Abstract
Due to the finite kinetic energy in the intermediate NΔ state the (internal) energy available for mesonic decay is decreased and consequently the effective NΔ width is suppressed in NN scattering. The same can happen also in ΔΔ case. Also the NΔ angular momentum suppresses the width as well, while the effect of the initial NN angular momentum is more subtle. The state dependence affects e.g. pion production observables and can also be seen as the origin of T = 1 “dibaryons”.
Highlights
N∆ configurations arise by coupled channels in various contexts as intermediate excited states of the externally given NN states
This, in turn, causes strong state dependence to their effects [2] further conveyed to observables
It turns out that the state dependence goes into the widths giving each N∆ channel an effective width Γeff. This leads to an improved agreement with experiment in pp ↔ dπ+ [1]
Summary
N∆ configurations arise by coupled channels in various contexts (e.g. pion production and absorption) as intermediate excited states of the externally given NN states. At and above threshold the N∆ wave function is confined due to the finite pionic decay width of the ∆. In both cases the expectation value of the kinetic energy would be finite in the channel.
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