Constraining the three-body bound state via the pole
arXiv:2412.12816 · doi:10.1103/PhysRevD.111.094022
Abstract
In this study, we propose using the pole position to constrain the existence of the three-body bound state within the one-boson-exchange (OBE) model. The existence of the bound state remains uncertain due to significant variations in the OBE interaction, particularly in the strength of scalar-meson-exchange interactions, which can differ by a factor about 20 between two commonly used OBE models. This discrepancy renders the system highly model-dependent. To address this issue, we constrain the scalar-meson-exchange interaction using the pole position, where the pseudoscalar-meson coupling is well-determined, and the - and -exchange interactions nearly cancel each other out, leaving the coupling constant of the -exchange as the only unknown parameter. Our results indicate that the isospin- bound states exist when is a virtual state of located within approximately MeV of the threshold. However, the three-body bound state is gone when the virtual state pole is more than MeV away from the threshold. Each experimental progress, either on the state or the , can shed light on the nature of the other state. Another significant outcome is a refined set of OBE model parameters calibrated using the pole positions of , , and , rigorously addressing the cutoff dependence. These parameters provide a valuable resource for more accurate calculations of systems involving few-body , and their antiparticles. Additionally, we find no evidence of the three-body resonances after extensive search using a combination of the Gaussian expansion method and the complex scaling method.
16 pages,8 figures;Accepted for publication in PRD
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