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The Standard Model and the Lattice: The $SU(3)\otimes SU(2) \otimes U(1)$ standard model maps smoothly onto a
conventional lattice gauge formulation, including the parity violation of the
weak interactions. The formulation makes use of the pseudo-reality of the weak
group and requires the inclusion a full generation of... | hep-lat |
Reducing cutoff effects in maximally twisted lattice QCD close to the
chiral limit: When analyzed in terms of the Symanzik expansion, lattice correlators of
multi-local (gauge-invariant) operators with non-trivial continuum limit
exhibit in maximally twisted lattice QCD ``infrared divergent'' cutoff effects
of the ty... | hep-lat |
The Phase Diagram of 2 flavour QCD with improved Actions: It has been proposed, that the chiral continuum limit of 2-flavour QCD with
Wilson fermions is brought about by a phase in which flavour and parity
symmetry are broken spontaneously at finite lattice spacing. At finite
temperature this phase should retract from ... | hep-lat |
Renormalization of the effective theory for heavy quarks at small
velocity: The slope of the Isgur-Wise function at the normalization point,
$\xi^{(1)}(1)$,is one of the basic parameters for the extraction of the $CKM$
matrix element $V_{cb}$ from exclusive semileptonic decay data. A method for
measuring this paramet... | hep-lat |
A new framework to tune an improved relativistic heavy-quark action: We introduce a new non-perturbative method to tune the parameters of the
Columbia formulation of an anisotropic, clover-improved relativistic
heavy-quark (RHQ) action. By making use of suitable observables which can be
computed at a sequence of heavy-... | hep-lat |
Update on onium masses with three flavors of dynamical quarks: We update results presented at Lattice 2005 on charmonium masses. New
ensembles of gauge configurations with 2+1 flavors of improved staggered quarks
have been analyzed. Statistics have been increased for other ensembles. New
results are also available for ... | hep-lat |
Chiral logs in twisted mass lattice QCD with large isospin breaking: The pion masses and the pion decay constant are calculated to 1-loop order in
twisted mass Wilson chiral perturbation theory, assuming a large pion mass
splitting and tuning to maximal twist. Taking the large mass splitting at
leading order in the chi... | hep-lat |
Improving center vortex detection by usage of center regions as guidance
for the direct maximal center gauge: The center vortex model of quantum chromodynamic states that vortices, closed
color-magnetic flux, percolate the vacuum. Vortices are seen as the relevant
excitations of the vacuum, causing confinement and dy... | hep-lat |
Quenched charmonium near the continuum limit: We study relativistic charmonium on very fine quenched lattices (beta=6.4 and
6.6). We concentrate on the calculation of the hyperfine splitting between
eta_c and J/psi, aiming for a controlled continuum extrapolation of this
quantity. Results for the eta_c and J/psi wave f... | hep-lat |
Non-Gaussian fixed point in four-dimensional pure compact U(1) gauge
theory on the lattice: The line of phase transitions, separating the confinement and the Coulomb
phases in the four-dimensional pure compact U(1) gauge theory with extended
Wilson action, is reconsidered. We present new numerical evidence that a par... | hep-lat |
Particle Projection Using a Complex Langevin Method: Using complex stochastic quantization, we implement a particle-number
projection technique on the partition function of spin-1/2 fermions at finite
temperature on the lattice. We discuss the method, its application towards
obtaining the thermal properties of finite F... | hep-lat |
Chiral phase transition in a random matrix model with three flavors: The chiral phase transition in the conventional random matrix model is the
second order in the chiral limit, irrespective of the number of flavors N_f,
because it lacks the U_A(1)-breaking determinant interaction term. Furthermore,
it predicts an unph... | hep-lat |
$B_s$-$\bar{B_s}$ mixing from lattice QCD: We study the $B^0_s-\bar{B^0_s}$ mixing amplitude in Standard Model by
computing the relevant hadronic matrix element in the static limit of lattice
HQET with the Neuberger light quark action. In the quenched approximation, and
after matching to the $\bar{\rm MS}$ scheme in QC... | hep-lat |
Domain wall fermion zero modes on classical topological backgrounds: The domain wall approach to lattice fermions employs an additional dimension,
in which gauge fields are merely replicated, to separate the chiral components
of a Dirac fermion. It is known that in the limit of infinite separation in
this new dimension... | hep-lat |
Exploring the Spectrum of QCD using the Lattice: The calculation of the spectrum of QCD is key to an understanding of the
strong interactions, and vital if we are to capitalize on the experimental
study of the spectrum. In this paper, we describe progress towards
understanding the spectrum of resonances of both mesons ... | hep-lat |
Locality of staggered overlap operators: We give an explicit proof for the locality of staggered overlap operators.
