Bottomonium-like states: physics case for energy scan above the $B\bar{B}$ threshold at Belle-II

TL;DR

This paper advocates for an energy scan at Belle-II above the $Bar{B}$ threshold to explore bottomonium and bottomonium-like states, proposing higher energy data collection to enhance understanding of these states.

Contribution

It introduces a plan for a high-statistics energy scan above the $Bar{B}$ threshold at Belle-II to study bottomonium states and suggests increasing the maximum energy to improve research potential.

Findings

Proposal for energy scan from threshold to 12 GeV

Potential discovery of new bottomonium-like states

Enhanced understanding of bottomonium spectroscopy

Abstract

The Belle-II experiment is expected to collect large data samples at the $\Upsilon(4S)$ and $\Upsilon(5S)$ resonances to study primarily $B$ and $B_s$ mesons. We discuss what other data above the $B\bar{B}$ threshold are of interest. We propose to perform a high-statistics energy scan from the $B\bar{B}$ threshold up to the highest possible energy, and to collect data at the $\Upsilon(6S)$ and at higher mass states if they are found in the scan. We emphasize the interest in increasing the maximal energy from 11.24\,GeV to 11.5 - 12\,GeV in the future. These data are needed for investigation of bottomonium and bottomonium-like states.