The $\Lambda$(1600): A Strange Hybrid Baryon

Abstract

We use the method of QCD sum rules to investigate a possible hybrid baryon with the quantum numbers of the $\Lambda$. Using a current composed of uds quarks in a color octet and a gluon, a strange hybrid, the ${\Lambda }_H$ is found about 500 MeV above the $\Lambda$, and we identify it as the $\Lambda (1600)$. Using our sigma/glueball model we predict a large branching fraction for the ${\Lambda }_H\to \Lambda +\sigma (\pi \pi$ resonance), and the experimental search for this decay mode could provide a test of the hybrid nature of the $/Lambda(1600)$.

Revtex file, 3 Figures

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• Study of the $D_s^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$ decay and measurement of $f_0$ masses and widths
• Scalar Mesons, Glueballs, Instantons and the Glueball/Sigma
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Cited by in corpus (7)

• Baryon spectroscopy
• Magnetic moments of the low-lying {1/2}^- octet baryon resonances
• The $\Lambda (1405)$ as a Hybrid
• Mass predictions of triply heavy hybrid baryons via QCD sum rules
• Hybrid and Conventional Baryons in the Flux-Tube and Quark Models
• Hadron Spectroscopy without Constituent Glue
• Baryons and baryoniums in the perspective of QCD sum rules