The proof covers the original two flavor construction by Adams as well as a
single flavor version. As in the case of Neuberger's operator, an admissibility
condition for the gauge fields is required. | hep-lat |
Gradient flow step-scaling function for SU(3) with ten fundamental
flavors: We calculate the step scaling function, the lattice analog of the
renormalization group $\beta$-function, for an SU(3) gauge theory with ten
fundamental flavors. We present a detailed analysis including the study of
systematic effects of our ... | hep-lat |
High-degree Polynomial Noise Subtraction: In lattice QCD, the calculation of physical quantities from disconnected
quark loop calculations have large variance due to the use of Monte Carlo
methods for the estimation of the trace of the inverse lattice Dirac operator.
In this work, we build upon our POLY and HFPOLY vari... | hep-lat |
Critical Behaviour in the Single Flavor Thirring Model in 2+1d: Results of a lattice field theory simulation of the single-flavor Thirring
model in 2+1 spacetime dimensions are presented. The lattice model is
formulated using domain wall fermions as a means to recover the correct U(2)
symmetries of the continuum model ... | hep-lat |
SU(3) Deconfinement in (2+1)d from Twisted Boundary Conditions and
Self-Duality: We study the pure SU(3) gauge theory in 2+1 dimensions on the lattice using
't Hooft's twisted boundary conditions to force non-vanishing center flux
through the finite volume. In this way we measure the free energy of spacelike
center v... | hep-lat |
Delta expansion and Wilson fermion in the Gross-Neveu model:
Compatibility with linear divergence and continuum limit from inverse-mass
expansion: We apply the $\delta$-expansion to the Gross-Neveu model in the large $N$
limit with Wilson fermion and investigate dynamical mass generation from
inverse-mass expansion... | hep-lat |
(2+1)-flavor QCD Thermodynamics from the Gradient Flow: Recently, we proposed a novel method to define and calculate the
energy-momentum tensor (EMT) in lattice gauge theory on the basis of the
Yang-Mills gradient flow [1]. In this proceedings, we summarize the basic idea
and technical steps to obtain the bulk thermody... | hep-lat |
Twist-3 partonic distributions from lattice QCD: Twist-3 partonic distributions contain important information that
characterizes nucleon's structure. In this work, we show our lattice
exploration of the twist-3 PDFs $g_T(x)$, and $h_L(x)$. We also present our
preliminary results on the twist-3 GPD $\tilde{G}_2(x)$. We ... | hep-lat |
Light meson masses and decay constants in 2+1 flavour domain wall QCD: We present results for light meson masses and psedoscalar meson decay
constants in 2+1 flavour domain wall QCD with the DBW2 and Iwasaki gauge
actions, using lattices with linear sizes in the range 1.6 to 2.2fm and $u$ and
$d$ quark masses as low as... | hep-lat |
Hopping Parameter Expansion for Heavy-Light Systems: We present a technique which permits the calculation of two-point functions
of operators containing one heavy quark and an arbitrary number of light quarks
as analytic functions of the heavy-quark mass. It is based on the standard
Jacobi linear solver used for the ca... | hep-lat |
Can Sigma Models Describe Finite Temperature Chiral Transitions?: Large-N expansions and computer simulations indicate that the universality
class of the finite temperature chiral symmetry restoration transition in the
3D Gross-Neveu model is mean field theory. This is a counterexample to the
standard 'sigma model' sce... | hep-lat |
The non-perturbative part of the plaquette in quenched QCD: We define the non-perturbative part of a quantity as the difference between
its numerical value and the perturbative series truncated by dropping the order
