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B Meson Semileptonic Form Factors from Unquenched Lattice QCD: The semileptonic process, B --> \pi l \nu, is studied via full QCD Lattice
simulations. We use unquenched gauge configurations generated by the MILC
collaboration. These include the effect of vacuum polarization from three quark
flavors: the $s$ quark and t... | hep-lat |
Compact Gauge Fields on Causal Dynamical Triangulations: a 2D case study: We discuss the discretization of Yang-Mills theories on Dynamical
Triangulations in the compact formulation, with gauge fields living on the
links of the dual graph associated with the triangulation, and the numerical
investigation of the minimal... | hep-lat |
Approximate forms of the density of states: We compare MC calculations of the density of states in SU(2) pure gauge
theory with the weak and strong coupling expansions. Surprisingly, the range of
validity of the two approximations overlap significantly, however the large
order behavior of both expansions appear to be s... | hep-lat |
$χ_{\textrm{top}}(T \gg T_{\textrm{c}})$ in pure-glue QCD through
reweighting: We calculate the topological susceptibility at 2.5 Tc and 4.1 Tc in SU(3)
pure Yang-Mills theory. We define topology with the help of gradient flow and
we largely overcome the problem of poor statistics at high temperatures by
applying a r... | hep-lat |
Deconfinement transition and dimensional cross-over in the 3D gauge
Ising model: We present a high precision Monte Carlo study of the finite temperature $Z_2$
gauge theory in 2+1 dimensions. The duality with the 3D Ising spin model allows
us to use powerful cluster algorithms for the simulations. For temporal
extensi... | hep-lat |
Dirac-mode analysis for quark number density and its application for
deconfinement transition: The quark number density at finite imaginary chemical potential is
investigated in the lattice QCD using the Dirac-mode expansion. We find the
analytical formula of the quark number density in terms of the Polyakov loop in
... | hep-lat |
Recent Developments of Muon g-2 from Lattice QCD: One of the most promising quantities for the search of signatures of physics
beyond the Standard Model is the anomalous magnetic moment $g-2$ of the muon,
where a comparison of the experimental result with the Standard Model estimate
yields a deviation of about $3.5~\si... | hep-lat |
Towards corrections to the strong coupling limit of staggered lattice
QCD: We report on the first steps of an ongoing project to add gauge observables
and gauge corrections to the well-studied strong coupling limit of staggered
lattice QCD, which has been shown earlier to be amenable to numerical
simulations by the w... | hep-lat |
Impact of Dynamical Fermions on the Centre Vortex Gluon Propagator: The impact of $SU(3)$ centre vortices on the Landau-gauge gluon propagator is
calculated in the presence of dynamical fermions and compared to the pure
Yang-Mills case. The presence of dynamical fermions is found to alter the
behaviour of the centre vo... | hep-lat |
Enumerating Copies in the First Gribov Region on the Lattice in up to
four Dimensions: The covariant gauges are known to suffer from the Gribov problem: even after
fixing a gauge non-perturbatively, there may still exist residual copies which
are physically equivalent to each other, called Gribov copies. While the
in... | hep-lat |
Finite-volume effects in long-distance processes with massless leptonic
propagators: In Ref. [1], a method was proposed to calculate QED corrections to hadronic
self energies from lattice QCD without power-law finite-volume errors. In this
paper, we extend the method to processes which occur at second-order in the
we... | hep-lat |
Phase diagram of two-dimensional SU($N$) super-Yang--Mills theory with
four supercharges: We non-perturbatively study two-dimensional SU($N$) supersymmetric
Yang--Mills theory with four supercharges and large $12 \leq N \leq 20$.
