Speaker
Description
In most theoretical approaches to hadron resonances these states have been described as excited bound states rather than as genuine resonances taking into account their decay channels explicitly. As a result essential properties, such as the decay widths, have not been predicted strictly from quantum chromodynamics (QCD). Most of the existing results must therefore be considered as stemming from effective descriptions. The particular properties of QCD, especially the confinement, hinder a proper description of hadron resonances above all, if a relativistic treatment is required.
We shall advocate a fully Poincaré-invariant description of hadron resonances by a relativistic multi-channel constituent-quark model. Thereby it will be possible to include decay channels up to a certain threshold explicitly and thus to represent the excitations as genuine resonances. First results for decay widths and vertex form factors will be presented for $\Delta$ baryons within a coupled $\pi$-$N$-$\Delta$ system.
Details
Willibald Plessas, Institute of Phyiscs, University of Graz, Austria
| Internet talk | No |
|---|---|
| Is this an abstract from experimental collaboration? | No |
| Name of experiment and experimental site | None |
| Is the speaker for that presentation defined? | Yes |
