Engel, Georg P. and Lang, C. B. and Limmer, Markus and Mohler, Daniel and Schaefer, Andreas (2010) Meson and baryon spectrum for QCD with two light dynamical quarks. PHYSICAL REVIEW D, 82 (3): 034505. ISSN 1550-7998,
Full text not available from this repository.Abstract
We present results of meson and baryon spectroscopy using the Chirally Improved Dirac operator on lattices of size 16(3) x 32 with two mass-degenerate light sea quarks. Three ensembles with pion masses of 322(5), 470(4), and 525(7) MeV and lattice spacings close to 0.15 fm are investigated. Results for ground and excited states for several channels are given, including spin two mesons and hadrons with strange valence quarks. The analysis of the states is done with the variational method, including two kinds of Gaussian sources and derivative sources. We obtain several ground states fairly precisely and find radial excitations in various channels. Excited baryon results seem to suffer from finite size effects, in particular, at small pion masses. We discuss the possible appearance of scattering states, considering masses and eigenvectors. Partially quenched results in the scalar channel suggest the presence of a 2-particle state, however, in most channels we cannot identify them. Where available, we compare our results to results of quenched simulations using the same action.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUANTUM-FIELD THEORIES; HYBRID MONTE-CARLO; EXACTLY MASSLESS QUARKS; LATTICE QCD; SCATTERING MATRIX; VOLUME DEPENDENCE; ENERGY-SPECTRUM; CHIRAL-SYMMETRY; FERMIONS; STATES; |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Jul 2020 09:58 |
| Last Modified: | 15 Jul 2020 09:58 |
| URI: | https://pred.uni-regensburg.de/id/eprint/24328 |
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