Although this theory has no known holographic dual, we conduct numerical
investigations ... | hep-lat |
Lattice QCD Study of the Pentaquark Baryons: We study the spin $\frac12$ hadronic state in quenched lattice QCD to search
for a possible $S=+1$ pentaquark resonance. Simulations are carried out on
$8^3\times 24$, $10^3\times 24$, $12^3\times 24$ and $16^3\times 24$ lattices
at $\beta$=5.7 at the quenched level with the... | hep-lat |
Charmonium spectral functions from 2+1 flavour lattice QCD: Finite temperature charmonium spectral functions in the pseudoscalar and
vector channels are studied in lattice QCD with 2+1 flavours of dynamical
Wilson quarks, on fine isotropic lattices (with a lattice spacing of 0.057 fm),
with a non-physical pion mass of ... | hep-lat |
Lattice QCD results at finite T and μ: We propose a method to study lattice QCD at finite temperature (T) and
chemical potential (\mu). We test the method and compare it with the Glasgow
method using n_f=4 staggered QCD with imaginary \mu. The critical endpoint (E)
of QCD on the Re(\mu)-T plane is located. We use n_f=2... | hep-lat |
Complex spacing ratios of the non-Hermitian Dirac operator in
universality classes AI$^\dagger$ and AII$^\dagger$: We consider non-Hermitian Dirac operators in QCD-like theories coupled to a
chiral U(1) potential or an imaginary chiral chemical potential. We show that
in the continuum they fall into the recently disc... | hep-lat |
Light Hadron Masses from Lattice QCD: This article reviews lattice QCD results for the light hadron spectrum. We
give an overview of different formulations of lattice QCD, with discussions on
the fermion doubling problem and improvement programs. We summarize recent
developments in algorithms and analysis techniques, t... | hep-lat |
Hopping Parameter Analysis of Leptonic and Semi-Leptonic Heavy-Light
Decays: We study leptonic and semi-leptonic decays of D and B mesons. Use of the
Hopping Parameter Expansion (HPE) for two-point functions allows us
continuously to vary the pseudoscalar mass from below m_D up towards m_B. We
compute the pseudoscala... | hep-lat |
Hadron correlators with improved fermions: We investigate point-to-point correlation functions for various mesonic and
baryonic channels using the ${\cal O}(a)$-improved Wilson action due to
Sheikholeslami and Wohlert. We consider propagators to both time slices 0 and
1. We find that discretisation effects are more pro... | hep-lat |
Practical methods for a direct calculation of $ΔI=1/2$ $K$ to
$ππ$ Decay: A direct calculation of the complex $\Delta I=1/2$ kaon decay amplitude is
notoriously difficult because of the presence of disconnected graphs. Here we
describe and demonstrate two practical methods to defeat this problem: the
EigCG algorithm ... | hep-lat |
The Mellin moments $\langle x \rangle$ and $\langle x^2 \rangle$ for the
pion and kaon from lattice QCD: We present a calculation of the pion quark momentum fraction, $\langle x
\rangle$, and its third Mellin moment $\langle x^2 \rangle$. We also obtain
directly, for the first time, $\langle x \rangle$ and $\langle x... | hep-lat |
Chiral Limit of Staggered Fermions at Strong Couplings: A Loop
Representation: The partition function of two dimensional massless staggered fermions
interacting with U(N) gauge fields is rewritten in terms of loop variables in
the strong coupling limit. We use this representation of the theory to devise a
non-local M... | hep-lat |
Extending the eigCG algorithm to nonsymmetric Lanczos for linear systems
with multiple right-hand sides: The technique that was used to build the EigCG algorithm for sparse symmetric
linear systems is extended to the nonsymmetric case using the BiCG algorithm.
We show that, similarly to the symmetric case, we can bui... | hep-lat |
Status of Lattice QCD Determination of Nucleon Form Factors and their
Relevance for the Few-GeV Neutrino Program: Calculations of neutrino-nucleus cross sections begin with the
neutrino-nucleon interaction, making the latter critically important to
flagship neutrino oscillation experiments, despite limited measuremen... | hep-lat |
String breaking mechanisms induced by magnetic and electric condensates: The normal confining phase of gauge theories is characterised by the
condensation of magnetic monopoles and center vortices. Sometimes in coupled
gauge system one finds another phase with simultaneous condensation of electric
and magnetic charges.... | hep-lat |
Finite-size scaling for the left-current correlator with non-degenerate
quark masses: We study the volume dependence of the left-current correlator with
non-degenerate quark masses to next-to-leading order in the chiral expansion.
