Width of N Δ and Δ Δ states

It is seen by a coupled-channel N N scattering calculation that in the intermediate two-baryon N Δ or Δ Δ system the width of the state is greatly diminished due to the relative kinetic energy of the two baryons, since the internal energy of the particles, available for pionic decay, is smaller. Specifically, a state-dependent effect arises from the centrifugal barrier in L ≠0 N Δ or Δ Δ systems. The double Δ width can become even smaller than the free width of a single Δ . This has some bearing to the interpretation of the d^'(2380 ) resonance recently discovered at COSY.