Baryon Operators and Baryon Spectroscopy

A. Lichtl; C. Morningstar; D.G. Richards; G.T. Fleming; I. Sato; R.G. Edwards; S. Basak; S. Wallace; U.M. Heller

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Baryon Operators and Baryon Spectroscopy

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arxiv hep-lat/0601034 v1 pith:YFXLLWYK submitted 2006-01-26 hep-lat

S. Basak , R.G. Edwards , G.T. Fleming , U.M. Heller , A. Lichtl , C. Morningstar , D.G. Richards , I. Sato

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S. Wallace

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keywords baryonoperatorsreducesmearingspectroscopybasisconcludeconstruct

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The issues involved in a determination of the baryon resonance spectrum in lattice QCD are discussed. The variational method is introduced and the need to construct a sufficient basis of interpolating operators is emphasised. The construction of baryon operators using group-theory techniques is outlined. We find that the use both of quark-field smearing and link-field smearing in the operators is essential firstly to reduce the coupling of operators to high-frequency modes and secondly to reduce the gauge-field fluctuations in correlators. We conclude with a status report of our current investigation of baryon spectroscopy.

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