Belle II Executive Summary

TL;DR

Belle II is a large-scale experiment at SuperKEKB aiming to collect extensive data on B mesons, charm hadrons, and tau leptons to explore flavor physics and search for physics beyond the Standard Model with high precision.

Contribution

This paper summarizes the Belle II experiment's goals, capabilities, and its potential to perform groundbreaking measurements in flavor physics and beyond Standard Model searches.

Findings

Expected to record 50 ab$^{-1}$ of data by 2035

Will provide high-precision measurements of CKM parameters

Searches for lepton-flavor violation and dark matter events

Abstract

Belle II is a Super $B$ Factory experiment, expected to record 50 ab$^{-1}$ of $e^+e^-$ collisions at the SuperKEKB accelerator until 2035. The large samples of $B$ mesons, charm hadrons, and tau leptons produced in the clean experimental environment of $e^+e^-$ collisions will provide the basis of a broad and unique flavor-physics program. Belle II will pursue physics beyond the Standard Model in many ways, for example: improving the precision of weak interaction parameters, particularly Cabibbo-Kobayashi-Maskawa (CKM) matrix elements and phases, and thus more rigorously test the CKM paradigm, measuring lepton-flavor-violating parameters, and performing unique searches for missing-mass dark matter events. Many key measurements will be made with world-leading precision.