as Monte Carlo event generation. However, physicists performing data analyses are usually required to steer their individual workflows manually, which is time-consuming and often leads to undocumented relations between particular workloads. [...]
2020 - 7 p. - Published in : EPJ Web Conf. 245 (2020) 05025
In : 24th International Conference on Computing in High Energy and Nuclear Physics, Adelaide, Australia, 4 - 8 Nov 2019, pp.05025

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2021-02-24
06:00
Real-time data analysis model at LHC and connections to other experiments and fields / Oyanguren, Arantza (Valencia U., IFIC ; CERN)
With the upcoming increase of proton-proton collision rates at the Large Hadron Collider (LHC) experiments, and the corresponding increase of data volumes, real-time analysis becomes a key ingredient to be able to analyse and select the interesting data within the available computing resources. In this talk I will review the main features of the techniques followed by the ATLAS, CMS and LHCb experiments. [...]
2020 - 9 p. - Published in : EPJ Web Conf. 245 (2020) 11005
In : 24th International Conference on Computing in High Energy and Nuclear Physics, Adelaide, Australia, 4 - 8 Nov 2019, pp.11005

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2021-02-24
06:00
The Evolution of Analysis Models for HL-LHC / Rizzi, Andrea (INFN, Pisa ; Pisa U.)
A quick review of how analyses were and are performed at LHC in Run1 and Run2 is proposed. A discussion then follow on how this could scale and what can be improved for Run3 and for High Lumi LHC. [...]
2020 - 7 p. - Published in : EPJ Web Conf. 245 (2020) 11001
In : 24th International Conference on Computing in High Energy and Nuclear Physics, Adelaide, Australia, 4 - 8 Nov 2019, pp.11001

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2021-02-24
06:00
Let’s get our hands dirty: a comprehensive evaluation of DAQDB, key-value store for petascale hot storage / Abed Abud, Adam (CERN) ; Cicalese, Danilo (CERN) ; Jereczek, Grzegorz (IMP, Gdansk) ; Goff, Fabrice Le (CERN) ; Lehmann Miotto, Giovanna (CERN) ; Love, Jeremy (Argonne (main)) ; Maciejewski, Maciej (IMP, Gdansk) ; Mommsen, Remigius K (Fermilab) ; Radtke, Jakub (IMP, Gdansk) ; Schmiegel, Jakub (IMP, Gdansk) et al.
Data acquisition systems are a key component for successful data taking in any experiment. The DAQ is a complex distributed computing system and coordinates all operations, from the data selection stage of interesting events to storage elements. [...]
2020 - 7 p. - Published in : EPJ Web Conf. 245 (2020) 10004 Fulltext: fermilab-conf-20-637-cms - PDF; 10.1051_epjconf_202024510004 - PDF; External link: Fermilab Library Server
In : 24th International Conference on Computing in High Energy and Nuclear Physics, Adelaide, Australia, 4 - 8 Nov 2019, pp.10004

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2021-02-24
06:00
The Acts project: track reconstruction software for HL-LHC and beyond / Gessinger, Paul (CERN ; Mainz U.) ; Grasland, Hadrien (CENBG, Gradignan) ; Gray, Heather (LBL, Berkeley ; UC, Berkeley) ; Kiehn, Moritz (U. Geneva (main)) ; Klimpel, Fabian (CERN ; Tech. U., Munich (main)) ; Langenberg, Robert (CERN) ; Salzburger, Andreas (CERN) ; Schlag, Bastian (CERN ; Mainz U.) ; Zhang, Jin (ICTS, Beijing) ; Ai, Xiaocong (UC, Berkeley)
The reconstruction of trajectories of the charged particles in the tracking detectors of high energy physics (HEP) experiments is one of the most difficult and complex tasks of event reconstruction at particle colliders. As pattern recognition algorithms exhibit combinatorial scaling to high track multiplicities, they become the largest contributor to the CPU consumption within event reconstruction, particularly at current and future hadron colliders such as the LHC, HL-LHC and FCC-hh. [...]
2020 - 7 p. - Published in : EPJ Web Conf. 245 (2020) 10003
In : 24th International Conference on Computing in High Energy and Nuclear Physics, Adelaide, Australia, 4 - 8 Nov 2019, pp.10003

