The role of the next-to-leading order triangle-shaped diagram in two-body hadronic decays
arXiv:1407.7414 · doi:10.1016/j.nuclphysb.2014.10.003
Abstract
The next-to-leading-order contribution to the amplitude of a two-body decay process is a triangle-shaped diagram in which the unstable state is exchanged by the emitted particles. In this work we calculate this diagram in the framework of a scalar quantum field theory and we estimate its role in hadronic physics, i.e., we apply our results to the well-known scalar-isoscalar resonances , , , , and the scalar-isovector resonance . It turns out that, with the exception of the broad resonance , the next-to-leading-order contribution is small and can be neglected.
18 pages, 6 figures, 1 table
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