EPJ

2023 Impact factor 2.6
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 3, 65-73

$\Lambda$(1405) as a multiquark state

S. Choe

Special Research Centre for the Subatomic Structure of Matter, University of Adelaide, Adelaide, SA 5005, Australia

Received: 11 November 1997 / Revised version: 28 April 1998 Communicated by W. Weise

Abstract
In the QCD sum rule approach we predict the $\Lambda$ (1405) mass by choosing the $\pi^0\Sigma^0$ multiquark interpolating field. It is found that the mass is about 1.419 GeV from $\Pi_1 (q^2)$ sum rule which is more reliable than $\Pi_q (q^2)$ sum rule, where $\Pi_q (q^2)$ and $\Pi_1 (q^2)$ are two invariant functions of the correlator $\Pi (q^2)$. We also present the sum rules for the K+ p and the $\pi^+\Sigma^+$ multiquark states, and compare to those for the $\pi^0\Sigma^0$ multiquark state. The mass of the $\Lambda$ (1600) can be also reproduced in our approach.

PACS
24.85.+p Quarks, gluons, and QCD in nuclei and nuclear processes - 14.20.-c Baryons (including antiparticles) - 21.10.Dr Binding energies and masses

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