19 research outputs found
A Mythopoeic Wordsearch
There are over 100 names, places, things, foods, people, words from Old Solar and Elvish, races, etc. taken from the works of Tolkien, Lewis and Williams, and at least one from L. Frank Baum, in this puzzle
Exotic hybrid mesons with light quarks
Hybrid mesons, made from a quark, an antiquark and gluons, can have quantum
numbers inaccessible to conventional quark-antiquark states. Confirmation of
such states would give information on the role of "dynamical" color in low
energy QCD. We present preliminary results for hybrid meson masses using light
Wilson valence quarks.Comment: 4 pages, 4 figures, Talk presented at LATTICE96(spectrum
Finite Temperature Lattice QCD with Clover Fermions
We report on our simulation of finite temperature lattice QCD with two
flavors of Symanzik-improved fermions and
Symanzik-improved glue. Our thermodynamic simulations were performed on an lattice, and we have performed complementary zero temperature
simulations on an lattice. We compare our results to those from
simulations with two flavors of Wilson fermions and discuss the improvement
resulting from use of the improved action.Comment: 3 pages, 4 figures, Talk presented at Lattice 9
Update on the hadron spectrum with two flavors of staggered quarks
We present an update on the MILC Collaboration's light hadron spectrum
calculation with two flavors of dynamical, staggered quarks. We present
extrapolations of the nucleon to rho mass ratio to the continuum limit for
fixed values of the pi to rho mass ratio including the physical one.Comment: 3 pages, LaTex with espcrc2 and epsf, 5 postscript figures included,
Lattice '97 Proceeding
Heavy-light decay constants---MILC results with the Wilson action
We present the current status of our ongoing calculations of pseudoscalar
meson decay constants for mesons that contain one light and one heavy quark
(f_B, f_{B_s}, f_D, f_{D_s}). We are currently generating new gauge
configurations that include dynamical quarks and calculating the decay
constants. In addition, we have several new results for the static
approximation. Those results, as well as several refinements to the analysis,
are new since Lattice '96. Our current (still preliminary) value for f_B is 156
+- 11 +- 30 +- 14 MeV, where the first error is from statistical and fitting
errors, the second error is an estimate of other systematic errors within the
quenched approximation and the third error is an estimate of the quenching
error. For the ratio f_{B_s}/f_B, we get 1.11 +- 0.02 +- 0.03 +- 0.07.Comment: 8 pages, 9 figures, LaTeX, uses espcrs2, epsf, Invited talk presented
by S. Gottlieb at Lattice QCD on Parallel Computers, University of Tsukuba,
March, 1997, to appear in the proceeding
Light hadron spectrum---MILC results with the Kogut-Susskind and Wilson actions
We present the current status of our ongoing calculations of the light hadron
spectrum with both Kogut-Susskind (KS) and Wilson quarks in the valence or
quenched approximation. We discuss KS quarks first and find that the chiral
extrapolation is potentially the biggest source of systematic error. For the
Wilson case, we focus on finite volume and source size effects at 6/g^2=5.7. We
find no evidence to support the claim that there is a finite volume effect
between N_s=16 and 24 of approximately 5%.Comment: 11 pages, 11 figures, LaTeX, uses espcrs2, epsf, Invited talk
presented by S. Gottlieb at Lattice QCD on Parallel Computers, University of
Tsukuba, March, 1997, to appear in the proceeding
A problem-structuring method for complex societal decisions: Its philosophical and psychological dimensions
A novel approach to problem-structuring for decisions relating to the sustainable development of large-scale infrastructure is presented. The philosophical (a critical realist ontology and epistemology), psychological (implications of behavioural and cognitive psychology), and systems dimensions (dynamics and emergent properties) of the problem are discussed, and form the basis of the approach. The problem is structured as a system of "trilemmas" (a means of representing and criticising sets of three competing forces), representing different aspects of the problem and considered in the context of a number of problem dimensions. A case study relating to the development of a sustainable water system for a major Australian metropolis is developed to test the value of the approach
A problem-structuring method for complex societal decisions: Its philosophical and psychological dimensions
A novel approach to problem-structuring for decisions relating to the sustainable development of large-scale infrastructure is presented. The philosophical (a critical realist ontology and epistemology), psychological (implications of behavioural and cognitive psychology), and systems dimensions (dynamics and emergent properties) of the problem are discussed, and form the basis of the approach. The problem is structured as a system of "trilemmas" (a means of representing and criticising sets of three competing forces), representing different aspects of the problem and considered in the context of a number of problem dimensions. A case study relating to the development of a sustainable water system for a major Australian metropolis is developed to test the value of the approach.Problem-structuring Complex societal problems Sustainable development Psychology Practical philosophy