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The chiral approach to Meson-Baryon interactions with S = -2

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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2022, Tutor: Volodymyr Magas

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We show that two Ξ∗ poles can be dynamically generated in a coupled-channels chiral model with next-to-leading order terms in Lagrangian, focusing on the study of low-energy mesonbaryon scattering in the strangeness S = −2 sector and isospin I = 1/2. One of the resonances found, which has a mass of about 1600 MeV, couples very strongly to the πΞ channel. Consequently, it can be identified as the Ξ(1620) state with JP = 1/2−. The second pole detected, near the ¯K Σ threshold, can be identified as an s-wave ¯K Σ molecular state, which we can associate with the Ξ(1690) resonance assigning it the same quantum numbers as the previous one

# metadata.dc.title[].value
The chiral approach to Meson-Baryon interactions with S = -2