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hep-lat/9211064
Fermion mass in the Wilson-Yukawa approach for chiral Yukawa theory
We consider a modification of the Wilson-Yukawa model to overcome its difficulty that the fermion mass is not proportional to the Higgs vacuum expectation value. In the modification scalar and fermionic regulator fields are introduced so that all the physical fermion fields possess shift symmetry when the Yukawa coupli...
1992-11-27
2015-06-25
[ "hep-lat" ]
Sinya Aoki and Yoshio Kikukawa
hep-lat/9211065
The S, U and \Delta\rho parameters in the Zaragoza proposal for lattice chiral gauge fermions
Using the Zaragoza proposal for lattice chiral gauge fermions, the S, U and \Delta\rho parameters have been calculated at one loop. It is shown that the continuum values for these quantities can be reproduced without requiring explicit fine tuning of counterterms. Furthermore, fermion fields doubling is not necessary. ...
1992-11-27
2010-03-19
[ "hep-lat" ]
Jose Luis Alonso, Philippe Boucaud, Jose Luis Cortes, Felipe Lesmes, and Elena Rivas
hep-lat/9211063
Enumeration of self avoiding trails on a square lattice using a transfer matrix technique
We describe a new algebraic technique, utilising transfer matrices, for enumerating self-avoiding lattice trails on the square lattice. We have enumerated trails to 31 steps, and find increased evidence that trails are in the self-avoiding walk universality class. Assuming that trails behave like $A \lambda ^n n^{11 \o...
1992-11-27
2009-10-22
[ "hep-lat" ]
A R Conway and A J Guttmann
hep-lat/9211061
No strong coupling regime in the fermion-Higgs sector of the standard model
We present results for the renormalized quartic self-coupling $\lm_R$ and the renormalized Yukawa coupling $y_R$ in a fermion-Higgs model with two SU(2) doublets, indicating that these couplings are not very strong.
1992-11-26
2009-10-22
[ "hep-lat" ]
Wolfgang Bock, Christoph Frick, Jan Smit and Jeroen C. Vink
hep-lat/9211060
Staggered fermion approach to chiral gauge theories on the lattice
The staggered fermion approach to build models with chiral fermions is briefly reviewed. The method is tested in a U(1) model with axial vector coupling in two and four dimensions.
1992-11-25
2009-10-22
[ "hep-lat" ]
W. Bock, J. Smit and J.C. Vink
hep-lat/9211059
Finite temperature QED3 with light fermions
Non-compact QED3 is simulated both in the quenched and unquenched cases. In particular, we investigate the restoration of chiral symmetry at finite temperature. We also compute the zero temperature spectrum of the theory, including (in the quenched case) the dynamical fermion mass. From these two set of data, one can o...
1992-11-25
2009-10-22
[ "hep-lat" ]
J.B. Kogut and J.-F. Lagae
hep-lat/9211058
Chiral Corrections to Lattice Calculations of Charge Radii
Logarithmic divergences in pion and proton charge radii associated with chiral loops are investigated to assess systematic uncertainties in current lattice determinations of charge radii. The chiral corrections offer a possible solution to the long standing problem of why present lattice calculations yield proton and p...
1992-11-24
2009-10-22
[ "hep-lat", "hep-ph", "nucl-th" ]
Derek B. Leinweber and Thomas D. Cohen
hep-lat/9211057
Meson Form-factors and Wave-functions with Wilson fermions
Results for semi-leptonic form-factors for processes like $D \to K l \nu$ and the Bethe-Salpeter amplitudes (BSA) for pion and rho mesons are presented. The form-factor data is consistent with previous calculations. We find that the long distance fall-off of BSA for both $\pi$ and $\rho$ is very well fit by an exponent...
1992-11-24
2009-10-22
[ "hep-lat" ]
R. Gupta, D. Daniel, J. Grandy
hep-lat/9211055
Finite-Size Scaling on the Ising Coexistence Line
We study the finite-size scaling of moments of the magnetization in the low-temperature phase of the two-dimensional Ising model.
1992-11-23
2009-10-22
[ "hep-lat" ]
S. Gupta and A. Irbaeck
hep-lat/9211056
Study of the complex fermion determinant in a $\rm U(1)_L \otimes U(1)_R$ symmetric Yukawa model
Lattice theories that contain chiral multiplets of fermions can have complex fermion determinants. This is for example the case for the $\rm U(1)_L \otimes U(1)_R$ symmetric Yukawa model with mirror fermions, if the number of generations of fermions and mirror fermions is odd. Whether a numerical simulation of such a m...
1992-11-23
2010-12-23
[ "hep-lat" ]
Gernot Muenster and Markus Plagge
hep-lat/9211054
Glueball wavefunctions
We measure Coulomb-gauge wavefunctions of the scalar and tensor glueballs in SU(2) Yang-Mills. The problem of contamination by flux states is discussed, and a new analysis method described. The large size of the tensor glueball is confirmed. Preliminary results in the deconfined phase show no significant changes.
1992-11-22
2009-10-22
[ "hep-lat" ]
Philippe de Forcrand and Keh-Fei Liu
hep-lat/9211053
High precision single-cluster Monte Carlo measurement of the critical exponents of the classical 3D Heisenberg model
We report measurements of the critical exponents of the classical three-dimensional Heisenberg model on simple cubic lattices of size $L^3$ with $L$ = 12, 16, 20, 24, 32, 40, and 48. The data was obtained from a few long single-cluster Monte Carlo simulations near the phase transition. We compute high precision estimat...
1992-11-19
2009-10-22
[ "hep-lat" ]
C. Holm, and W. Janke
hep-lat/9211051
Infinite Volume, Continuum Limit of Valence Approximation Hadron Masses
We obtain estimates of several hadron mass ratios, for Wilson quarks in the valence (quenched) approximation, extrapolated to physical quark mass, infinite volume and zero lattice spacing.