We consider three possible regimes: all quark masses are in the
$\epsilon$-regime, all ... | hep-lat |
Four-loop logarithms in 3d gauge + Higgs theory: We discuss the logarithmic contributions to the vacuum energy density of the
three-dimensional SU(3) + adjoint Higgs theory in its symmetric phase, and
relate them to numerical Monte Carlo simulations. We also comment on the
implications of these results for perturbative... | hep-lat |
Monopoles and hadron spectrum in quenched QCD: We report the preliminary results of the studies of hadron spectrum under the
background of abelian and monopole gauge fields in quenched Wilson SU(3) QCD.
Abelian gauge fields alone reproduce the same chiral limit as in the full case.
Critical hopping parameter $\kappa_c$... | hep-lat |
Nucleon to $Δ$ and $Δ$ form factors in Lattice QCD: We present recent lattice QCD results on the electroweak nucleon to $\Delta$
transition and $\Delta$ form factors using dynamical fermion gauge
configurations with a lowest pion mass of about 300 MeV, with special emphasis
in the determination of the sub-dominant quad... | hep-lat |
Hadron-Hadron Interactions from Imaginary-time Nambu-Bethe-Salpeter Wave
Function on the Lattice: Imaginary-time Nambu-Bethe-Salpeter (NBS) wave function is introduced to
extend our previous approach for hadron-hadron interactions on the lattice.
Scattering states of hadrons with different energies encoded in the NBS... | hep-lat |
Higgs and W boson spectrum from lattice simulations: The spectrum of energy levels is computed for all available angular momentum
and parity quantum numbers in the SU(2)-Higgs model, with parameters chosen to
match experimental data from the Higgs-W boson sector of the standard model.
Several multi-boson states are obs... | hep-lat |
Systematics of the HAL QCD Potential at Low Energies in Lattice QCD: The $\Xi\Xi$ interaction in the $^1$S$_0$ channel is studied to examine the
convergence of the derivative expansion of the non-local HAL QCD potential at
the next-to-next-to-leading order (N$^2$LO). We find that (i) the leading order
potential from th... | hep-lat |
Distributing the chiral and flavour components of Dirac-Kahler fermions
across multiple lattices: We use a specific implementation of discrete differential geometry to
describe Dirac-Kahler fermions in such a way that we can separate their chiral
and flavour components. The formulation introduces additional lattices ... | hep-lat |
Correlation functions in lattice formulations of quantum gravity: We compare different models of a quantum theory of four-dimensional lattice
gravity based on Regge's original proposal. From Monte Carlo simulations we
calculate two-point functions between geometrical quantities and estimate the
masses of the correspond... | hep-lat |
Lattice QCD study of baryon-baryon interactions in the (S,I)=(-2,0)
system using the coupled-channel formalism: We investigate baryon-baryon interactions with strangeness $S=-2$ and isospin
I=0 system from Lattice QCD. In order to solve this system, we prepare three
types of baryon-baryon operators ($\Lambda-\Lambda$... | hep-lat |
Chiral Phase Transition in Lattice QCD with Wilson Quarks: The nature of the chiral phase transition in lattice QCD is studied for the
cases of 2, 3 and 6 flavors with degenerate Wilson quarks, mainly on a lattice
with the temporal direction extension $N_t=4$. We find that the chiral phase
transition is continuous for ... | hep-lat |
New Algorithm of the Finite Lattice Method for the High-temperature
Expansion of the Ising Model in Three Dimensions: We propose a new algorithm of the finite lattice method to generate the
high-temperature series for the Ising model in three dimensions. It enables us
to extend the series for the free energy of the s... | hep-lat |
Chebyshev and Backus-Gilbert reconstruction for inclusive semileptonic
$B_{(s)}$-meson decays from Lattice QCD: We present a study on the nonperturbative calculation of observables for
inclusive semileptonic decays of $B_{(s)}$ mesons using lattice QCD. We focus
on the comparison of two different methods to analyse t... | 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 |
Systematics of the HAL QCD Potential at Low Energies in Lattice QCD: The $\Xi\Xi$ interaction in the $^1$S$_0$ channel is studied to examine the
convergence of the derivative expansion of the non-local HAL QCD potential at
