This paper presents a covariant tensor formalism for partial-wave amplitudes of resonances decaying to four pseudoscalar mesons, covering two-resonance and cascade topologies.
Partial wave decomposition of pion and photoproduction amplitudes
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abstract
Partial wave amplitudes for production and decay of baryon resonances are constructed in the framework of the operator expansion method. The approach is fully relativistically invariant and allow us to perform combined analyses of different reactions imposing directly analyticity and unitarity constraints. All formulas are given explicitly in the form used by the Crystal Barrel collaboration in the (partly forthcoming) analyses of the electro-, photo- and pion induced meson production data.
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Partial wave analysis of reactions with four meson final states
This paper presents a covariant tensor formalism for partial-wave amplitudes of resonances decaying to four pseudoscalar mesons, covering two-resonance and cascade topologies.