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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Structure and Dynamics of Nuclei II

HK 12.4: Vortrag

Montag, 18. März 2019, 17:15–17:30, HS 14

Resonances and virtual states in few-body systems — •Sebastian Dietz¹, Hans-Werner Hammer^{1, 2}, Sebastian König^{1, 2}, and Joel E. Lynn^{1, 2} — ¹IKP, TU Darmstadt — ²EMMI, GSI Darmstadt

We present an investigation of the analytic structure of the S-matrix for three-body systems using the framework of pionless effective field theory. The three-body Faddeev equation in momentum space is rewritten using the dimer formalism and analytically continued onto the unphysical sheet below the positive real energy axis. This formalism is applied to the three-boson system with large scattering length. The investigation is performed as a function of the two-body scattering length and the range of validity is examined. As a further application, the position of the triton virtual state is calculated.