出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：In relativistic frameworks, given by the Bethe–Salpeter and light-front bound state equations, the
binding energies of system of three scalar particles interacting by scalar exchange particles are
calculated. In contrast to two-body systems, the three-body binding energies obtained in these
two approaches differ significantly from each other: the ladder kernel in light-front dynamics
underbinds by approximately a factor of two compared to the ladder Bethe–Salpeter equation.
By taking into account three-body forces in the light-front approach, generated by two exchange
particles in flight, we find that most of this difference disappears; for small exchange masses, the
obtained binding energies coincide with each other.
