Extracting Low-Lying Lambda Resonances Using Correlation Matrix Techniques

preprint2011arXivOpen access

Abstract

The lowest-lying negative-parity state of the Lambda is investigated in (2+1)-flavour full-QCD on the PACS-CS configurations made available through the ILDG. We show that a variational analysis using multiple source and sink smearings can extract a state lying lower than that obtained by using a standard fixed smeared source and sink operator alone.

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