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1	Investigations of calorimeter clustering in ATLAS using machine learning Niedermayer, Graeme 11 January 2018 (has links) The Large Hadron Collider (LHC) at CERN is designed to search for new physics by colliding protons with a center-of-mass energy of 13 TeV. The ATLAS detector is a multipurpose particle detector built to record these proton-proton collisions. In order to improve sensitivity to new physics at the LHC, luminosity increases are planned for 2018 and beyond. With this greater luminosity comes an increase in the number of simultaneous proton-proton collisions per bunch crossing (pile-up). This extra pile-up has adverse effects on algorithms for clustering the ATLAS detector's calorimeter cells. These adverse effects stem from overlapping energy deposits originating from distinct particles and could lead to difficulties in accurately reconstructing events. Machine learning algorithms provide a new tool that has potential to improve clustering performance. Recent developments in computer science have given rise to new set of machine learning algorithms that, in many circumstances, out-perform more conventional algorithms. One of these algorithms, convolutional neural networks, has been shown to have impressive performance when identifying objects in 2d or 3d arrays. This thesis will develop a convolutional neural network model for calorimeter cell clustering and compare it to the standard ATLAS clustering algorithm. / Graduate Machine Learning Artificial Neural Network Convolutional Neural Network Calorimetry Particle Physics ATLAS LHC ANN CNN Topological Clustering Particle Detector CERN Energy Depositions Pile-Up High Luminosity Residual Neural Network Large Hadron Collider HL-LHC

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Investigations of calorimeter clustering in ATLAS using machine learning