Belle II early physics program of bottomonium spectroscopy

Understand

The Belle II experiment at the SuperKEKB collider is a major upgrade of the KEK "$B$ factory" facility in Tsukuba, Japan.

• Phase 1 commissioning of the main ring of SuperKEKB has started in February 2016 and first physics data will be recorded in 2017 during the so-called Phase 2 commissioning, when the partial Belle II detector will be operated still without its vertex detector.
• In 2018, the full Belle II detector will be rolled in and physics run will start.
• In this proceeding, a possible physics program for this early data run at different center-of-mass energies is described, in particular at the $\Upsilon(3S)$ and $\Upsilon(6S)$ resonances, amongst other energy points.