of minimal contribution and the higher orders. For the anharmonic oscillator,
the double-well potential ... | hep-lat |
Study of SU(2) gauge theories with multiple Higgs fields in different
representations: We study two different SU(2) gauge-scalar theories in 3 and 4 spacetime
dimensions. Firstly, we focus on the 3 dimensional SU(2) theory with multiple
Higgs fields in the adjoint representation, that can be mapped to cuprate
systems... | hep-lat |
A strategy to study the role of the charm quark in explaining the
Delta{I}=1/2 rule: We present a strategy designed to separate several possible origins of the
well-known enhancement of the Delta{I}=1/2 amplitude in non-leptonic kaon
decays. In particular, we seek to disentangle the contribution of physics at
the typ... | hep-lat |
$ Δ$ baryon spectroscopy in lattice QCD: A variational analysis is performed within the framework of lattice QCD to
extract the masses of the spin-3/2 positive parity $ \Delta^+ $ baryons,
including radial excitations. $2+1$ flavour dynamical gauge-field
configurations provided by the PACS-CS collaboration via the ILDG... | hep-lat |
Review on Composite Higgs Models: Composite Higgs Models explore the possibility that the Higgs boson is an
excitation of a new strongly interacting sector giving rise to electro-weak
symmetry breaking. After describing how this new sector can be embedded into
the Standard Model of elementary particle physics meeting e... | hep-lat |
Neural multigrid for gauge theories and other disordered systems: We present evidence that multigrid works for wave equations in disordered
systems, e.g. in the presence of gauge fields, no matter how strong the
disorder, but one needs to introduce a "neural computations" point of view into
large scale simulations: Fir... | hep-lat |
New lattice approaches to the $ΔI=1/2$ rule: Lattice QCD should allow a derivation of the $\Delta I=1/2$ rule from first
principles, but numerical calculations to date have been plagued by a variety
of problems. After a brief review of these problems, we present several new
methods for calculating $K\to\pi\pi$ amplitud... | hep-lat |
Quark-gluon vertex with an off-shell O(a)-improved chiral fermion action: We perform a study the quark-gluon vertex function with a quenched Wilson
gauge action and a variety of fermion actions. These include the domain wall
fermion action (with exponentially accurate chiral symmetry) and the Wilson
clover action both ... | hep-lat |
Frontiers of finite temperature lattice QCD: I review a selection of recent finite temperature lattice results of the past
years. First I discuss the extension of the equation of state towards high
temperatures and fi- nite densities, then I show recent results on the QCD
topological susceptibility at high temperatures... | hep-lat |
Recent results in high temperature lattice gauge theories: We review some analytic results on the deconfinement transition in pure
lattice gauge theories. In particular we discuss the relationship between the
deconfinement transition in the $(d+1)$-dimensional $SU(2)$ model and the
magnetization transition in the $d$-d... | hep-lat |
Non-perturbative parton mass for the gluon: A gauge invariant, non-local observable is constructed in pure gauge theory,
which is identical to the gluon propagator in a particular gauge, permitting to
define a non-perturbative parton mass for the gluon. This mass can be shown to
be related to the 1P-1S mass splitting o... | hep-lat |
Subtleties and Fancies in Gauge Theory Non Trivial Vacuum: The one loop effective potential for a non-Abelian gauge configuration is
analyzed using the background field method. The Savvidy result and the
non-Abelian ansatz, the other alternative possible background that generates a
