A very broad X(4260) and the resonance parameters of the 3D vector charmonium state

TL;DR

This paper analyzes the broad X(4260) enhancement in e+e- collisions, revealing its complex structure and proposing new insights into vector charmonium states, including estimates for the psi(3D) resonance parameters.

Contribution

It provides a detailed analysis of the X(4260) shape, suggesting it contains information about vector c-cbar spectroscopy and estimating parameters for the psi(3D) state.

Findings

X(4260) is a broad structure not fitting traditional vector charmonium

The shape reveals potential new vector c-cbar states

Estimated resonance parameters for psi(3D)

Abstract

We argue that the X(4260) enhancement contains a wealth of information on vector c-cbar spectroscopy. We discuss the shape of the X(4260) observed in the OZI-forbidden process "electron-positron into J/psi and a pair of charged pions", in particular at and near vector charmonium resonances as well as open-charm threshold enhancements. The resulting very broad X(4260) structure does not seem to classify itself as a vector charmonium resonance, but its detailed shape allows to identify new vector c-cbar states. Here, we estimate the resonance parameters of the psi(3D) state.