Isolating the Λ(1405) in lattice QCD
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2012
Authors
Menadue, B.
Kamleh, W.
Leinweber, D.
Mahbub, M.
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Physical Review Letters, 2012; 108(11):112001-1-112001-5
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Benjamin J. Menadue, Waseem Kamleh, Derek B. Leinweber, and M. Selim Mahbub
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Abstract
The odd-parity ground state of the Λ baryon lies surprisingly low in mass. At 1405 MeV, it lies lower than the odd-parity ground-state nucleon, even though it has a valence strange quark. Using the PACS-CS (2+1)-flavor full-QCD ensembles, we employ a variational analysis using source and sink smearing to isolate this elusive state. For the first time we reproduce the correct level ordering with respect to nearby scattering thresholds. With a partially quenched strange quark to produce the appropriate kaon mass, we find a low-lying, odd-parity mass trend consistent with the experimental value.
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© 2012 American Physical Society