constant color magnetic field configu... | hep-lat |
The Weak-Coupling Limit of 3D Simplicial Quantum Gravity: We investigate the weak-coupling limit, kappa going to infinity, of 3D
simplicial gravity using Monte Carlo simulations and a Strong Coupling
Expansion. With a suitable modification of the measure we observe a transition
from a branched polymer to a crinkled pha... | hep-lat |
The three-dimensional, three-state Potts Model in an External Field: We analyze the critical behaviour of the three-dimensional, three-state Potts
model in the presence of an external ordering field. From a finite size scaling
analysis on lattices of size up to 70**3 we determine the critical endpoint of
the line of fi... | hep-lat |
Color Structure of Gluon Field Magnetic Mass: The color structure of the gluon field magnetic mass is investigated in the
lattice SU(2) gluodynamics. To realize that, the interaction between a
monopole-antimonopole string and external neutral Abelian chromomagnetic field
flux is considered. The string is introduced in ... | hep-lat |
Polyakov loop fluctuations in SU(3) lattice gauge theory and an
effective gluon potential: We calculate the Polyakov loop susceptibilities in the SU(3) lattice gauge
theory using the Symanzik improved gauge action on different-sized lattices.
The longitudinal and transverse fluctu- ations of the Polyakov loop, as wel... | hep-lat |
Color screening potential at finite density in two-flavor lattice QCD
with Wilson fermions: We investigate chemical-potential (\mu) dependence of static-quark free
energies in both the real and imaginary \mu regions, performing lattice QCD
simulations at imaginary \mu and extrapolating the results to the real \mu
reg... | hep-lat |
The chiral phase transition for QCD with sextet quarks: QCD with 2 massless colour-sextet quarks is studied as a model of Walking
Technicolor. We simulate lattice QCD with 2 light color-sextet staggered quarks
at finite temperature, and use the dependence of the coupling at the chiral
transition on the temporal extent,... | hep-lat |
$B_s \to K \ell ν$ form factors from lattice QCD: We report the first lattice QCD calculation of the form factors for the
standard model tree-level decay $B_s\to K \ell\nu$. In combination with future
measurement, this calculation will provide an alternative exclusive
semileptonic determination of $|V_{ub}|$. We compar... | hep-lat |
Low-energy Scattering and Effective Interactions of Two Baryons at
$m_π\sim 450$ MeV from Lattice Quantum Chromodynamics: The interactions between two octet baryons are studied at low energies using
lattice QCD (LQCD) with larger-than-physical quark masses corresponding to a
pion mass of $m_{\pi}\sim 450$ MeV and a k... | hep-lat |
Heavy quark free energies for three quark systems at finite temperature: We study the free energy of static three quark systems in singlet, octet,
decuplet and average color channels in the quenched approximation and in
2-flavor QCD at finite temperature. We show that in the high temperature phase
singlet and decuplet ... | hep-lat |
Axial Charges of Octet Baryons in Two-flavor Lattice QCD: We evaluate the strangeness-conserving $N N$, $\Sigma\Sigma$, $\Xi\Xi$,
$\Lambda\Sigma$ and the strangeness-changing $\Lambda N$, $\Sigma N$,
$\Lambda\Xi$, $\Sigma\Xi$ axial charges in lattice QCD with two flavors of
dynamical quarks and extend our previous work... | hep-lat |
f_B and the Heavy-light Spectrum from NRQCD: The present status of lattice calculations of the B spectrum and f_B, using
NRQCD for the b quark, is discussed. | hep-lat |
CL2QCD - Lattice QCD based on OpenCL: We present the Lattice QCD application CL2QCD, which is based on OpenCL and
can be utilized to run on Graphic Processing Units as well as on common CPUs.
