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Unitarity of the infinite-volume three-particle scattering amplitude arising from a finite-volume formalism

2019
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Physical Review D
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In a previous publication, two of us derived a relation between the scattering amplitude of three identical bosons, $\mathcal M_3$, and a real function referred to as the {divergence-free} K matrix and denoted $\mathcal K_{\text{df},3}$. The result arose in the context of a relation between finite-volume energies and $\mathcal K_{\text{df},3}$, derived to all orders in the perturbative expansion of a generic low-energy effective field theory. In this work we set aside the role of the finite

doi:10.1103/physrevd.100.054508
fatcat:ukddxtlw2zfajiszsk3e2afwge