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2021-02-24
06:00
Towards a Turnkey Software Stack for HEP Experiments / Sailer, André (CERN) ; Ganis, Gerardo (CERN) ; Mato, Pere (CERN) ; Petrič, Marko (CERN) ; Stewart, Graeme A (CERN)
Future HEP experiments require detailed simulation and advanced reconstruction algorithms to explore the physics reach of their proposed machines and to design, optimise, and study the detector geometry and performance. To synergize the development of the CLIC and FCC software efforts, the CERN EP R&D; roadmap proposes the creation of a “Turnkey Software Stack”, which is foreseen to provide all the necessary ingredients, from simulation to analysis, for future experiments; not only CLIC and FCC, but also for proposed Super-tau-charm factories, CEPC, and ILC. [...]
2020 - 7 p. - Published in : EPJ Web Conf. 245 (2020) 10002
In : 24th International Conference on Computing in High Energy and Nuclear Physics, Adelaide, Australia, 4 - 8 Nov 2019, pp.10002

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2021-02-24
06:00
Reconstruction of track candidates at the LHC crossing rate using FPGAs / Tuci, Giulia (INFN, Pisa ; Pisa U.) ; Punzi, Giovanni (INFN, Pisa ; Pisa U.) /LHCb RTA project Collaboration
In 2021 the LHCb experiment will be upgraded, and the DAQ system will be based on full reconstruction of events, at the full LHC crossing rate. This requires an entirely new system, capable of reading out, building and reconstructing events at an average rate of 30 MHz. [...]
2020 - 7 p. - Published in : EPJ Web Conf. 245 (2020) 10001
In : 24th International Conference on Computing in High Energy and Nuclear Physics, Adelaide, Australia, 4 - 8 Nov 2019, pp.10001

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2021-02-24
06:00
Migrating Engineering Windows HPC applications to Linux HTCondor and Slurm Clusters / Alandes Pradillo, Maria (CERN) ; Høimyr, Nils (CERN) ; Sanmillan, Pablo Llopis (CERN) ; Jylhänkangas, Markus Tapani (CERN)
The CERN IT department has been maintaining different High Performance Computing (HPC) services over the past five years. While the bulk of computing facilities at CERN are running under Linux, a Windows cluster was dedicated for engineering simulations and analysis related to accelerator technology development. [...]
2020 - 9 p. - Published in : EPJ Web Conf. 245 (2020) 09016
In : 24th International Conference on Computing in High Energy and Nuclear Physics, Adelaide, Australia, 4 - 8 Nov 2019, pp.09016

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2021-02-24
04:43
Searching for lepton number violating $\Lambda$ baryon decays mediated by GeV-scale Majorana neutrino with LHCb / Zhang, Guangshuai (Peking U. ; Peking U., SKLNPT) ; Ma, Bo-Qiang (Peking U. ; Peking U., SKLNPT ; Peking U., CHEP ; CICQM, Beijing)
We consider the lepton-number-violating processes in $\Lambda_b$/$\Lambda_c$ decays mediated by on-shell GeV-scale sterile neutrino. We calculate the branching ratio for the following processes: $\Lambda_b^{0} \rightarrow \mathcal{B}^+ \mu^{-}\mu^- \pi^+$, where $\mathcal{B}^+$ is $\Lambda_c^+$ or proton, and $\Lambda_c^{+} \rightarrow \Lambda \mu^{+}\mu^+ \pi^-$, as function of the mass of the sterile neutrino $m_N$ and the heavy-light mixing coefficient of the extended Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrix $|U_{\mu N}|^2$. [...]
arXiv:2101.05566.- 2021-02-16 - 8 p. - Published in : Phys. Rev. D 103 (2021) 033004 Article from SCOAP3: PDF; Fulltext: PDF;

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2021-02-23
06:23
Status of negative momentum compaction operation at KARA / Schreiber, P (KIT, Karlsruhe) ; Boltz, T (KIT, Karlsruhe) ; Brosi, M (KIT, Karlsruhe) ; Haerer, B (KIT, Karlsruhe) ; Mochihashi, A (KIT, Karlsruhe) ; Papash, A I (KIT, Karlsruhe) ; Schuh, M (KIT, Karlsruhe) ; Müller, A -S (KIT, Karlsruhe)
For future synchrotron light sources different operation modes are of interest. Therefore various modes are currently being tested at the Karlsruhe Research Accelerator (KARA) including optics for a negative momentum compaction factor. [...]
2020 - 3 p. - Published in : CERN Yellow Rep. Conf. Proc. 9 (2020) 297-299 Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.297-299 (CERN-2020-009)

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