arXiv:1109.6716·v1·High Energy Physics — Lattice
Isolating the \Lambda(1405) in Lattice QCD
Benjamin J. Menadue🇦🇺 · Waseem Kamleh🇦🇺 · Derek B. Leinweber🇦🇺 · M. Selim Mahbub🇦🇺
Abstract
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.
Comments: 4 pages, 7 figures