Effect of thresholds on the width of three-body resonances

H. Garcilazo, A. Valcarce
2017 Physics Letters B  
It has been recently reported an intriguing theoretical result of a narrow three-body resonance with a large available phase space. The resonance was reported in the NΛΛ-Ξ NN system near the Ξ d threshold, having a very small width in spite of the open NΛΛ channel lying around 23 MeV below the Ξ NN channel. We use first-order perturbation theory as a plausible argument to explain this behavior. We apply our result to realistic local interactions. Other systems involving several thresholds are likely to follow the same behavior.
doi:10.1016/j.physletb.2017.06.066 fatcat:cjin7bkqovef7ji72sotuj2dci