The interference between virtual photon and 1-- charmonium in e+e-experiment

TL;DR

This paper reviews e+e- experiments producing charmonium, highlighting that neglecting the continuum amplitude via virtual photon can significantly impact decay results and interference effects, which are crucial for understanding various decay puzzles.

Contribution

It demonstrates that the continuum amplitude via virtual photon plays an important role and should be considered in charmonium decay analyses, a factor often overlooked in previous experiments.

Findings

Continuum amplitude contribution can significantly affect psi(2S) and psi(3770) decay results.

Interference between continuum and resonance amplitudes influences J/psi, psi(2S), and psi(3770) decays.

Considering continuum effects is essential for resolving the rho-pi puzzle and cross section differences.

Abstract

e+e- Experiments producing charmonium are reviewed. It is found that the contribution of the continuum amplitude via virtual photon was neglected in almost all the experiments and the channels analyzed. It is shown that the contribution of the continuum part may affect the final results significantly in psi(2S) and psi(3770) decays, while the interference between continuum and resonance amplitudes may even affect the J/psi decays as well as the psi(2S) and psi(3770). This should be considered in analyzing the "rho-pi puzzle" between J/psi and psi(2s) decays, and the difference between inclusive hadron and DDbar cross sections in psi(3770) decays.