We focus on implementation details as well as performance results of selected
features. CL2QCD has been successfully applied in ... | hep-lat |
The (LATTICE) QCD Potential and Running Coupling: How to Accurately
Interpolate between Multi-Loop QCD and the String Picture: We present a simple parameterization of a running coupling constant, defined
via the static potential, that interpolates between 2-loop QCD in the UV and
the string prediction in the IR. Besi... | hep-lat |
The QCD Equation of State: Results for the equation of state in 2+1 flavor QCD at zero net baryon
density using the Highly Improved Staggered Quark (HISQ) action by the HotQCD
collaboration are presented. The strange quark mass was tuned to its physical
value and the light (up/down) quark masses fixed to $m_l = 0.05m_s... | hep-lat |
Chiral gauge theories on the lattice without gauge fixing?: We discuss two proposals for a non-perturbative formulation of chiral gauge
theories on the lattice. In both cases gauge symmetry is broken by the
regularization. We aim at a dynamical restoration of symmetry. If the gauge
symmetry breaking is not too severe t... | hep-lat |
Higgs boson mass bounds in the presence of a very heavy fourth quark
generation: We study the effect of a potential fourth quark generation on the upper and
lower Higgs boson mass bounds. This investigation is based on the numerical
evaluation of a chirally invariant lattice Higgs-Yukawa model emulating the
same Higg... | hep-lat |
Pion Polarizabilities and Volume Effects in Lattice QCD: We use chiral perturbation theory to study the extraction of pion
electromagnetic polarizabilities from lattice QCD. Chiral extrapolation
formulae are derived for partially quenched QCD, and quenched QCD simulations.
On a torus, volume dependence of electromagnet... | hep-lat |
Spectral functions at small energies and the electrical conductivity in
hot, quenched lattice QCD: In lattice QCD, the Maximum Entropy Method can be used to reconstruct
spectral functions from euclidean correlators obtained in numerical
simulations. We show that at finite temperature the most commonly used
algorithm,... | hep-lat |
Calculation of $ρ$ meson decay width from the PACS-CS configurations: We present preliminary results on the $\rho$ meson decay width from $N_f=2+1$
full QCD configurations generated by PACS-CS Collaboration. The decay width is
estimated from the $P$-wave scattering phase shift for the isospin $I=1$
two-pion system. The... | hep-lat |
Testing universality and the fractional power prescription for the
staggered fermion determinant: In [Phys.Rev.Lett.92:162002 (2004), hep-lat/0312025] expressions for the
continuous Euclidean time limits of various lattice fermion determinants were
derived and compared in order to test universality expectations in La... | hep-lat |
Fast algorithms for simulating chiral fermions in U(1)lattice gauge
theory: In order to develop fast inversion algorithms we have used overlap solvers in
two dimensions. Lattice QED theory with U(1) group symmetry in two dimensional
space-times dimensions has always been a testing ground for algorithms. By the
other ... | hep-lat |
Formulation of chiral gauge theories: We present a formulation of chiral gauge theories, which admits more general
spectra of Dirac operators and reveals considerably more possibilities for the
structure of the chiral projections. Our two forms of correlation functions
both also apply in the presence of zero modes and ... | hep-lat |
Center-symmetric dimensional reduction of hot Yang-Mills theory: It is expected that incorporating the center symmetry in the conventional
dimensionally reduced effective theory for high-temperature SU(N) Yang-Mills
theory, EQCD, will considerably extend its applicability towards the
deconfinement transition. The const... | hep-lat |
Radially Excited States of 1P Charmonia and X(3872): The excited states of charmonia are numerically investigated in quenched
lattice QCD with improved gauge and Wilson fermion actions formulated on
anisotropic lattices. Through a constrained curve fitting algorithm, the masses
of the first excited states in $0^{++}$, ... | hep-lat |
Three-Flavor Partially Quenched Chiral Perturbation Theory at NNLO for
Meson Masses and Decay Constants: We discuss Partially Quenched Chiral Perturbation Theory (PQ$\chi$PT) and
possible fitting strategies to Lattice QCD data at next-to-next-to-leading
order (NNLO) in the mesonic sector. We also present a complete c... | hep-lat |
