Results on Charmonium(-like) and Bottomonium(-like) States from Belle and BaBar

TL;DR

This paper reports recent spectroscopy results on charmonium-like and bottomonium-like states from Belle and BaBar, focusing on the X(3872) and D-wave states, including new decay modes and production searches.

Contribution

It provides new experimental measurements of the X(3872) decays and explores D-wave assignments in bottomonium, advancing understanding of heavy quarkonium spectroscopy.

Findings

Observation of X(3872) radiative decays to J/ψγ and ψ'γ

Search for X(3872) in J/ψ3π decay mode

Confirmation of an Upsilon D-wave state

Abstract

Spectroscopy results for Belle and BaBar are reported. A particular focus is put on new results of the X(3872) state with its radiative decays to $J$/$\psi$$\gamma$ and $\psi'$$\gamma$, its decay into $J$/$\psi$3$\pi$ and the search for production in radiative Upsilon decays. Another focus is $L$=2 mesons, in particlar a possible $D$-wave assignment to the X(3872) and the confirmation of an Upsilon $D$-wave state.