A unified treatment of electromagnetic decays, electroproduction, and pair production in e^+e^- annihilation for hadrons of arbitrary spin

We gather together in a unified notation formulas for electromagnetic decay rates of resonances and cross sections for electroproduction and e^+e^- annihilation for all those processes which can be expressed in terms of matrix elements of the electromagnetic current between single particle (or reson...
Ausführliche Beschreibung

We gather together in a unified notation formulas for electromagnetic decay rates of resonances and cross sections for electroproduction and e^+e^- annihilation for all those processes which can be expressed in terms of matrix elements of the electromagnetic current between single particle (or resonant) helicity states. We show in complete generality how to decompose such helicity matrix elements into form factors which are free of all kinematic singularities and constraints simultaneously at both physical thresholds, and relate them to the familiar multipole moments and to some others which have been used in data analysis. Tables are given of the form factor decomposition of the helicity matrix elements for many cases of actual and potential practical interest. Ausführliche Beschreibung