1,081 research outputs found
Searching for dynamical fermion effects in UKQCD simulations
We present recent results from the UKQCD collaboration's dynamical QCD
simulations. This data has fixed lattice spacing but varying dynamical quark
mass. We concentrate on searching for an unquenching signal in the mesonic mass
spectrum where we do not find a significant effect at the quark masses
considered.Comment: 3 pages, 3 figures, Lattice2001(spectrum
Light Quenched Hadron Spectrum and Decay Constants on different Lattices
We present a study of (quenched) lattice configurations from
the APE collaboration, for using both the Wilson and the
SW-Clover fermion action. We determine the light hadronic spectrum and meson
decay constants. We extract the inverse lattice spacing using data at the
simulated values of the quark mass. We find an agreement with the experimental
data of for mesonic masses and for baryonic masses and
pseudoscalar decay constants. A larger deviation is present for the vector
decay constants.Comment: 3 pages, Talk presented at LATTICE96(spectrum
Effects of Dynamical Quarks in UKQCD Simulations
Recent results from the UKQCD Collaboration's dynamical simulations are
presented. The main feature of these ensembles is that they have a fixed
lattice spacing and volume, but varying sea quark mass from infinite
(corresponding to the quenched simulation) down to roughly that of the strange
quark mass. The main aim of this work is to uncover dynamical quark effects
from these ``matched'' ensembles. We obtain some evidence of dynamical quark
effects in the static quark potential with less effects in the hadronic
spectrum.Comment: Invited paper presented at the Workshop on Lattice Hadron Physics,
July 2001, Cairns, Australia. 7 pages. Uses espcrc2.sty (included
A High Statistics Lattice Calculation of Quark Masses with a Non-Perturbative Renormalization Procedure
We present results of a high statistics study (O(2000) configurations) of the
quark masses in the MS-bar scheme from Lattice QCD in the quenched
approximation at beta=6.0, beta=6.2 and beta=6.4 using both the Wilson and the
tree-level improved SW-Clover fermion action. We extract quark masses from the
meson spectroscopy and from the axial Ward Identity using non-perturbative
values of the renormalization constants. We compare the results obtained with
the two methods and we study the O(a) dependence of the quark masses for both
actions. Our best results are m_s^(MS-bar)(2 GeV)=(123 +- 4 +- 15) MeV and
m_c^(MS-bar)(2 GeV)=(1525 +- 40 +- 100) MeV.Comment: 3 pages, Talk presented at LATTICE97(QCD Spectrum and Quark Masses).
Small misprints corrected, no conclusions change
An analysis of the vector meson spectrum from lattice QCD
We re-analyse meson sector data from the CP-PACS collaboration's dynamical
simulations. Our analysis uses several different approaches, and compares the
standard naive linear fit with the Adelaide Anzatz. We find that setting the
scale using the J parameter gives remarkable agreement among data sets. Our
predictions for the rho and phi masses have very small statistical errors, ~ 3
MeV, but the discrepancy between the different fitting approaches is ~ 40 MeV.Comment: 3 pages, 4 figures, 3 tables, proceedings for Lattice2003(Spectrum
RESULTS FOR THE B-MESON DECAY CONSTANT FROM THE APE COLLABORATION
The decay constant for the B-meson in the static limit is calculated using
the Wilson and clover actions at various lattice spacings. We show that both
the contamination of our results by excited states and the effects finite
lattice spacing are at most the order of the statistical uncertainties. A
comparison is made of our results and those obtained in other studies. Values
for and are also given.Comment: Contribution to Lattice'94, 3 pages PostScript, uuencoded compresse
Lattice QCD with Dynamical Quarks from the UKQCD Collaboration
A brief overview of the lattice technique of studying QCD is presented.
Recent results from the UKQCD Collaboration's simulations with dynamical quarks
are then presented. In this work, the calculations are all at a fixed lattice
spacing and volume, but varying sea quark mass from infinite (corresponding to
the quenched simulation) down to roughly that of the strange quark mass. The
main aim of this work is to uncover dynamical quark effects from these
``matched'' ensembles.Comment: Invited paper presented at the International Light-Cone Workshop
"Light-cone Physics: Particles and Strings", September 2001, Trento, Italy. 7
page
Recent Results from (Full) Lattice QCD
An overview of the Lattice technique for studies of the strong interaction is
given. Recent results from the UKQCD lattice collaboration are presented. These
concentrate on spectral quantities calculated using full (i.e. unquenched) QCD.
A comparison with quenched results is made. Novel methods of extracting
spectral properties from two-point functions are described.Comment: Invited Review Talk at "Workshop on Light-Cone QCD and
Nonperturbative Hadron Physics", December 1999, Adelaide, Australia. To be
published in the proceedings (World Scientific). 10 pages latex, including 5
ps figure
Light Quark Mass Determinations from the Lattice
This paper is a review of recent lattice determinations of the light quark
masses. It describes the method employed to calculate quark masses in the
lattice formulation, and the extrapolations required to reach the physical
regime. This review is designed to be accessible to a general audience, not
specifically lattice theorists.Comment: Invited review talk at QCD97, Montpellier (July '97). 8 pages, 2
figures. Requires espcrc2.sty Minor changes: a reference added and a table
updated accordingl
Recent Lattice QCD Results from the UKQCD Collaboration
The lattice technique of studying the strong interaction of matter is used to
obtain predictions of the hadronic spectrum. These simulations were performed
by the UKQCD collaboration using full (unquenched) QCD. Details of the results,
a comparison with quenched data, and novel methods of extracting spectral
properties are described.Comment: Paper presented at the Computational Physics Conference CCP2000, 3-8
Decmeber 2000, Gold Coast, Australia, 5 pages, 3 figure
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