1. Bound states from the spectral Bethe-Salpeter equation
- Author
-
Eichmann, Gernot, Gómez, Andrés, Horak, Jan, Pawlowski, Jan M., Wessely, Jonas, and Wink, Nicolas
- Subjects
High Energy Physics - Phenomenology ,High Energy Physics - Theory - Abstract
We compute the bound state properties of three-dimensional scalar $\phi^4$ theory in the broken phase. To this end, we extend the recently developed technique of spectral Dyson-Schwinger equations to solve the Bethe-Salpeter equation and determine the bound state spectrum. We employ consistent truncations for the two-, three- and four-point functions of the theory that recover the scaling properties in the infinite coupling limit. Our result for the mass of the lowest-lying bound state in this limit agrees very well with lattice determinations., Comment: 15 pages, 16 figures
- Published
- 2023