Exploring bosonic mediator of interaction at BESIII

Abstract

We present a comprehensive investigation on the possibility of the search for new force mediator X boson in e + e - collision and J/ ψ decay at the BESIII experiment. The typical interactions of X boson coupling to leptons and quarks are explored. The production and decay properties of this X particle, the product/decay chains e + e - → Xγ→ e + e - γ and J/ ψ→ Xγ→ μ + μ - γ, and exclusion limits on the reduced coupling strength parameters as functions of X boson mass are presented. With the data set of tens of fb-1e+e- or 1010J/ψ, we find that the exclusion limits on the coupling strength parameters fall in the range of 10 - 3 ∼ 10 - 4 , depending on m X assuming the decay width 10 eV< Γ X < 100 eV reasonably, for various hypotheses in the literature. According to our estimation, the search for new force mediator X boson in both e + e - collision and J/ ψ decay are accessible in nowadays BESIII experiment.