Search for the rare decay $J/\psi \to \gamma D^0+c.c.$ at BESIII

TL;DR

This paper reports a search for the rare decay of J/psi into a photon and a D0 meson, using a large dataset, but finds no signal and sets an upper limit on the decay's branching fraction.

Contribution

First search for the decay $J/ar{ ext{psi}} o ext{gamma} D^0 + c.c.$ using BESIII data, establishing an upper limit on its branching fraction.

Findings

No significant signal observed.

Upper limit on branching fraction set at 9.1 x 10^{-8}.

Large dataset of over 10^8 J/psi events used.

Abstract

Using $(10087\pm44)\times10^6J/\psi$ events collected with the BESIII detector, we search for the rare decay $J/\psi \to \gamma D^0+c.c.$ for the first time. No obvious signal is observed and the upper limit on the branching fraction is determined to be ${\cal B}(J/\psi \to \gamma D^{0}+c.c.)< 9.1 \times 10^{-8}$ at 90\% confidence level.