Axial Anomaly in Lattice Abelian Gauge Theory in Arbitrary Dimensions: Axial anomaly of lattice abelian gauge theory in hyper-cubic regular lattice
in arbitrary even dimensions is investigated by applying the method of exterior
differential calculus. The topological invariance, gauge invariance and
locality of the axia... | hep-lat |
The finite temperature transition for 3-flavour lattice QCD at finite
isospin density: We simulate 3-flavour lattice QCD with a small chemical potential $\mu_I$ for
isospin, at temperatures close to the finite temperature transition. Using
quark masses just above the critical mass for zero chemical potential, we
dete... | hep-lat |
Physics From Breit-Frame Regularization Of a Lattice Hamiltonian: We suggest a Hamiltonian formulation on a momentum lattice using a physically
motivated regularization using the Breit-frame which links the maximal parton
number to the lattice size. This scheme restricts parton momenta to positive
values in each spatia... | hep-lat |
Stabilizing the electroweak vacuum by higher dimensional operators in a
Higgs-Yukawa model: The Higgs boson discovery at the LHC with a mass of approximately 126 GeV
suggests, that the electroweak vacuum of the standard model may be metastable
at very high energies. However, any new physics beyond the standard model ... | hep-lat |
The chiral transition in two-flavor QCD: QCD with N_f=2 is a specially interesting system to investigate the chiral
transition. The order of the transition has still not been established. We
report the results of an in-depth numerical investigation performed with
staggered fermions on lattices with L_t=4 and L_s=12,16,... | hep-lat |
Nucleon form factors and structure functions with N_f=2+1 dynamical
domain wall fermions: We report isovector form factors and low moments of structure functions of
nucleon in numerical lattice quantum chromodynamics (QCD) from the on-going
calculations by the RIKEN-BNL-Columbia (RBC) and UKQCD Collaborations with
(2... | hep-lat |
Form factor for Dalitz decays from $J/ψ$ to light pseudoscalars: We calculate the form factor $M(q^2)$ for the Dalitz decay $J/\psi\to
\gamma^*(q^2)\eta_{(N_f=1)}$ with $\eta_{(N_f)}$ being the SU($N_f$) flavor
singlet pseudoscalar meson. The difference among the partial widths
$\Gamma(J/\psi\to \gamma \eta_{(N_f)})$ a... | hep-lat |
Noise, sign problems, and statistics: We show how sign problems in simulations of many-body systems can manifest
themselves in the form of heavy-tailed correlator distributions, similar to
what is seen in electron propagation through disordered media. We propose an
alternative statistical approach for extracting ground... | hep-lat |
The critical end point in QCD: In this talk I present the logic behind, and examine the reliability of,
estimates of the critical end point (CEP) of QCD using the Taylor expansion
method. | hep-lat |
The principle of indirect elimination: The principle of indirect elimination states that an algorithm for solving
discretized differential equations can be used to identify its own
bad-converging modes. When the number of bad-converging modes of the algorithm
is not too large, the modes thus identified can be used to s... | hep-lat |
Excited mesons from $N_f=2$ dynamical Clover Wilson lattices: We study mesons on the lattice with a special focus on excited states. For
that purpose we construct several quark sources with different spatial
smearings, including p-waves. These quark sources are then combined with the
appropiate Dirac structures to form... | hep-lat |
$B_K$ with improved staggered fermions: analysis using SU(2) staggered
chiral perturbation theory: We report updated results for $B_K$ calculated using HYP-smeared staggered
fermions on the MILC asqtad 2+1 flavor lattices. We use four different lattice
spacings ($a \approx$ 0.12, 0.09, 0.06 and 0.045 fm) to control t... | hep-lat |
Critical Exponents of the 3D Ising Universality Class From Finite Size
Scaling With Standard and Improved Actions: We propose a method to obtain an improved Hamiltonian (action) for the Ising
universality class in three dimensions. The improved Hamiltonian has suppressed
leading corrections to scaling. It is obtained... | hep-lat |
The QCD phase diagram at nonzero quark density: We determine the phase diagram of QCD on the \mu-T plane for small to
moderate chemical potentials. Two transition lines are defined with two
quantities, the chiral condensate and the strange quark number susceptibility.
