Abstract
Searching for the New Physics (NP) phenomenon beyond Standard Model (SM) is still a main focus in particle physics. Here we propose to search for Λ — ⊼ oscillation in the decay J/ψ → Λ⊼ AA using BES detector. With one-year luminosity at BESIII, we can put a constraint that the Λ — ⊼ oscillation mass is smaller than 10-15 MeV at 90% confidence level, corresponding to the oscillation time of 10-6 second around, in case of non-observation of any signals. These measurements should provide very precious informations besides the neutron oscillation experiment. Also it would be the first-time access by experiment for Λ — ⊼ oscillation.
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