Hagen, C. and Hierl, D. and Schaefer, Andreas (2006) Search for the Theta(+) (1540) in lattice QCD. EUROPEAN PHYSICAL JOURNAL A, 29 (2). pp. 221-225. ISSN 1434-6001, 1434-601X
Full text not available from this repository. (Request a copy)Abstract
We report on a study of the pentaquark Theta(+)(1540), using a variety of different interpolating fields. We use chirally improved fermions in combination with Jacobi-smeared quark sources to improve the signal and get reliable results even for small quark masses. The results of our quenched calculations, which have been done on a 12(3) x 24 lattice with a lattice spacing of a = 0.148fm, do not provide any evidence for the existence of a Theta(+) with positive parity. We do observe, however, a signal compatible with nucleon-kaon scattering state. For the negative parity the results are inconclusive, due to the potential mixture with nucleon-kaon and N*-kaon scattering states.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CHIRALLY IMPROVED FERMIONS; GINSPARG-WILSON FERMIONS; PENTAQUARK SEARCHES; GAUGE-THEORY; FIXED-POINT; RESONANCE; SCATTERING; COLLISIONS; STATE; MASS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 09 Feb 2021 05:53 |
| Last Modified: | 09 Feb 2021 05:53 |
| URI: | https://pred.uni-regensburg.de/id/eprint/34217 |
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