Hyperons analogous to the Λ(1405)

Abstract

The low mass of the $\Lambda (1405)$ hyperon with $j^P=1/2^{-}$, which is higher than the ground state $\Lambda (1116)$ mass by 290 MeV, is difficult to understand in quark models. We analyze the hyperon spectrum in the bound state approach of the Skyrme model that successfully describes both the $\Lambda (1116)$ and the $\Lambda (1405)$. This model predicts that several hyperon resonances of the same spin but with opposite parity form parity doublets that have a mass difference of around 300 MeV, which is indeed realized in the observed hyperon spectrum. Furthermore, the existence of the $\Xi (1620)$ and the $\Xi (1690)$ of $j^P=1/2^{-}$ is predicted by this model. Comments on the $\Omega$ baryons and heavy quark baryons are made as well.

4 pages, talk presented at the Fifth Asia-Pacific Conference on Few-Body Problems in Physics 2011 (APFB2011), Aug. 22-26, 2011, Seoul, Korea

References in corpus (9)

• Heavy Baryons in a Quark Model
• Xi and Omega baryons in the Skyrme model
• Strangeness -2 and -3 Baryons in a Constituent Quark Model
• Analysis of the [56,2^+] Baryon Masses in the 1/Nc Expansion
• The $[56,4^{+}]$ baryons in the $1/N_c$ expansion
• Masses of $[70,{\ell }^{+}]$ Baryons in the $1/N_c$ Expansion
• Cascade production in the reactions gamma p --> K+ K+ (X) and gamma p --> K^+ K^+ pi- (X)
• Measurement of the Spin of the Xi(1530) Resonance
• Kaon-Soliton Bound State Approach to the Pentaquark States

Cited by in corpus (1)

• Why $\Xi (1690)$ and $\Xi (2120)$ are so narrow?