Charmonium Spectroscopy (X,Y,Z) at the B Factories

TL;DR

This paper reviews the experimental discoveries of X, Y, Z charmonium-like states at B-factories, highlighting their implications for understanding conventional and exotic meson spectra.

Contribution

It provides an overview of the current experimental status of X, Y, Z states, emphasizing the challenges in interpreting these states within the traditional charmonium model.

Findings

More states observed than predicted by c c-bar spectrum

Evidence of potential exotic meson states

Discrepancies challenge conventional charmonium understanding

Abstract

Since 2003 several states in the charmonium mass region were discovered. While in the conventional c c-bar spectrum some states are missing, the number of states observed up to now is larger than empty spaces in the c c-bar spectrum. This, together with other difficulties to explain observed states as a c c-bar mesons triggered discussions on a possible exotic interpretations. In this proceedings we present current experimental status from B-factories of the so called X, Y and Z states.