1992-11-19
2009-10-22
[ "hep-lat", "hep-ph" ]
F. Butler, H. Chen, A. Vaccarino, J. Sexton, and D. Weingarten
hep-lat/9211052
Yet another way to obtain low temperature expansions for discrete spin systems
I present a modification of the shadow-lattice technique, which allows one to derive low temperature series for discrete spin models to high orders. Results are given for the 3-d Ising model up to 64 excited bonds, for the 4-d Ising model up to 96 excited bonds and the 3-d Potts model up to 56 excited bonds.
1992-11-19
2009-10-22
[ "hep-lat" ]
C. Vohwinkel
hep-lat/9211050
The Mechanism of Complex Langevin Simulations
We discuss conditions under which expectation values computed from a complex Langevin process $Z$ will converge to integral averages over a given complex valued weight function. The difficulties in proving a general result are pointed out. For complex valued polynomial actions, it is shown that for a process converging...
1992-11-18
2009-10-22
[ "hep-lat" ]
H. Gausterer and Sean Lee
hep-lat/9211048
Quenched Lattice Results for $f_B$ and $f_D$
We have computed the decay constants for the $B$ and $D$ mesons, using quenched lattices at $\beta=6.3$, by interpolating between the static approximation of Eichten and the conventional (``heavy'' Wilson fermion) method. A more careful treatment of the static result using better sources with longer time-displacements ...
1992-11-18
2009-10-22
[ "hep-lat" ]
Claude Bernard, James Labrenz and Amarjit Soni
hep-lat/9211047
The Loop-Cluster Algorithm for the Case of the 6 Vertex Model
We present the loop algorithm, a new type of cluster algorithm that we recently introduced for the F model. Using the framework of Kandel and Domany, we show how to GENERALIZE the algorithm to the arrow flip symmetric 6 vertex model. We propose the principle of least possible freezing as the guide to choosing the value...
1992-11-18
2007-05-23
[ "hep-lat", "cond-mat" ]
H.G. Evertz and M. Marcu
hep-lat/9211049
Multicanonical Cluster Algorithm
In this talk I present a multicanonical hybrid-like two-step algorithm, which consists of a microcanonical spin system update with demons, and a multicanonical demon refresh. The demons act as a buffer between the multicanonical heat bath and the spin system, allowing for a large variety of update schemes. In this work...
1992-11-18
2009-10-22
[ "hep-lat", "cond-mat" ]
K. Rummukainen
hep-lat/9211046
The Charmonium Spectrum on the Lattice: A Status Report
We present our most recent results on the charmonium spectrum using relativistic Wilson fermions. We study the dependence of the spectrum on the charm quark mass and the Wohlert-Sheikholeslami improvement term.
1992-11-17
2010-11-19
[ "hep-lat", "hep-ph" ]
Aida X. El-Khadra
hep-lat/9211045
Charmed Meson Spectroscopy and Matrix Elements with an O(a)-Improved Clover Fermion Action
We present preliminary results for the spectrum and decay matrix elements for heavy-light and heavy-heavy mesons, obtained on the 64-node Meiko Computing Surface at the University of Edinburgh. Quark propagators are computed with an O(a)-improved fermion action on 24^3x48 lattices at beta = 6.2, using three values of t...
1992-11-17
2019-06-05
[ "hep-lat" ]
UKQCD Collaboration, presented by David Richards
hep-lat/9211044
Gravitational Action Versus Entropy on Simplicial Lattices in Four Dimensions
We investigate quantum gravity on simplicial lattices using Regge calculus with special emphasize on the problem of the unbounded action. The role of the entropy for the path integral is discussed in detail. Our numerical results show further evidence for the existence of an entropy dominated region with well defined e...
1992-11-17
2009-10-22
[ "hep-lat" ]
W. Beirl, E. Gerstenmayer, H. Markum and J. Riedler
hep-lat/9211041
Results in the static approximation
We present a comprehensive study of finite volume and lattice spacing effects on observables calculated in the static approximation. Ground state projection using smearing techniques is studied at $\beta=6.26$. We give high statics results for the pseudoscalar decay constant after extrapolating to the chiral and contin...
1992-11-16
2009-10-22
[ "hep-lat" ]
C. Alexandrou, S. Guesken, F. Jegerlehner, K. Schilling, R. Sommer
hep-lat/9211043
The Charm Quark on the Lattice
We formulate lattice fermions in a way that encompasses Wilson fermions as well as the static and non-relativistic approximations. In particular, we treat $m_qa$ systematically ($m_q$ is the fermion mass) showing how to understand the Wilson action as an effective action for systems with $\vek{p}\ll m_q$. The results s...
1992-11-16
2009-10-22
[ "hep-lat" ]
Andreas S. Kronfeld
hep-lat/9211042
The Static Approximation of Heavy-Light Quark-Systems - A Systematic Lattice Study
We present a study of {\it finite} $a$ and {\it volume} effects of the leptonic decay constant $f$ of heavy pseudoscalar mesons in the static approximation. This study is performed on a number of lattices at $\beta=$ 5.74,~6.0 and 6.26 covering sizes from about 0.7~$fm$ to 2~$fm$. We confirm that beyond 1.5~$fm$ the vo...
1992-11-16
2009-10-22
[ "hep-lat" ]
C. Alexandrou, S. Guesken, F. Jegerlehner, K. Schilling, R. Sommer
hep-lat/9211038
The Spin Content of the Nucleon
The fraction of the nucleon spin that is carried by the quarks, $\Delta \Sigma$, is computed in lattice QCD with dynamical staggered fermions. We obtain the value $\Delta \Sigma = 0.18 \pm 0.02$.
1992-11-13
2009-10-22
[ "hep-lat" ]
R. Altmeyer, M. G\"ockeler, R. Horsley, E. Laermann and G. Schierholz
hep-lat/9211040
Quenched Light Hadron Spectroscopy: Comparing the Wilson and O(a)-Improved Fermion Actions
We have studied the light hadron spectrum and decay constants for quenched QCD at beta=6.2 on a 24^3x48 lattice. We compare the results obtained using a nearest-neighbour O(a)-improved ("clover") fermion action with those obtained using the standard Wilson fermion action on the same gauge configurations. For pseudoscal...