the next-to-next-to-leading order (N$^2$LO). We find that (i) the leading order
potential from th... | hep-lat |
Absolute X-distribution and self-duality: Various models of QCD vacuum predict that it is dominated by excitations that
are predominantly self-dual or anti-self-dual. In this work we look at the
tendency for self-duality in the case of pure-glue SU(3) gauge theory using the
overlap-based definition of the field-strengt... | hep-lat |
Center Projection With and Without Gauge Fixing: We consider projections of SU(2) lattice link variables onto Z(2) center and
U(1) subgroups, with and without gauge-fixing. It is shown that in the absence
of gauge-fixing, and up to an additive constant, the static quark potential
extracted from projected variables agre... | hep-lat |
Lattice gauge-fixing for generic covariant gauges: We propose a method which allows the generalization of the Landau lattice
gauge-fixing procedure to generic covariant gauges. We report preliminary
numerical results showing how the procedure works for $SU(2)$ and $SU(3)$. We
also report numerical results showing that ... | hep-lat |
Twisted mass ensemble generation on GPU machines: We present how we ported the Hybrid Monte Carlo implementation in the tmLQCD
software suite to GPUs through offloading its most expensive parts to the QUDA
library. We discuss our motivations and some of the technical challenges that
we encountered as we added the requi... | hep-lat |
Evidence for fine tuning of fermionic modes in lattice gluodynamics: We consider properties of zero and near-zero fermionic modes in lattice
gluodynamics. The modes are known to be sensitive to the topology of the
underlying gluonic fields in the quantum vacuum state of the gluodynamics. We
find evidence that these mod... | hep-lat |
Towards the continuum limit of nucleon form factors at the physical
point using lattice QCD: We present results for the axial charge and root-mean-square (RMS) radii of
the nucleon obtained from 2+1 flavor lattice QCD at the physical point with a
large spatial extent of about 10 fm. Our calculations are performed wit... | hep-lat |
Non-perturbative renormalization of quark mass in Nf=2+1 QCD with the
Schroedinger functional scheme: We present an evaluation of the quark mass renormalization factor for Nf=2+1
QCD. The Schroedinger functional scheme is employed as the intermediate scheme
to carry out non-perturbative running from the low energy to... | hep-lat |
The Status of D-Theory: Field theories are usually quantized by performing a path integral over
configurations of classical fields. This is the case both in perturbation
theory and in Wilson's nonperturbative lattice field theory. D-theory is an
alternative nonperturbative formulation of field theory in which classical... | hep-lat |
On-shell representations of two-body transition amplitudes: single
external current: This work explores scattering amplitudes that couple two-particle systems via
a single external current insertion, $2+\mathcal{J}\to 2$. Such amplitudes can
provide structural information about the excited QCD spectrum. We derive an
... | 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 |
Lattice QCD Study for Confinement and Hadrons: Using SU(3) lattice QCD, we perform the detailed studies of the three-quark
and the multi-quark potentials. From the accurate calculation for more than 300
different patterns of 3Q systems, the static ground-state 3Q potential $V_{\rm
3Q}^{\rm g.s.}$ is found to be well de... | hep-lat |
Lattice QCD study of a five-quark hadronic molecule: We compute the ground-state energies of a heavy-light K-Lambda like system as
a function of the relative distance r of the hadrons. The heavy quarks, one in
each hadron, are treated as static. Then, the energies give rise to an
adiabatic potential Va(r) which we use ... | hep-lat |
Weak universality induced by $Q=\pm 2e$ charges at the deconfinement
transition of a (2+1)-d $U(1)$ lattice gauge theory: Matter-free lattice gauge theories (LGTs) provide an ideal setting to
understand confinement to deconfinement transitions at finite temperatures,
which is typically due to the spontaneous breakdow... | hep-lat |
A quark action for very coarse lattices: We investigate a tree-level O(a^3)-accurate action, D234c, on coarse
lattices. For the improvement terms we use tadpole-improved coefficients, with
the tadpole contribution measured by the mean link in Landau gauge.
