The physical meaning of scattering matrix singularities in coupled-channel formalisms

Abstract

The physical meaning of bare and dressed scattering matrix singularities has been investigated. Special attention has been attributed to the role of well known invariance of scattering matrix with respect to the field transformation of the effective Lagrangian. Examples of evaluating bare and dressed quantities in various models are given.

14 pages, Summary of the BRAG2007 workshop

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• A systematic study of longitudinal and transverse helicity amplidutes in the hypercentral Constituent Quark Model
• Electroproduction of the Roper resonance on the proton: the role of the three-quark core and the molecular N-sigma component
• Study of $\eta$ photoproduction on the proton in a chiral constituent quark approach via one-gluon-exchange model
• Electromagnetic Transition Form Factors of Baryon Resonances
• Using the Single Quark Transition Model to predict nucleon resonance amplitudes
• Remarks on meson loop effects on quark models
• Configuration Mixing of Quark States in Baryons
• Decaying hadrons within constituent-quark models