The Full Event Interpretation -- An exclusive tagging algorithm for the Belle II experiment

TL;DR

The paper introduces the Full Event Interpretation, a machine learning-based exclusive tagging algorithm for Belle II that enhances the efficiency of identifying B meson decay modes, enabling more precise high-energy physics measurements.

Contribution

It presents a novel exclusive tagging algorithm that improves efficiency over previous methods, facilitating better measurements of B meson decays at Belle II.

Findings

Higher tagging efficiency compared to previous algorithms

Enables access to previously inaccessible B meson decay modes

Increases effective sample size for physics analyses

Abstract

The Full Event Interpretation is presented: a new exclusive tagging algorithm used by the high-energy physics experiment Belle II. The experimental setup of Belle II allows the precise measurement of otherwise inaccessible $B$ meson decay-modes. The Full Event Interpretation algorithm enables many of these measurements. The algorithm relies on machine learning to automatically identify plausible $B$ meson decay chains based on the data recorded by the detector. Compared to similar algorithms employed by previous experiments, the Full Event Interpretation provides a greater efficiency, yielding a larger effective sample size usable in the measurement.