1992-11-13
2019-06-05
[ "hep-lat" ]
UKQCD Collaboration, presented by Alan D. Simpson
hep-lat/9211037
Improved Langevin Methods for Spin Systems
We investigate methods for variance reduction and the elimination of systematic error in a Fourier accelerated Langevin scheme for general spin models. We present results for the $SU(3)\times SU(3)/SU(3)$ model in two-dimensions that are consistent wit h those from multi-grid methods. We argue that the timing for the L...
1992-11-13
2009-10-22
[ "hep-lat" ]
I T Drummond and R R Horgan
hep-lat/9211039
Gauge Invariant Smearing and Matrix Correlators using Wilson Fermions at beta=6.2
We present an investigation of gauge invariant smearing for Wilson fermions on a $24^3 \times 48$ lattice at $\beta = 6.2$. We demonstrate a smearing algorithm that allows a substantial improvement in the determination of the baryon spectrum obtained using propagators smeared at both source and sink, at only a small co...
1992-11-13
2019-08-27
[ "hep-lat" ]
UKQCD Collaboration (presented by Sara Collins)
hep-lat/9211036
Baryon Density Correlations in the Quark Plasma, MIMD Lattice Calculation
As part of an ongoing effort to characterize the high temperature phase of QCD, we measure the quark baryon density in the vicinity of a fixed test quark and compare it with similar measurements at low temperature and at the crossover temperature. Such an observable has also been studied by the Vienna group. We find an...
1992-11-12
2008-11-26
[ "hep-lat" ]
C. Bernard, T. A. DeGrand, C. DeTar, S. Gottlieb, A. Krasnitz, R. L. Sugar and D. Toussaint (MILC Collaboration)
hep-lat/9211033
Non-Relativistic QCD for Heavy Quark Systems
We employ a nonrelativistic version of QCD (NRQCD) to study heavy quark-antiquark bound states in the lowest approximation without fine structure. We use gluon configurations on a 16^3 by 48 lattice at beta=6.2 from the UKQCD collaboration. For quark masses in the vicinity of the b we obtain bound state masses for S, P...
1992-11-12
2010-11-01
[ "hep-lat" ]
S.Catterall, F.Devlin, I.Drummond, R.Horgan, A. Simpson
hep-lat/9211034
Blockspin Scheme and Cluster Algorithm for Quantum Spin Systems
We present a numerical study using a cluster algorithm for the 1-d $S=1/2$ quantum Heisenberg models. The dynamical critical exponent for anti-ferromagnetic chains is $z=0.0(1)$ such that critical slowing down is eliminated.
1992-11-12
2007-05-23
[ "hep-lat" ]
He-Ping Ying and Uwe-Jens Wiese (Bern University)
hep-lat/9211035
Quark Confinement in Multi-Flavor Quantum Chromodynamics
It is investigated how quark confinement depends on the number of flavors, $N_f$, in QCD on the lattice with Wilson quarks. We strengthen and extend the conclusion reported at {\it Lattice 91}: (1) For $N_f \le 6$ the finite temperature deconfining transition/crossover line crosses the chiral limit at finite $\beta$. W...
1992-11-12
2009-10-22
[ "hep-lat" ]
Y. Iwasaki, K. Kanaya, S. Sakai, and T. Yoshie
hep-lat/9211030
A method for putting chiral fermions on the lattice
We describe a method to put chiral gauge theories on the lattice. Our method makes heavy use of the effective action for chiral fermions in the continuum, which is in general complex. As an example we discuss the chiral Schwinger model.
1992-11-11
2014-11-17
[ "hep-lat" ]
M. Goeckeler and G. Schierholz
hep-lat/9211028
Anomalous Fermion Number Non-Conservation on the Lattice
The anomaly for the fermion number current is calculated on the lattice in a simple prototype model with an even number of fermion doublets.
1992-11-11
2009-10-22
[ "hep-lat" ]
Istvan Montvay (CERN, Geneva, Switzerland)
hep-lat/9211031
Multigrid meets Neural Nets
We present evidence that multigrid (MG) works for wave equations in disordered systems, e.g. in the presence of gauge fields, no matter how strong the disorder. We introduce a "neural computations" point of view into large scale simulations: First, the system must learn how to do the simulations efficiently, then do th...
1992-11-11
2009-10-22
[ "hep-lat" ]
M. Baeker, G. Mack and M. Speh
hep-lat/9211027
Contamination of Excited States in Quenched QCD Hadron Propagators
Quenched QCD hadron spectrum is calculated with Wilson's quark action at $\beta=5.85$ and 6.0 on a $24^3 \times 54$ lattice. We discuss the problem of whether we have extracted the mass of the ground state at these $\beta$'s without contamination of the excited states. We show that the masses of the first excited state...
1992-11-11
2009-10-22
[ "hep-lat" ]
QCDPAX collaboration: Y.Iwasaki, K.Kanaya, S.Sakai, T.Yoshie, T.Hoshino, T.Shirakawa and Y.Oyanagi
hep-lat/9211026
Fermion spectrum in the quenched U(1) chiral Wilson-Yukawa model
Nature of charged fermion state is investigated in the quenched U(1) chiral Wilson-Yukawa model. Fitting the charged fermion propagator with a single hyperbolic cosine does not yield reliable result. On the other hand the behaviour of the propagator including large lattice size dependence is well described by the large...
1992-11-11
2009-10-22
[ "hep-lat" ]
S. Aoki, H. Hirose and Y. Kikukawa
hep-lat/9211032
Decoupling of Photon Propagator in Compact QED
In compact QED$_{2+1}$ quantum monopole fluctuations induce confinement by expelling electric flux in a dual Meissner effect. Guided by Landau-Ginzburg theory, one might guess that the inverse London penetration depth $\lambda^{-1}$---the only physical mass scale---equals the photon propagator mass pole $M_\gamma$. I s...
1992-11-11
2009-10-22
[ "hep-lat" ]
Ken Yee
hep-lat/9211029
Unstable particles in finite volume: The broken phase of the $4$-d $O(4)$ non-linear $\sigma$-model
According to a proposal of L\"uscher it is possible to determine elastic scattering phases in infinite volume from the energy spectrum of two-particle states in a periodic box. We demonstrate the applicability of this method in the broken phase of the 4-dimensional $O(4)$ non-linear $\sigma$-model in a Monte-Carlo st...