The calculations are carried out on N_t =6,8 and 10... | hep-lat |
The $ρ$-resonance with physical pion mass from $N_f=2$ lattice QCD: We present the first-ever lattice computation of pi pi-scattering in the I=1
channel with Nf=2 dynamical quark flavours obtained including an ensemble with
physical value of the pion mass. Employing a global fit to data at three values
of the pion mass... | hep-lat |
The Charmonium Potential at Non-Zero Temperature: The potential between charm and anti-charm quarks is calculated
non-perturbatively using physical, rather than static quarks at temperatures on
both sides of the deconfinement transition $T_{\rm C}$, using a lattice
simulation with 2+1 dynamical quark flavours. We used ... | hep-lat |
A Study of the $N=2$ Kazakov-Migdal Model: We study numerically the SU(2) Kazakov-Migdal model of `induced QCD'. In
contrast to our earlier work on the subject we have chosen here {\it not} to
integrate out the gauge fields but to keep them in the Monte Carlo simulation.
This allows us to measure observables associated... | hep-lat |
Lattice Artefacts In The Non-Abelian Debye Screening Mass In One Loop
Order: We compute the electric screening mass in lattice QCD with Wilson fermions at
finite temperature and chemical potential to one-loop order, and show that
lattice artefacts arising from a finite lattice spacing result in an
enhancement of the ... | hep-lat |
$O(a^2)$-improved actions for heavy quarks and scaling studies on
quenched lattices: We investigate a new class of improved relativistic fermion action on the
lattice with a criterion to give excellent energy-momentum dispersion relation
as well as to be consistent with tree-level $O\left(a^{2}\right)$-improvement.
M... | hep-lat |
Excited States of U(1)$_{2+1}$ Lattice Gauge Theory from Monte Carlo
Hamiltonian: We address an old problem in lattice gauge theory - the computation of the
spectrum and wave functions of excited states. Our method is based on the
Hamiltonian formulation of lattice gauge theory. As strategy, we propose to
construct a... | hep-lat |
THE QCD ABACUS: A New Formulation for Lattice Gauge Theories: A quantum Hamiltonian is constructed for SU(3) lattice QCD entirely from
color triplet Fermions --- the standard quarks and a new Fermionic
``constituent'' of the gluon we call ``rishons''. The quarks are represented by
Dirac spinors on each site and the gau... | hep-lat |
Numerical tests of the electroweak phase transition and thermodynamics
of the electroweak plasma: The finite temperature phase transition in the SU(2) Higgs model at a Higgs
boson mass $M_H \simeq 34$ GeV is studied in numerical simulations on
four-dimensional lattices with time-like extensions up to $L_t=5$. The eff... | hep-lat |
Landau gauge gluon and ghost propagators from two-flavor lattice QCD at
T > 0: In this contribution we extend our unquenched computation of the Landau gauge
gluon and ghost propagators in lattice QCD at non-zero temperature. The study
was aimed at providing input for investigations employing continuum functional
meth... | hep-lat |
Massless Fermions on the Lattice: We consider a nonlocal lattice action for fermions fermion doubling in
lattice theories. It is shown, that it is possible to avoid the fermionic
doubling in the case of free fermions, but this approach does not reproduce
results for the effective action for gauge fields in the continuu... | hep-lat |
The pion form factor on the lattice at zero and finite temperature: We calculate the electromagnetic form factor of the pion in quenched lattice
QCD. The non-perturbatively improved Sheikoleslami-Wohlert lattice action is
used together with the consistently O(a) improved current. We calculate the
pion form factor for m... | hep-lat |
Disconnected contributions to D-meson semi-leptonic decay form factors: We calculate the disconnected contribution to the form factor for the
