2011

Commentary on rainbow-ladder truncation for excited states and exotics

Qin, Si-xue, Chang, Lei, Liu, Yu-xin et al.

Understand

Ground-state, radially-excited and exotic scalar-, vector- and flavoured-pseudoscalar-mesons are studied in rainbow-ladder truncation using an interaction kernel that is consonant with modern DSE- and lattice-QCD results.

The inability of this truncation to provide realistic predictions for the masses of excited- and exotic-states is confirmed and explained.
On the other hand, its application does provide information that is potentially useful in proceeding beyond this leading-order truncation, e.g.: assisting with development of projection techniques that ease the computation of excited state properties; placing qualitative constraints on the long-range behaviour of the interaction kernel; and highlighting and illustrating some features of hadron observables that do not depend on details of the dynamics.

Built on

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