Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 5: Theorie

HK 5.4: Talk

Friday, March 4, 2005, 14:45–15:00, TU MA005

Hadron Resonances on the Lattice — •Christian Hagen, Christof Gattringer, and Andreas Schäfer — Institut für Theoretische Physik, Universität Regensburg

We study baryons on the lattice with a special focus on excited states. For that purpose we construct several interpolators which differ in their Dirac structure. These interpolators are built from Jacobi smeared quarks with different widths to construct operators with different spatial wave functions. We then calculate all cross correlations and use the variational method to determine which combinations of operators have best overlap with ground and excited states. Our approach yields promising results for the nucleon, Ξ and Σ. Hopefully, first results for the Θ⁺ channel (pentaquark) will be available at the time of the conference.(Supported by BMBF)