Isolating the \Lambda(1405) in Lattice QCD
Benjamin J. Menadue, Waseem Kamleh, Derek B. Leinweber, and M. Selim, Mahbub
TL;DR
This paper uses lattice QCD techniques to isolate and analyze the mbda(1405) baryon state, successfully reproducing its correct level ordering relative to scattering thresholds.
Contribution
It is the first to isolate the mbda(1405) in lattice QCD and accurately reproduce its level ordering using variational analysis.
Findings
Identified three low-lying odd-parity states.
Reproduced the correct level ordering of mbda(1405).
Demonstrated effectiveness of source and sink smearing in state isolation.
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.
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