Selective background Monte Carlo simulation at Belle II

James Kahn ; Emilio Dorigatti ; Kilian Lieret ; Andreas Lindner ; Thomas Kuhr

05 November 2019
24th International Conference on Computing in High-Energy and Nuclear Physics (CHEP 2019)

Abstract: The large volume of data expected to be produced by the Belle II experiment presents the opportunity for for studies of rare, previously inaccessible processes. To investigate such rare processes in a high data volume environment necessitates a correspondingly high volume of Monte Carlo simulations to prepare analyses and gain a deep understanding of the contributing physics processes to each individual study. This resulting challenge, in terms of computing resource requirements, calls for more intelligent methods of simulation, in particular for background processes with very high rejection rates. This work presents a method of predicting in the early stages of the simulation process the likelihood of relevancy of an individual event to the target study using convolutional neural networks. The results show a robust training that is integrated natively into the existing Belle II analysis software framework, with steps taken to mitigate systematic biases induced by the early selection procedure.

Keyword(s): Data ; Belle II ; Simulation ; Experiment ; Machine learning ; Deep learning ; Neural network ; Graph neural network ; Convolutional neural network ; Rare ; Monte Carlo ; Surprise flex ; Background ; Data ; Data science ; Physics ; Flavour physics ; Luminosity ; HepSpec ; Benchmark ; Skim ; Dataset ; FEI ; Full Event Interpretation ; TDCPV ; Time dependent CP violation ; Graph ; Graph Isomorphism Network ; GIN ; GNN ; CNN ; MLP ; Feed forward ; Embedding ; Bias ; Bias quantification
Note: 15 minutes

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