Improved Selective Background Monte Carlo Simulation at Belle II with Graph Attention Networks and Weighted Events

Boyang Yu

24 October 2022
ACAT 2022

Abstract: When measuring rare processes at Belle II, a huge luminosity is required, which means a large number of simulations are necessary to determine signal efficiencies and background contributions. However, this process demands high computation costs while most of the simulated data, in particular in case of background, are discarded by the event selection. Thus filters using graph neural networks are introduced at an early stage to save the resources for the detector simulation and reconstruction of events discarded at analysis level. In our work, we improved the performance of the filters using graph attention and invested statistical methods including sampling and reweighting to deal with biases introduced by the filtering.

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 Record created 2022-10-14, last modified 2022-10-14

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