학술논문
What is the right formalism to search for resonances? II. The pentaquark chain
Document Type
article
Author
Source
European Physical Journal C: Particles and Fields, Vol 78, Iss 9, Pp 1-25 (2018)
Subject
Language
English
ISSN
1434-6044
1434-6052
1434-6052
Abstract
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 $$\Lambda _b \rightarrow \psi \,p K^-$$ Λb→ψpK- , 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.