The ΛΛ→YN weak transition in double-Λ hypernuclei Original Research Article

We calculate the ΛΛ→YN transition rate of 6ΛΛHe by the hybrid picture, the π and K exchanges plus the direct quark processes. It is found that the hyperon-induced decay is weaker than the nucleon-induced decay, but the former may reveal the short-range mechanism of the weak transition and also give a clear signal of the strong ΔI=3/2 transition. The ΛΛ→YN transition in double-Λ hypernucleus is complement to the ΛN→NN transition as it occurs only in the J=0 channel, while the J=1 transition is dominant in the ΛN→NN case.