Study of the rare decay $J/\psi \to 2\gamma +hadrons$ at the BESIII

Abstract

Two-photon radiative decay process $J/\psi \to 2\gamma +hadrons$ is studied, and the main contribution processes $J/\psi \to 2\gamma +ggg$ and $J/\psi \to 2\gamma +q\bar{q}$ are calculated. With the specific condition at the BESIII, this rare decay process and the main background process $e^{+}{e}^{-}\to \gamma \gamma +hadrons(q\bar{q})$ are investigated. The results show that the ratio of signal to background can reach 1.24 with the optimized selection criteria at the BESIII. In addition, a few distributions of the signal and background are presented. All the results show that the signal is large enough to be measured in the experiment.

Comments: 10 pages, 19 figures