Low-energy scattering from a pole-enhanced triangle diagram
arXiv:2601.06804 · doi:10.1016/j.physletb.2026.140336
Abstract
We investigate low-energy scattering driven by a pole-enhanced triangle-like diagram, in which the two-Kaon-exchange contribution is promoted by the near-threshold pole in the subsystem. Using an unphysical Kaon mass motivated by lattice simulations, we evaluate the scattering length and find that this mechanism generates an attractive interaction with a magnitude of to . Spin-dependent effects are not treated explicitly and are expected to provide subleading corrections in the near-threshold region. We further analyze the low-energy behavior of the triangle-like diagram amplitude and show that the scattering length depends on the parameter , defined as the mass difference between the threshold and the meson, and the pole position of , where the plays a crucial role to understand interaction. Furthermore, by employing physical hadron masses, our calculated scattering length is found to be consistent with current experimental data, providing a unified description across both unphysical and physical mass regimes. This type of interaction differs from that associated with van der Waals-type forces or the long-range tail of two-pion exchange, highlighting the role of three-body dynamics encoded in the pole-enhanced triangle-like diagram in shaping the near-threshold interaction.
arXiv comment11 pages, 9 figures
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