Erlangen 2026 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 29: Hadron Structure and Spectroscopy V
HK 29.2: Vortrag
Donnerstag, 19. März 2026, 14:15–14:30, PHIL C 301
Weak Decay of Ω−-Dibaryons — •Emili Hill, Ishfaq Ahmad Rather, and Jürgen Schaffner-Bielich — Goethe Universität, Frankfurt am Main, Germany
We study the weak decay of Ω− dibaryons within SU(3) flavor symmetry and chiral perturbation theory. These exotic states, carrying strange quarks, are relevant for understanding hyperon-hyperon interactions in dense neutron star matter.
We examine mesonic and non-mesonic decay modes of the Ω−Ξ− and Ω−Ξ0 systems using a pole-model framework. The decay pattern shows a strong sensitivity to the binding energy є. For small values of the binding energy, mesonic decays dominate and the behavior resembles the decay of a free hyperon. As є increases, non-mesonic channels overtake the mesonic ones. The crossover appears near є ≈ 2.7 MeV for Ω−Ξ− and є ≈ 3.8 MeV for Ω−Ξ0.
These results identify the non-mesonic modes as promising channels for future searches.
The study also points to the need for improved theoretical input, especially for the maximally strange Ω−Ω− system, to understand its possible impact on neutron stars and heavy-ion collisions.
Keywords: Chiral Perturbation Theory; Dibaryons; SU(3) flavour symmetry; Hyperon-Hyperon interactions; Neutron Stars