Probing unparticle theory via lepton flavor violating process $J/\psi \to l{l}^{\prime }$ at BESIII

Zheng-Tao Wei, Ye Xu, Xue-Qian Li

The lepton flavor violating process $J/\psi \to l{l}^{\prime }(l\ne l^{\prime })$ serves as an ideal place to probe the unparticle theory. Such process can only occur at loop level in the Standard model…