1992-11-11
2009-10-22
[ "hep-lat" ]
Frank Zimmermann, J\"org Westphalen, Meinulf G\"ockeler and Hans A. Kastrup
hep-lat/9211022
How Do Fermions Behave on a Random Lattice?
Comparing random lattice, naive and Wilson fermions in two dimensional abelian background gauge field, we show that the doublers suppressed in the free field case are revived for random lattices in the continuum limit unless gauge interactions are implemented in a non--invariant way.
1992-11-10
2009-10-22
[ "hep-lat", "hep-th" ]
C J Griffin and T D Kieu
hep-lat/9211023
Quantum-Gravity Path-Integrals on Simplicial Lattices
Euclidean quantum-gravity path-integrals are investigated within Regge calculus by computer simulations. The domain of integration is restricted by introducing a lower limit for the fatness of each simplex. We use the standard hypercubic triangulation of the 4-torus and irregularly triangulated lattices obtained by ins...
1992-11-10
2009-10-22
[ "hep-lat" ]
W. Beirl, E. Gerstenmayer, H. Markum
hep-lat/9211024
Strings with Extrinsic Curvature: An Analysis of the Crossover Regime
We present the results of a set of Monte Carlo simulations of Dynamically Triangulated Random Surfaces embedded in three dimensions with an extrinsic curvature dependent action. We analyze several observables in the crossover regime and discuss whether or not our observations are indicative of the presence of a phase t...
1992-11-10
2009-10-22
[ "hep-lat" ]
Mark Bowick, Paul Coddington, Leping Han, Geoffrey Harris and Enzo Marinari
hep-lat/9211025
Hamiltonian lattice gauge theory: wavefunctions on large lattices
We discuss an algorithm for the approximate solution of Schrodinger's equation for lattice gauge theory, using lattice SU(3) as an example. A basis is generated by repeatedly applying an effective Hamiltonian to a ``starting state.'' The resulting basis has a cluster decomposition and long-range correlations. One such ...
1992-11-10
2016-08-31
[ "hep-lat" ]
J. B. Bronzan
hep-lat/9211021
A streamlined method for chiral fermions on the lattice
We discuss the use of renormalization counterterms to restore the chiral gauge symmetry in a lattice theory of Wilson fermions. We show that a large class of counterterms can be implemented automatically by making a simple modification to the fermion determinant.
1992-11-09
2014-11-17
[ "hep-lat" ]
Geoffrey T. Bodwin, Eve V. Kovacs
hep-lat/9211020
The Gluon Propagator in Momentum Space
We give preliminary numerical results for the gluon propagator evaluated both in coordinate and momentum space on a 16^3X40 quenched lattice at beta=6.0. Our findings are compared with earlier results in the literature at zero momentum. In addition, by considering nonzero momenta we attempt to extract the form of the p...
1992-11-09
2009-10-22
[ "hep-lat" ]
C. Bernard, C. Parrinello and A. Soni
hep-lat/9211019
Lattice Calculation of Point-to-Point Hadron Current Correlation
Point-to-point correlation functions of hadron currents in the QCD vacuum are calculated on a lattice and analyzed using dispersion relations, providing physical information down to small spatial separations. Qualitative agreement with phenomenological results is obtained in channels for which experimental data are ava...
1992-11-09
2008-11-26
[ "hep-lat" ]
M.-C. Chu, J. M. Grandy, S. Huang and J. W. Negele
hep-lat/9211018
Gribov Copies and Other Gauge Fixing Beasties on the Lattice
Write-up for Lattice'92, held in Amsterdam. preprint LTH 291. Comes with 6 PostScript figures and 1 sty-file. We study the nature of gauge fixing ambiguities in two dimensional gauge theories. We find that these ambiguities can be related to the asociated spin model. They can be eliminated by means of a (multigrid) a...
1992-11-07
2009-10-22
[ "hep-lat" ]
Arjan Hulsebos
hep-lat/9211017
The Quenched Approximation in Health and in Sickness
We present results for physical quantities computed in quenched chiral perturbation theory and compare them with the corresponding unquenched expressions. We also point out an apparent theoretical problem of the quenched approximation. latex, file espcrc2.sty needed (appended at the end: search for espcrc2.sty).
1992-11-06
2009-10-22
[ "hep-lat" ]
Claude Bernard and Maarten Golterman
hep-lat/9211016
Fermion induced SU$(N)$ Yang-Mills Theory
We investigate the gauge interaction induced by heavy fermions using both dimensional and lattice regularization. We study the condition under which heavy fermions induce a continuum gauge theory.
1992-11-05
2009-10-22
[ "hep-lat" ]
Anna Hasenfratz
hep-lat/9211015
Three-Loop Results on the Lattice
We present some new three-loop results in lattice gauge theories, for the Free Energy and for the Topological Susceptibility. These results are an outcome of a scheme which we are developing (using a symbolic manipulation language), for the analytic computation of renormalization functions on the lattice.
1992-11-05
2009-10-22
[ "hep-lat" ]
B. Alles, M. Campostrini, A. Feo and H. Panagopoulos
hep-lat/9211013
Random Walks with Long-Range Self-Repulsion on Proper Time
We introduce a model of self-repelling random walks where the short-range interaction between two elements of the chain decreases as a power of the difference in proper time. Analytic results on the exponent $\nu$ are obtained. They are in good agreement with Monte Carlo simulations in two dimensions. A numerical study...
1992-11-05
2015-06-25
[ "hep-lat" ]
S. Caracciolo, G. Parisi and A. Pelissetto
hep-lat/9211014
Observation of FSS for a First Order Phase Transition
We present the results of a multicanonical simulation of the q=20 2-d Potts model in the transition region. This is a very strong first order phase transition. We observe, for the first time, the asymptotic finite size scaling behavior predicted by Borgs and Koteck\'y close to a first order phase transition point.
