Cross sections of e+e- --> gamma VV and e+e- --> gamma gamma V

TL;DR

This paper calculates cross sections for e+e- annihilation into a photon plus two vector mesons at different energies, aiding experimental measurements and background estimations in J/psi decay studies.

Contribution

It provides theoretical calculations of specific e+e- annihilation processes at energies relevant to B-factories and J/psi resonance, which were not previously detailed.

Findings

Cross sections for e+e- --> gamma VV at 10.58 GeV.

Cross sections for e+e- --> gamma VV and gamma gamma V at 3.097 GeV.

Estimates of background levels for J/psi decay analyses.

Abstract

Cross sections of the e+e- annihilation into one photon plus two vector mesons, such as J/psi rho, J/psi phi, and rho phi at the center of mass energy \sqrt{s}=10.58GeV are calculated. These shed light on the measurement of the e+e- annihilation cross section via radiative return in B-factories. At another center of mass energy \sqrt{s}=3.097GeV, namely the J/psi resonance peak, the processes e+e- --> gamma VV and e+e- --> gamma gamma V (with V being rho, omega, or phi) are calculated with similar method. These calculations give estimation of the background levels in the study of radiative or double radiative decays of J/psi.