semileptonic decay of a D-meson into a final state, containing a flavor singlet
eta meson. We use QCDSF n_f=2+1 configurations at the flavor symmetric point
m_u=m_d=m_s and the p... | hep-lat |
Finite Size Scaling and ``perfect'' actions: the three dimensional Ising
model: Using Finite-Size Scaling techniques, we numerically show that the first
irrelevant operator of the lattice $\lambda\phi^4$ theory in three dimensions
is (within errors) completely decoupled at $\lambda=1.0$. This interesting
result also ... | hep-lat |
K \to ππdecay amplitudes from the lattice: In order to directly compute physical two-pion K-decay amplitudes using
lattice methods we must prepare a two-pion state with non-zero relative
momentum. Building upon a proposal of Lellouch and L\"uscher, we describe a
finite-volume method to realize such a state as the lowes... | hep-lat |
Linear broadening of the confining string in Yang-Mills theory at low
temperature: The logarithmic broadening predicted by the systematic low-energy effective
field theory for the confining string has recently been verified in numerical
simulations of (2+1)-d SU(2) lattice Yang-Mills theory at zero temperature. The
s... | hep-lat |
Accelerating lattice QCD simulations with 2 flavours of staggered
fermions on multiple GPUs using OpenACC - a first attempt: We present the results of an effort to accelerate a Rational Hybrid Monte
Carlo (RHMC) program for lattice quantum chromodynamics (QCD) simulation for 2
flavours of staggered fermions on multip... | hep-lat |
Phase diagram of QCD in strong background magnetic field: We discuss the phase diagram of QCD in the presence of a strong background
magnetic field, providing numerical evidence, based on lattice simulations of
QCD with $2+1$ flavours and physical quark masses, that the QCD crossover turns
into a first order phase tran... | hep-lat |
Gauge Invariance and Confinement in Noncompact Simulations of SU(2): Wilson loops have been measured at strong coupling, $\beta=0.5$, on a $12^4$
lattice in a noncompact simulation of pure SU(2) in which random compact gauge
transformations impose a kind of lattice gauge invariance. The Wilson loops
suggest a confining... | hep-lat |
The 't Hooft-Veneziano limit of the Polyakov loop models: The broad class of U(N) and SU(N) Polyakov loop models on the lattice are
solved exactly in the combined large N, Nf limit, where N is a number of colors
and Nf is a number of quark flavors, and in any dimension. In this 't
Hooft-Veneziano limit the ratio N/Nf i... | hep-lat |
Charmonium Potentials at Finite Temperature: The charmonium states at non-zero temperature are studied on anisotropic
lattices with 2 dynamical quark flavours. Non-local operators are used to
determine the Nambu-Bethe-Salpeter (NBS) wavefunctions via both conventional
fitting methods and the Maximum Entropy Method. The... | hep-lat |
A Connection Between Complex-Temperature Properties of the 1D and 2D
Spin $s$ Ising Model: Although the physical properties of the 2D and 1D Ising models are quite
different, we point out an interesting connection between their
complex-temperature phase diagrams. We carry out an exact determination of the
complex-tem... | hep-lat |
Repairing Stevenson's step in the 4d Ising model: In a recent paper Stevenson claimed that analysis of the data on the wave
function renormalization constant near the critical point of the 4d Ising model
is not consistent with analytical expectations. Here we present data with
improved statistics and show that the resu... | hep-lat |
High Spin Glueballs from the Lattice: We discuss the principles underlying higher spin glueball calculations on the
lattice. For that purpose, we develop numerical techniques to rotate Wilson
loops by arbitrary angles in lattice gauge theories close to the continuum. As
a first application, we compute the glueball spec... | hep-lat |
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