1992-11-05
2009-10-22
[ "hep-lat", "cond-mat" ]
A. Billoire, T. Neuhaus and B. Berg
hep-lat/9211012
Lattice Analysis of Two-Point Hadronic Correlators in the QCD Vacuum
Results from the first lattice QCD analysis of vacuum correlators of local hadronic currents using dispersion relations are presented. We have explored the vector, pseudoscalar, axial, and scalar meson channels, and the proton-like and delta-like baryon channels. The lattice results are shown to agree qualitatively wit...
1992-11-05
2010-05-27
[ "hep-lat" ]
M.-C. Chu, J. M. Grandy, S. Huang, and J. W. Negele
hep-lat/9211011
Lattice Charge Overlap and the Elastic Limit
The results of a lattice simulation of time-separated charge overlap for the charged pion are discussed. The expected result $\sim {\rm exp}[-(E_q - m_{\pi})t\,]$ for large charge density overlap time separations, $t$, is clearly visible in the Fourier transform, indicating that the elastic limit can be achieved at low...
1992-11-04
2009-10-22
[ "hep-lat" ]
Walter Wilcox
hep-lat/9211010
Surface Tension, Surface Stiffness, and Surface Width of the 3-dimensional Ising Model on a Cubic Lattice
We compute properties of the interface of the 3-dimensional Ising model for a wide range of temperatures and for interface extensions up to 64 by 64. The interface tension sigma is obtained by integrating the surface energy density over the inverse temperature beta. The surface stiffness coefficient kappa is determined...
1992-11-04
2009-10-22
[ "hep-lat" ]
Martin Hasenbusch and Klaus Pinn
hep-lat/9211008
Multigrid for propagators of staggered fermions in four-dimensional $SU(2)$ gauge fields
Multigrid (MG) methods for the computation of propagators of staggered fermions in non-Abelian gauge fields are discussed. MG could work in principle in arbitrarily disordered systems. The practical variational MG methods tested so far with a ``Laplacian choice'' for the restriction operator are not competitive with th...
1992-11-04
2016-08-31
[ "hep-lat" ]
Thomas Kalkreuter
hep-lat/9211009
The confined-deconfined interface tension, wetting, and the spectrum of the transfer matrix
The reduced tension $\sigma_{cd}$ of the interface between the confined and the deconfined phase of $SU(3)$ pure gauge theory is determined from numerical simulations of the first transfer matrix eigenvalues. At $T_c = 1/L_t$ we find $\sigma_{cd} = 0.139(4) T_c^2$ for $L_t = 2$. The interfaces show universal behavior b...
1992-11-04
2009-10-22
[ "hep-lat" ]
B. Grossmann, M. L. Laursen, T. Trappenberg and U.-J. Wiese
hep-lat/9211006
A Gauge-fixed Hamiltonian for Lattice QCD
We study the gauge fixing of lattice QCD in 2+1 dimensions, in the Hamiltonian formulation. The technique easily generalizes to other theories and dimensions. The Hamiltonian is rewritten in terms of variables which are gauge invariant except under a single global transformation. This paper extends previous work, invol...
1992-11-03
2009-10-22
[ "hep-lat" ]
J. B. Bronzan and Timothy E. Vaughan
hep-lat/9211007
Finite Size Effects on the QCD Spectrum Revisited
We have continued our study of finite size effects in the QCD spectrum on lattices ranging in size from $8^3\times 24$ to $16^3\times24$. We have increased our statistics for quark mass $am_q=0.025$ for the smallest lattice size. In addition, we have studied quark mass 0.0125 for lattice sizes $12^3\times24$ and $16^3\...
1992-11-03
2012-08-27
[ "hep-lat" ]
The MILC Collaboration: C. Bernard, T. A. DeGrand, C. DeTar, Steven Gottlieb, A. Krasnitz, R. Authors: L. Sugar, and D. Toussaint
hep-lat/9211005
Problems with the Quenched Approximation in the Chiral Limit
In the quenched approximation, loops of the light singlet meson (the $\eta'$) give rise to a type of chiral logarithm absent in full QCD. These logarithms are singular in the chiral limit throwing doubt upon the utility of the quenched approximation. In previous work, I summed a class of diagrams, leading to non-analyt...
1992-11-02
2009-10-22
[ "hep-lat", "hep-ph" ]
Stephen Sharpe
hep-lat/9211002
The Running Coupling from SU(3) Potentials
From an accurate determination of the inter-quark potential, one can study the running coupling constant for a range of $R$-values and hence estimate the scale $\Lambda_{\overline{\rm MS}}$. Detailed results are presented for $SU(3)$ pure gauge theory from a study of a $36^4$ lattice at $\beta=6.5$. (to appear in Proce...
1992-11-02
2019-08-17
[ "hep-lat" ]
UKQCD Collaboration (presented by Chris Michael)
hep-lat/9211004
The Degrees of Freedom in Hot Quenched QCD
In quenched QCD, on lattices with $\nt=4$, the absence of a pole in the pseudoscalar meson channel for $T>T_c$ is demonstrated. A set of effective 4-fermi couplings is extracted. It is observed that this coupling is small in the vector channel for all $T>T_c$, but not in the pseudoscalar channel. The temperature depend...
1992-11-02
2010-11-01
[ "hep-lat", "hep-ph", "nucl-th" ]
Sourendu Gupta
hep-lat/9211001
Pure-gauge SU(2) on large lattices
We have calculated the $q\bar q$ potential over a wide range of lattice separations on a $48^3\cdot56$ lattice at $\beta = 2.85$. We are able to investigate both long-range and (by correcting for the effects of lack of rotational invariance) short-range potentials. From the former we estimate the string tension and fro...
1992-11-02
2019-08-21
[ "hep-lat" ]
UKQCD collaboration (presented by P.W. Stephenson)
hep-lat/9211003
Hadron Spectroscopy with Dynamical Wilson Fermions at beta=5.3
We present results from simulations of lattice QCD using two flavors of dynamical Wilson fermions at a lattice coupling $\beta=5.3$ on $16^3 \times 32$ lattices at two hopping parameters, $\kappa=0.1670$ and $0.1675$, leading to $m_\pi \approx 0.44$ and $0.33$ respectively. We show spectroscopy for S-wave hadrons and c...
