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2011

Isolating the \Lambda(1405) in Lattice QCD

Menadue, Benjamin J., Kamleh, Waseem, Leinweber, Derek B. et al.

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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.

Isolating the \Lambda(1405) in Lattice QCD · Around

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