SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 10: ML Methods I

T 10.5: Vortrag

Montag, 20. März 2023, 17:30–17:45, HSZ/0405

Reconstruction of Full Decays using Transformers and Hyperbolic Embedding at Belle II — •Boyang Yu, Hosein Hashemi, Nikolai Hartmann, and Thomas Kuhr — Ludwig-Maximilians-Universität München

In analyses at Belle II, it is often helpful to reconstruct the whole decay process of each electron-positron collision event using the information collected from detectors. The reconstruction is composed of several steps which require manual configurations and suffers from high uncertainty as well as low efficiency.

In this project, we are developing a software with the aim to reconstruct B decays at Belle II automatically with both high efficiency and high accuracy. The well trained models should be tolerant to rare decays that have very small branching ratio or are even unseen during the training.

To ensure high performance, the project is separated into several stages: particle level embedding, event level embedding and decay reconstruction. Inspired by the recent achievements in computer science, transformers and hyperbolic embedding are employed as building blocks with pre-training-fine-tuning framework, contrastive metric learning and knowledge transfer serving as training tools.