1992-11-02
2009-10-22
[ "hep-lat" ]
K. M. Bitar, et.al
hep-lat/9210042
The Isgur-Wise Limit on the Lattice
We construct the Isgur-Wise limit of QCD in a form appropriate to lattice gauge theory techniques. The formulation permits a calculation of heavy quark processes even when the momentum transfers are much larger than the inverse lattice spacing. Applications include semi-leptonic heavy quark decay and scattering process...
1992-10-31
2010-11-01
[ "hep-lat", "hep-ph" ]
Jeffrey E. Mandula and Michael C. Ogilvie
hep-lat/9210041
The Interface Tension in Quenched QCD at the Critical Temperature
We present results for the confinement-deconfinement interface tension $\alpha_{cd}$ of quenched QCD. They were obtained by applying Binder's histogram method to lattices of size $L^2\times L_z\times L_t$ for $L_t=2$ and $L=8,10,12\mbox{ and }14$ with $L_z=30$ for $L=8$ and $L_z=3L$ otherwise. The use of a multicanonic...
1992-10-30
2009-10-22
[ "hep-lat" ]
B. Grossmann, M. L. Laursen, T. Trappenberg, U. J. Wiese
hep-lat/9210039
Perturbative Corrections for Staggered Fermion Bilinears
We calculate the perturbative corrections to fermion bilinears that are used in numerical simulations when extracting weak matrix elements using staggered fermions. This extends previous calculations of Golterman and Smit, and Daniel and Sheard. In particular, we calculate the corrections for non-local bilinears define...
1992-10-30
2014-11-17
[ "hep-lat" ]
Apoorva Patel and Stephen Sharpe
hep-lat/9210038
Gauge invariant extremization
Recently, Duncan and Mawhinney introduced a method to find saddle points of the action in simulations of non-abelian lattice gauge theory. The idea, called `extremization', is to minimize $\int(\delta S/\delta A_\mu)^2$ instead of the action $S$ itself as in conventional `cooling'. The method was implemented in an expl...
1992-10-29
2016-08-31
[ "hep-lat" ]
A.J. van der Sijs
hep-lat/9210040
On reflection positive formulation of chiral gauge theories on a lattice
A formulation of chiral gauge theories on a lattice which is both reflection positive and gauge invariant is discussed.
1992-10-28
2009-10-22
[ "hep-lat" ]
Sergei V. Zenkin
hep-lat/9210036
Meson-Meson Scattering in Lattice QED_2+1
Scattering phase shifts of a meson-meson system in staggered 3-dimensional lattice QED are computed. The main task of the simulation is to obtain a discrete set of two-body energy levels. These are extracted from a 4-point time correlation matrix and then used to obtain scattering phase shifts. The results for the l=0 ...
1992-10-28
2009-10-22
[ "hep-lat" ]
H. R. Fiebig (Physics Department FIU University Park Miami, Florida 33199, USA) and R. M. Woloshyn (TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C., Canada)
hep-lat/9210037
The Shape of Inflated Vesicles
The conformation and scaling properties of self-avoiding fluid vesicles with zero extrinsic bending rigidity subject to an internal pressure increment $\Delta p>0$ are studied using Monte Carlo methods and scaling arguments. With increasing pressure, there is a first-order transition from a collapsed branched polymer p...
1992-10-28
2009-10-22
[ "hep-lat", "cond-mat" ]
G. Gompper and D.M. Kroll
hep-lat/9210035
A better large $N$ expansion for chiral Yukawa models
We consider the most general renormalizable chiral Yukawa model with $SU(3)_{\rm color}$ replaced by $SU(N_c)$, $SU(2)_{\rm L}$ replaced by $SU(N_w )$ and $U(1)_{Y}$ replaced by $U(1)^{N_w -1}$ in the limit $N_c \rightarrow\infty$, $N_w \rightarrow\infty$ with the ratio $\rho=\sqrt{{N_w}\over{N_c}} \ne 0,\infty$ held f...
1992-10-28
2009-10-22
[ "hep-lat", "hep-ph", "hep-th" ]
George Bathas and Herbert Neuberger
hep-lat/9210033
The effective potential and the renormalisation group
We discuss renormalisation group improvement of the effective potential both in general and in the context of $O(N)$ scalar $\p^4$ and the Standard Model. In the latter case we find that absolute stability of the electroweak vacuum implies that $m_H\geq 1.95m_t-189~GeV$, for $\as (M_Z) = 0.11$. We point out that the lo...
1992-10-27
2009-10-22
[ "hep-lat", "hep-ph" ]
C. Ford, D.R.T. Jones, P.W. Stephenson and M.B. Einhorn
hep-lat/9210034
The $I=1$, $J=1$ channel of the O(4) $\lambda \phi^4_4$ theory
A Monte Carlo simulation of the $O(4)$ $\lambda \phi^4$ theory in the broken phase is performed on a hypercubic lattice in search of an $I=1$, $J=1$ resonance. We investigate the region of the cutoff theory where the interaction is strong as it is there that a resonance would be expected to have a better chance to form...
1992-10-27
2009-10-22
[ "hep-lat" ]
Khalil M. Bitar, Pavlos Vranas
hep-lat/9210030
Dual Superconductor Mechanism of Confinement on the Lattice
We investigate the dual superconductor mechanism of confinement for pure SU(2) lattice gauge theory in the maximally abelian gauge. We focus on the the dual Meissner effect. We find that the transverse distribution of the longitudinal chromoelectric field due to a static quark-antiquark pair satisfies the dual London e...
1992-10-26
2008-11-26
[ "hep-lat" ]
P. Cea and L. Cosmai
hep-lat/9210031
Some universal features of the effective string picture of pure gauge theories
The effective string describing the large distance behaviour of the quark sources of gauge field theories in the confining phase in D=3 or D=4 space-time dimensions can be formulated, in the infrared limit, as a suitable 2D conformal field theory on surfaces with quark loops as boundaries. Recent results on self-avoidi...
