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arxiv: 1109.6716 · v1 · submitted 2011-09-30 · ✦ hep-lat

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Isolating the Λ(1405) in Lattice QCD

Benjamin J. Menadue , Waseem Kamleh , Derek B. Leinweber , M. Selim Mahbub
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classification ✦ hep-lat
keywords stategroundlambdaliesnegative-parityanalysisavailablebaryon
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The negative-parity ground state of the \Lambda{} baryon lies surprisingly low in mass. At 1405.1 MeV, it lies lower than the negative-parity ground state nucleon, even though it has a valence strange quark. Using the PACS-CS (2+1)-flavour full-QCD ensembles available through the ILDG, we employ a variational analysis using source and sink smearing to isolate this elusive state. We find three low-lying odd-parity states, and for the first time reproduce the correct level ordering with respect to the nearby scattering thresholds.

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  1. The Lambda 1405 at the $SU(3)$ point in lattice QCD

    hep-lat 2026-02 unverdicted novelty 7.0

    Lattice QCD at the SU(3) symmetric point extracts energy levels for singlet and octet baryon-meson channels to inform the two-pole structure of Lambda(1405).