Lambda(1405) as a multiquark state

Details Lambda(1405) as a multiquark state Lambda(1405) as a multiquark state

1997-11-30

arxiv.org/abs/nucl-th/9712003v2

Eur.Phys.J. A3 (1998) 65-73

Physics

Nuclear Physics

Nuclear Theory

revtex, 12 pages, 13 ps figures; considerable revision, accepted in Eur. Phys. J. (A)

Scientific paper

10.1007/s100500050148

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.

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