1992-10-26
2009-10-22
[ "hep-lat", "hep-th" ]
M.Caselle, F.Gliozzi and S.Vinti
hep-lat/9210029
Renormalisation of lattice currents and the calculation of decay constants for dynamical staggered fermions
A numerical calculation of the lattice staggered renormalisation constants at $\beta = 5.35$, $m = 0.01$ is presented. It is seen that there are considerable non-perturbative effects present. As an application the vector decay constant $f_\rho$ is estimated. (LAT92 contribution, one LATEX file with 3 postscript figures...
1992-10-23
2009-10-22
[ "hep-lat" ]
R. Altmeyer, K. D. Born, M. Goeckeler, R. Horsley, E. Laermann and G. Schierholz
hep-lat/9210028
The Savvidy ``ferromagnetic vacuum'' in three-dimensional lattice gauge theory
The vacuum effective potential of three-dimensional SU(2) lattice gauge theory in an applied color-magnetic field is computed over a wide range of field strengths. The background field is induced by an external current, as in continuum field theory. Scaling and finite volume effects are analyzed systematically. The fir...
1992-10-23
2009-10-22
[ "hep-lat", "hep-th" ]
Howard D. Trottier and R. M. Woloshyn
hep-lat/9210032
Regularity Properties and Pathologies of Position-Space Renormalization-Group Transformations
We reconsider the conceptual foundations of the renormalization-group (RG) formalism, and prove some rigorous theorems on the regularity properties and possible pathologies of the RG map. Regarding regularity, we show that the RG map, defined on a suitable space of interactions (= formal Hamiltonians), is always single...
1992-10-22
2015-06-25
[ "hep-lat" ]
A.C.D. van Enter, R. Fernandez and A.D. Sokal
hep-lat/9210026
Regularization dependence of the Higgs mass triviality bound
We calculate the triviality bound on the Higgs mass in scalar field theory models whose global symmetry group $SU(2)_L \times SU(2)_{\rm custodial} \approx O(4)$ has been replaced by $O(N)$ and $N$ has been taken to infinity. Limits on observable cutoff effects at four percent in several regularized models with tunable...
1992-10-22
2009-10-22
[ "hep-lat" ]
Urs M. Heller, Markus Klomfass, Herbert Neuberger and Pavlos Vranas
hep-lat/9210027
Nonperturbative evaluation of the diffusion rate in field theory at high temperatures
Kramer's approach to the rate of the thermally activated escape from a metastable state is extended to field theory. Diffusion rate in the 1+1-dimensional Sine-Gordon model as a function of temperature and friction coefficient is evaluated numerically by solving the Langevin equation in real time. A clear crossover fro...
1992-10-22
2009-10-22
[ "hep-lat" ]
Alexander Bochkarev and Philippe de Forcrand
hep-lat/9210025
Theoretical Analysis of Acceptance Rates in Multigrid Monte Carlo
We analyze the kinematics of multigrid Monte Carlo algorithms by investigating acceptance rates for nonlocal Metropolis updates. With the help of a simple criterion we can decide whether or not a multigrid algorithm will have a chance to overcome critial slowing down for a given model. Our method is introduced in the c...
1992-10-22
2009-10-22
[ "hep-lat" ]
Martin Grabenstein and Klaus Pinn
hep-lat/9210023
Scattering in a Simple 2-d Lattice Model
L\"uscher has suggested a method to determine phase shifts from the finite volume dependence of the two-particle energy spectrum. We apply this to two models in d=2: (a) the Ising model, (b) a system of two Ising fields with different mass and coupled through a 3-point term, both considered in the symmetric phase. The ...
1992-10-21
2009-10-22
[ "hep-lat" ]
C.R. Gattringer, I. Hip and C.B. Lang
hep-lat/9210024
Dual of 3-dimensional pure SU(2) Lattice Gauge Theory and the Ponzano-Regge Model
By carrying out character expansion and integration over all link variables, the partition function of 3-dimensional pure SU(2) lattice gauge theory is rewritten in terms of 6j symbols. The result is Ponzano-Regge model of 3-dimensional gravity with a term that explicitly breaks general coordinate invariance. Conversel...
1992-10-21
2009-10-22
[ "hep-lat", "cond-mat" ]
Ramesh Anishetty, Srinath Cheluvaraja, H.S. Sharatchandra and Manu Mathur
hep-lat/9210021
The String Tension in Gauge Theories: a Suggestion for a New Measurement Method
We discuss a new method for testing confinement and measuring the string tension (in the Coulomb gauge). Our numerical simulations demonstrate that the problems related to Gribov copies are not harmful and that the method is effective in the case of pure gauge Q.C.D.. We discuss the relevance of the method for studying...
1992-10-19
2009-10-22
[ "hep-lat" ]
E. Marinari, M. L. Paciello, G. Parisi and B. Taglienti
hep-lat/9210022
Fermion-Higgs model with strong Wilson-Yukawa coupling in two dimensions
The fermion mass spectrum is studied in the quenched approximation in the strong coupling vortex phase (VXS) of a globally U(1)$_L \otimes$U(1)$_R$ symmetric scalar-fermion model in two dimensions. In this phase fermion doublers can be completely removed from the physical spectrum by means of a strong Wilson-Yukawa cou...
1992-10-19
2009-10-22
[ "hep-lat" ]
Wolfgang Bock, Asit K. De, Erich Focht and Jan Smit
hep-lat/9210020
Intermittency Studies in Directed Bond Percolation
The self-similar cluster fluctuations of directed bond percolation at the percolation threshold are studied using techniques borrowed from inter\-mit\-ten\-cy-related analysis in multi-particle production. Numerical simulations based on the factorial moments for large $1+1$-dimensional lattices allow to handle statisti...
1992-10-16
2008-11-26
[ "hep-lat", "cond-mat", "hep-th" ]
Malte Henkel and Robert Peschanski
hep-lat/9210019
Bosonization and Cluster Updating of Lattice Fermions
A lattice fermion model is formulated in Fock space using the Jordan-Wigner representation for the fermion creation and annihilation operators. The resulting path integral is a sum over configurations of lattice site occupation numbers $n(x,t) = 0,1$ which may be viewed as bosonic Ising-like variables. However, as a re...
