Masses of excited baryons from chirally improved quenched lattice QCD

Details Masses of excited baryons from chirally improved quenched lattice QCD Masses of excited baryons from chirally improved quenched lattice QCD

2005-01-11

arxiv.org/abs/nucl-th/0501025v2

Nucl.Phys. A755 (2005) 481-484

Physics

Nuclear Physics

Nuclear Theory

Contribution to BARYONS 2004, Palaiseau, France, October 25 - 29, 2004; 4 pages, 1 figure, Style espcrc1

Scientific paper

Whereas ground state spectroscopy for quenched QCD is well understood, it is still a challenge to obtain results for excited hadron states. In our study we present results from a new approach for determining spatially optimized operators for lattice spectroscopy of excited hadrons. In order to be able to approach physical quark masses we work with the chirally improved Dirac operator, i.e., approximate Ginsparg-Wilson fermions. Since these are computationally expensive we restrict ourselves to a few quark sources. We use Jacobi smeared quark sources with different widths and combine them to construct hadron operators with different spatial wave functions. This allows us to identify the Roper state and other excited baryons, also in the strange sector.

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