The Belle II Upgrade Program

TL;DR

The Belle II upgrade program aims to enhance the detector and accelerator to achieve higher luminosity and data collection, enabling advanced physics research with ongoing development and future upgrade plans.

Contribution

This paper provides a comprehensive overview of the Belle II upgrade project, including current status, planned upgrades, motivations, and future opportunities.

Findings

Progress towards design luminosity is ongoing.

Multiple upgrade options are being considered and developed.

The project aims to collect 50 ab$^{-1}$ of data for physics research.

Abstract

The Belle II detector at the SuperKEKB accelerator complex is covering a wide range of exciting physics topics. To achieve the project's research goals, a substantial increase of the data sample to 50~ab$^{-1}$ is needed, and for that, the luminosity has to reach the ambitious goal of $6 \times 10^{35}$ cm$^{-2}$ s$^{-1}$. The progress towards the design luminosity is accompanied by research and development of the accelerator, detector components, operation methods, as well as their upgrades. In the present contribution, we will discuss the status and plans of the project, timescales for upgrades, their motivations, and opportunities, an overview of upgrade options, and finish with an outlook and perspectives.