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Effects of non-perturbatively improved dynamical fermions in QCD at fixed lattice spacing

Allton, C.R.; Booth, S.P.; Bowler, K.C.; Garden, J.; Hart, A.; Hepburn, D.; Irving, A.C.; Joo, B.; Kenway, R.D.; Maynard, C.M.; McNeile, C.; Michael, C.; Pickles, S.M.; Sexton, J.C.; Sharkey, K.J.; Sroczynski, Z.; Talevi, M.; Teper, M. and Wittig, H. (2002) Effects of non-perturbatively improved dynamical fermions in QCD at fixed lattice spacing. Physical Review D, 65 . Article Number: 054502. ISSN 1550-2368 (online); 1550-7998 (print)

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Official URL: http://link.aps.org/abstract/PRD/v65/e054502

Abstract

We present results for the static inter-quark potential, lightest glueballs, light hadron spectrum and topological susceptibility using a non-perturbatively improved action on a $16^3\times 32$ lattice at a set of values of the bare gauge coupling and bare dynamical quark mass chosen to keep the lattice size fixed in physical units ($\sim 1.7$ fm). By comparing these measurements with a matched quenched ensemble, we study the effects due to two degenerate flavours of dynamical quarks. With the greater control over residual lattice spacing effects which these methods afford, we find some evidence of charge screening and some minor effects on the light hadron spectrum over the range of quark masses studied ($M_{PS}/M_{V}\ge0.58$). More substantial differences between quenched and unquenched simulations are observed in measurements of topological quantities.

Item Type:Article
Additional Information:LTH 509. arXiv Number: arXiv:hep-lat/0107021v3. Additional citation information: PHYSICAL REVIEW D, VOLUME 65, 054502; 0556-2821/2002/65(5)/054502(24). 24 pages. Published 30 January 2002. Issue: March 2002.
Uncontrolled Keywords:LIGHT HADRON SPECTROSCOPY; HYBRID MONTE-CARLO; GAUGE-THEORY; TOPOLOGICAL SUSCEPTIBILITY; O(A) IMPROVEMENT; 2 FLAVORS; RENORMALIZATION-CONSTANTS; STATIC POTENTIALS; GLUEBALL SPECTRUM; DECAY CONSTANTS
Subjects:Q Science > QC Physics
Departments, Research Centres and Related Units:Academic Faculties, Institutes and Research Centres > Faculty of Science > Department of Mathematical Sciences
DOI:10.1103/PhysRevD.65.054502
Publisher's Statement:©2002 The American Physical Society
Related URLs:
Refereed:Yes
Status:Published
ID Code:571
Deposited On:31 Oct 2008 13:57
Last Modified:05 Mar 2012 16:21

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