Recent spectroscopy studies at Belle

TL;DR

This paper reviews recent spectroscopy studies at Belle, focusing on exotic states, cross-section measurements, and potential confirmations of LHCb findings using Belle's full data set.

Contribution

It presents new analyses of various e+e- collision processes and cross-section measurements, expanding understanding of exotic states and charmonium-like structures.

Findings

Measurement of cross-sections for multiple e+e- processes.

Investigation of possible confirmation of LHCb states.

Analysis of double charmonium and D_s-related processes.

Abstract

The analyses of states with double $cs$ content and the search for exotics have recently gained much attention. The Belle experiment collected roughly 1 ab$^{-1}$ integrated luminosity data. While Belle II data-taking is in progress, we have performed a new search for exotic states and cross-section measurements with the full Belle data sets. Here we review the recent analysis of: (a) $e^+e^-\to D_s^{(*)+}+D_{sJ}^-$ + $c.c$. from both $\Upsilon(2S)$ decays and continuum production at 10.52 GeV, using the Belle detector at KEKB; (b) the analysis of $e^+e^- \to \eta_c J/\psi$ + $c.c.$ and search for double charmonium states; (c) the study of $e^+e^- \to D_s^+D_{s0}(2317)^-$ + $c.c.$ and $e^+e^- \to D_s^+D_{s1}(2460)^-$ + $c.c.$ + anything else, in the continuum. Born cross-sections are evaluated, and a possible confirmation of the states seen in the invariant mass system of $J/\psi\phi$ by LHCb in $B$ decays has been investigated.