1992-10-16
2009-10-22
[ "hep-lat", "cond-mat" ]
Uwe-Jens Wiese (Universit\"at Bern)
hep-lat/9210017
Lee-Yang Zeroes and Logarithmic Corrections in the $\Phi^4_4$ Theory
The leading mean-field critical behaviour of $\phi^4_4$-theory is modified by multiplicative logarithmic corrections. We analyse these corrections both analytically and numerically. In particular we present a finite-size scaling theory for the Lee-Yang zeroes and temperature zeroes, both of which exhibit logarithmic co...
1992-10-13
2009-10-22
[ "hep-lat" ]
R. Kenna and C.B. Lang
hep-lat/9210018
The Kaon $B$-parameter with Wilson Fermions
We calculate the kaon $B$-parameter in quenched lattice QCD at $\beta=6.0$ using Wilson fermions at $\kappa=0.154$ and $0.155$. We use two kinds of non-local (``smeared'') sources for quark propagators to calculate the matrix elements between states of definite momentum. The use of smeared sources yields results with m...
1992-10-13
2009-10-22
[ "hep-lat" ]
Gupta, Daniel, Kilcup, Patel and Sharpe
hep-lat/9210016
Improvement of efficiency in generating random $U(1)$ variables with Boltzmann distribution
A method for generating random $U(1)$ variables with Boltzmann distribution is presented. It is based on the rejection method with transformation of variables. High efficiency is achieved for all range of temparatures or coupling parameters, which makes the present method especially suitable for parallel and pipeline v...
1992-10-10
2009-10-22
[ "hep-lat" ]
Tetsuya Hattori and Hideo Nakajima
hep-lat/9210014
The U(1)-Higgs Model: Critical Behaviour in the Confinig-Higgs region
We study numerically the critical properties of the U(1)-Higgs lattice model, with fixed Higgs modulus, in the region of small gauge coupling where the Higgs and Confining phases merge. We find evidence of a first order transition line that ends in a second order point. By means of a rotation in parameter space we intr...
1992-10-09
2008-11-26
[ "hep-lat" ]
Alonso, Azcoiti, Campos, Ciria, Cruz, Iniguez, lesmes, Piedrafita, Rivero, Tarancon, Badoni, Fernandez, Munoz Sudupe, Ruiz Lorenzo, Gonzalez Arroyo, Martinez, Pech and Tellez
hep-lat/9210015
The nature of the continuum limit in strongly coupled quenched QED
We review the results of large scale simulations of noncompact quenched $QED$ which use spectrum and Equation of State calculations to determine the theory's phase diagram, critical indices, and continuum limit. The resulting anomalous dimensions are in good agreement with Schwinger-Dyson solutions of the ladder graphs...
1992-10-09
2009-10-22
[ "hep-lat", "hep-ph" ]
Mp Lombardo, J.B. Kogut, A. Kocic and K.C. Wang
hep-lat/9210011
$1/N$ Expansion of Two-Dimensional Models in the Scaling Region
The main technical and conceptual features of the lattice $1/N$ expansion in the scaling region are discussed in the context of a two-parameter two-dimensional spin model interpolating between $CP^{N-1}$ and $O(2N)$ $\sigma$ models, with standard and improved lattice actions. We show how to perform the asymptotic expan...
1992-10-08
2009-10-22
[ "hep-lat" ]
Massimo Campostrini and Paolo Rossi
hep-lat/9210010
Scaling and asymptotic scaling in two-dimensional $CP^{N-1}$ models
Two-dimensional $CP^{N-1}$ models are investigated by Monte Carlo methods on the lattice, for values of $N$ ranging from 2 to 21. Scaling and rotation invariance are studied by comparing different definitions of correlation length $\xi$. Several lattice formulations are compared and shown to enjoy scaling for $\xi$ as ...
1992-10-08
2009-10-22
[ "hep-lat" ]
Massimo Campostrini, Paolo Rossi, and Ettore Vicari
hep-lat/9210012
Topological susceptibility and string tension in CP(N-1) models
We investigate the features of ${\rm CP}^{N-1}$ models concerning confinement and topology. In order to study the approach to the large-$N$ asymptotic regime, we determine the topological susceptibility and the string tension for a wide range of values of $N$, in particular $N=4,10,21,41$. Quantitative agreement with t...
1992-10-08
2009-10-22
[ "hep-lat" ]
Massimo Campostrini, Paolo Rossi, and Ettore Vicari (Dipartimento di Fisica dell'Universit\`a and Istituto Nazionale di Fisica Nucleare, I-56126 Pisa, Italy)
hep-lat/9210013
Wave functions and their use in spectroscopy and phenomenology
We describe the calculation of Coulomb gauge wave functions for light quark systems, and their use as interpolating fields for excited state spectroscopy.
1992-10-08
2009-10-22
[ "hep-lat" ]
T. DeGrand and M. Hecht
hep-lat/9210009
Renormalization Group Analysis of Finite-Size Scaling in the $\Phi^4_4$ Model
A finite-size scaling theory for the $\phi^4_4$ model is derived using renormalization group methods. Particular attention is paid to the partition function zeroes, in terms of which all thermodynamic observables can be expressed. While the leading scaling behaviour is identical to that of mean field theory, there exis...
1992-10-07
2009-10-22
[ "hep-lat" ]
R. Kenna and C.B. Lang
hep-lat/9210008
SU(N) Gauge Theories with C-Periodic Boundary Conditions: II. Small Volume Dynamics
The dynamics of SU(N) gauge theories, especially for N=3, in a small C-periodic box are investigated. We identify the fields that mimimize the energy---the torons---and determine which of these ``classical'' vacua are stable quantum mechanically. The stable torons break cubic symmetry, which has interesting consequence...
1992-10-07
2009-10-22
[ "hep-lat", "hep-th" ]
A.S. Kronfeld and U.-J. Wiese
hep-lat/9210007
The infrared limit of QCD effective string
Some model-independent properties of the effective string of gauge field systems in the confining phase , for very large quark separations, are described in terms of two-dimensional conformal field theories. The constraints induced by the gauge theory at the boundaries of the effective string induce a Coulomb- like ter...
1992-10-06
2011-04-15
[ "hep-lat" ]
F.Gliozzi