Spatially improved operators for excited hadrons on the lattice
- 7 September 2004
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 70 (5) , 054502
- https://doi.org/10.1103/physrevd.70.054502
Abstract
We present a new approach for determining spatially optimized operators that can be used for lattice spectroscopy of excited hadrons. Jacobi smeared quark sources with different widths are combined to construct hadron operators with different spatial wave functions. We use the variational method to determine those linear combinations of operators that have optimal overlap with ground and excited states. The details of the new approach are discussed and we demonstrate the power of the method using examples from quenched baryon and meson spectroscopy. In particular, we study the Roper state and ρ(1450) and discuss some physical implications of our tests.Keywords
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