Browsing by Subject "High Energy Physics"

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Access status: Open Access ,
High Energy Physics experiments in grid computing networks
(Wydawnictwa AGH, 2008) Olszewski, Andrzej
The demand for computing resources used for detector simulations and data analysis in High Energy Physics (HEP) experiments is constantly increasing due to the development of studies of rare physics processes in partide interactions. The latest generation of experiments at the newly built LHC accelerator at CERN in Geneva is planning to use computing networks for their data processing needs. A Worldwide LHC Computing Grid (WLCG) organization has been created to develop a Grid with properties matching the needs of these experiments. In this paper we present the use of Grid computing by HEP experiments and describe activities at the participating computing centers with the case of Academic Computing Center, ACK Cyfronet AGH, Kraków, Poland.
Access status: Open Access ,
Optimization of tau indentification in ATLAS experiment using multivariate tools
(Wydawnictwa AGH, 2008) Janyst, Łukasz; Kaczmarska, Anna Ewa; Szymocha, Tadeusz; Wolter, Marcin; Zemła, Andrzej
Elementary particle physics experiments, which search for very rare processes, require the efficient analysis and selection algorithms able to separate a signal from the overwhelming background. Four learning machine algorithms have been applied to identify ? leptons in the ATLAS experiment: projective likelihood estimator (LL), Probability Density Estimator with Range Searches (PDE-RS), Neural Network, and the Support Vector Machine (SVM). All four methods have similar performance, which is significantly better than the baseline cut analysis. This indicates that the achieved background rejection is close to the maximal achievable performance.