What is the right formalism to search for resonances? II. The pentaquark chain

Abstract

We discuss the differences between several partial-wave analysis formalisms used in the construction of three-body decay amplitudes involving fermions. Specifically, we consider the decay Lambda_b -> psi p K- , where the hidden charm pentaquark signal has been reported. We analyze the analytical properties of the amplitudes and separate kinematical and dynamical singularities. The result is an amplitude with the minimal energy dependence compatible with the S-matrix principles.

arXiv comment30 pages, 4 figures. Added one section about MacDowell symmetry. Few other references added

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Cited by in corpus (8)

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• Dalitz-plot decomposition for three-body decays
• Khuri-Treiman equations for $3\pi$ decays of particles with spin
• The effective radius for production of baryon-antibaryon pairs from $\psi$ decays
• Spin-orbit amplitudes for decays with arbitrary spin
• Wigner rotations for cascade reactions