Exotic and Conventional Quarkonium Physics Prospects at Belle II: Search for a Partner State to the $X(3872)$ at the $D^{*0}\bar{D}^{*0}$ threshold

TL;DR

The paper discusses the potential of Belle II to discover new exotic hadronic states, focusing on searching for a partner to the $X(3872)$ near the $D^{*0}ar{D}^{*0}$ threshold using early data.

Contribution

It introduces a search strategy for a partner state of the $X(3872)$ at the $D^{*}ar{D}^{*0}$ threshold utilizing Belle II data and tests the reconstruction of charmed mesons.

Findings

Preliminary data demonstrates successful reconstruction of charmed mesons.

The search sets the stage for discovering new exotic states at Belle II.

Data collected is sufficient for initial exploratory analyses.

Abstract

The Belle II experiment at the SuperKEKB asymmetric $e^+e^-$ collider at KEK, Tsukuba, Japan, is recording data since 2018. The expected high luminosity of $\mathcal{L}=8\cdot 10^{35}~$cm$^{-2}$s$^{-1}$ enables searches for yet unobserved exotic hadronic states in B meson decays. We describe the search for a partner state of the $X(3872)$ at the $D^{*}\bar{D}^{*0}$ threshold. The reconstruction of charmed mesons is tested with experimental data corresponding to an integrated luminosity of $504~$pb$^{-1}$ collected at the energy in the center of mass of $\Upsilon(4S)$ in 2018, and $2.62~$fb$^{-1}$ in 2019.