Analysis of J/ψ(ηc)→ γ + invisible decays in the standard model

الأصل · EN

Motivated by the experimental study of J/ψ→γ + invisible decay by the CLEO Collaboration, we analyze the process J/ψ→ γνν, as the standard model background for this invisible decay, at the lowest order. Our investigation shows that Br(J/ψ→ γνν) is far below the present experimental upper limit on the branching ratio of J/ψ→γ + invisible, which indicates that some interesting room for new physics in this channel might be expected. We also present a similar analysis of the ηc→ γνν decay.