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24 papers · 2 filters
Which Chiral Symmetry is Restored in High Temperature QCD?
Claude Bernard, Tom Blum, Carleton DeTar +7
Sigma models for the high temperature phase transition in quantum chromodynamics (QCD) suggest that at high temperature the SU(N_f) x SU(N_f) chiral symmetry becomes exact, but the…
Non-perturbative determination of the axial current normalization constant in O(a) improved lattice QCD
Martin Lüscher, Stefan Sint, Rainer Sommer +1
A finite-size technique is employed to compute the normalization constant of the isovector axial current in lattice QCD. The calculation is carried out in the quenched approx…
Improving Lattice Quark Actions
M. Alford, T. R. Klassen, G. P. Lepage
We explore the first stage of the Symanzik improvement program for lattice Dirac fermions, namely the construction of doubler-free, highly improved classical actions on isotropic a…
Non-perturbative O(a) improvement of lattice QCD
Martin Luescher, Stefan Sint, Rainer Sommer +2
The coefficients multiplying the counterterms required for O() improvement of the action and the isovector axial current in lattice QCD are computed non-perturbatively, in the q…
Towards Highly Improved Quark Actions
M. G. Alford, T. R. Klassen, G. P. Lepage
We describe two ideas useful in the construction of highly improved quark actions for simulations on coarse lattices: (1) Field transformations to solve the doubler problem without…
Recent MILC spectrum results
C. Bernard, T. Blum, T. A. DeGrand +9
We report on results from three spectrum calculations with staggered quarks: 1) a quenched calculation with the standard action for the gluons and quarks; 2) a quenched calculation…
Update on
The MILC Collaboration, C. Bernard, T. Blum +11
We describe the current status of the MILC collaboration computation of , , , and their ratios. Progress over the past year includes: better statistics…
Assorted weak matrix elements involving the bottom quark
C. Bernard, T. Blum, T. DeGrand +9
As part of a larger project to estimate the fB decay constant, we are recalculating fB_static using a variational smearing method in an effort to improve accuracy. Preliminary resu…
Critical Higgs Mass and Temperature Dependence of Gauge Boson Masses in the SU(2) Gauge-Higgs Model
F. Karsch, T. Neuhaus, A. Patkós +1
We study the effective 3-D SU(2) Gauge-Higgs model at finite temperature for Higgs-masses in the range from GeV up to GeV. The first order electroweak phase transition w…
Thermodynamics for two flavor QCD
C. Bernard, T. Blum, C. E. DeTar +9
We conclude our analysis of the N_t=6 equation of state for two flavor QCD, first described at last year's conference. We have obtained new runs at am_q=0.025 and improved runs at…
Comparing Wilson and Clover Quenched Spectroscopy with an Improved Gauge Action
Sara Collins, Robert G. Edwards, Urs M. Heller +1
We present results of quenched hadron spectroscopy comparing $\order(a)$ improved Wilson (Clover) fermions with conventional Wilson fermions. The configurations were genera…
Non-Reversibility of Molecular Dynamics Trajectories
R. G. Edwards, Ivan Horvath, A. D. Kennedy
We study the non-reversibility of molecular dynamics trajectories arising from the amplification of rounding errors. We analyse the causes of such behaviour and give arguments, ind…
Finite Temperature Lattice QCD with Clover Fermions
Claude Bernard, Tom Blum, Thomas A. DeGrand +9
We report on our simulation of finite temperature lattice QCD with two flavors of Symanzik-improved fermions and Symanzik-improved glue. Our thermodyn…
QCD with dynamical Wilson fermions at
K. M. Bitar, R. G. Edwards, U. M. Heller +1
We study QCD with two flavors of dynamical Wilson fermions at and three values of . The corresponding pion masses are 0.375, 0.324 and 0.262 in lattice units, with pion…
Exotic hybrid mesons with light quarks
Claude Bernard, Tom Blum, Thomas A. DeGrand +9
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 info…
Decay Constants from NRQCD with Dynamical Fermions
S. Collins, U. M. Heller, J. Sloan +3
We present a lattice investigation of the heavy-light meson decay constants using Wilson light quarks and NRQCD heavy quarks, partially including the effects of dynamical sea quark…
Instabilities and Non-Reversibility of Molecular Dynamics Trajectories
R. G. Edwards, Ivan Horváth, A. D. Kennedy
The theoretical justification of the Hybrid Monte Carlo algorithm depends upon the molecular dynamics trajectories within it being exactly reversible. If computations were carried…
Phase diagram of Regge quantum gravity coupled to SU(2) gauge theory
B. A. Berg, W. Beirl, B. Krishnan +2
We analyze Regge quantum gravity coupled to SU(2) gauge theory on , and simplicial lattices. It turns out that the window of the well-d…
Two-Flavor Staggered Fermion Thermodynamics at N_t = 12
Claude Bernard, Tom Blum, Carleton DeTar +6
We present results of an ongoing study of the nature of the high temperature crossover in QCD with two light fermion flavors. These results are obtained with the conventional stagg…
Spectroscopy from NRQCD with Dynamical Fermions
S. Collins, U. M. Heller, J. Sloan +3
We present a lattice investigation, partially including the effects of dynamical quarks, of the heavy-light mesons using NRQCD for the heavy quark and the Wilson action for the lig…
Absence of Parity-Flavor Breaking Phase in QCD with two Flavors of Wilson fermions for beta greater than or equal to 5.0
Khalil M. Bitar
We present data testing the existence of a parity-flavor breaking phase in simulations of QCD with two flavors of light Wilson fermions. This is done by explicit simulations on lat…
Spectroscopy from Lattice QCD
C. T. H. Davies, K. Hornbostel, G. P. Lepage +3
We present first results for spectroscopy using Lattice Non-Relativistic QCD (NRQCD). For the NRQCD action the leading order spin-dependent and next to leading order spin-ind…
Reply to Comment on ``Asymptotic Scaling in the Two-Dimensional O(3) sigma-Model at Correlation Length 10^5"
Sergio Caracciolo, Robert G. Edwards, Andrea Pelissetto +1
We reply to criticism by Patrascioiu and Seiler [hep-lat/9502019] of our results [Phys. Rev. Lett. 75, 1891 (1995), hep-lat/9411009] on asymptotic scaling in the two-dimensional $O…
QCD Function with Two Flavors of Dynamical Wilson Fermions
K. M. Bitar, R. G. Edwards, U. M. Heller +1
We test the asymptotic scaling behavior of state-of-the-art simulations of QCD with two flavors of light Wilson fermions. This is done by matching and masses on lattices of…