We measure the hadron spectrum for quark masses near that of ... | hep-lat |
Controlling sign problems in spin models using tensor renormalization: We consider the sign problem for classical spin models at complex $\beta
=1/g_0^2$ on $L\times L$ lattices. We show that the tensor renormalization
group method allows reliable calculations for larger Im$\beta$ than the
reweighting Monte Carlo metho... | hep-lat |
Lee-Yang zeroes in the one flavour massive lattice Schwinger model: We study the partition function of the model formulated with Wilson fermions
with only one species, both analytically and numerically. At strong coupling we
construct the solution for lattice size up to $8\times 8$, a polynomial in the
hopping paramete... | hep-lat |
Order a improved renormalization constants: We present non-perturbative results for the constants needed for on-shell
$O(a)$ improvement of bilinear operators composed of Wilson fermions. We work
at $\beta=6.0$ and 6.2 in the quenched approximation. The calculation is done
by imposing axial and vector Ward identities o... | hep-lat |
B, Bs, K and pi weak matrix elements with physical light quarks: Calculations of pseudoscalar decay constants of B, Bs, K and pi mesons with
physical light quarks are presented. We use HISQ ensembles that include u,d,s
and c sea quarks at three lattice spacings. HISQ is used for the valence light
quarks and a radiative... | hep-lat |
Phase structure of two-color QCD at real and imaginary chemical
potentials; lattice simulations and model analyses: We investigate the phase structure of two-color QCD at both real and
imaginary chemical potentials mu, performing lattice simulations and analyzing
the data with the Polyakov-loop extended Nambu--Jona-L... | hep-lat |
Monopoles and Spatial String Tension in the High Temperature Phase of
SU(2) QCD: We studied a behavior of monopole currents in the high temperature
(deconfinement) phase of abelian projected finite temperature SU(2) QCD in
maximally abelian gauge. Wrapped monopole currents closed by periodic boundary
play an importan... | hep-lat |
The QCD equation of state in background magnetic fields: We determine the equation of state of 2+1-flavor QCD with physical quark
masses, in the presence of a constant (electro)magnetic background field on the
lattice. To determine the free energy at nonzero magnetic fields we develop a
new method, which is based on an... | 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 |
Fermionic observables in Numerical Stochastic Perturbation Theory: We present technical details of fermionic observables computations in NSPT.
In particular we discuss the construction of composite operators starting from
the inverse Dirac operator building block, the subtraction of UV divergences
and the treatment of ... | hep-lat |
Lattice calculation of SU(3) flavor breaking ratios in B - anti-B mixing: We present an unquenched lattice calculation for the SU(3) flavor breaking
ratios of the heavy-light decay constants and the $\Delta B = 2$ matrix
elements. The calculation was performed on $16^3 \times 32$ lattices with two
dynamical flavors of ... | hep-lat |
Duality and scaling in 3-dimensional scalar electrodynamics: Three-dimensional scalar electrodynamics, with a local U(1) gauge symmetry,
is believed to be dual to a scalar theory with a global U(1) symmetry, near the
phase transition point. The conjectured duality leads to definite predictions
for the scaling exponents... | hep-lat |
Correlation Functions of Hadron Currents in the QCD Vacuum Calculated in
Lattice QCD: Point-to-point vacuum correlation functions for spatially separated hadron
currents are calculated in quenched lattice QCD on a $16^3\times 24$ lattice
with $6/g^2=5.7$. The lattice data are analyzed in terms of dispersion
relations... | hep-lat |
Delta I = 3/2, K to Pi Pi Decays with a Nearly Physical Pion Mass: The Delta I = 3/2 K to Pi Pi decay amplitude is calculated on RBC/UKQCD 32^3
x 64, L_s=32 dynamical lattices with 2+1 flavors of domain wall fermions using
the DSDR and Iwasaki gauge action. The calculation is performed with a single
pion mass (m_pi=141... | hep-lat |
Simulating lattice QCD at finite temperature and zero quark mass: We simulate lattice QCD with an irrelevant chiral 4-fermion interaction which
allows us to simulate at zero quark mass. This enables us to study the
finite-temperature chiral-symmetry-restoring phase transition for 2 massless
quark flavours, which is bel... | hep-lat |
Spectroscopy in finite density lattice field theory: An exploratory
study in the relativistic Bose gas: We analyze 2-point functions in the relativistic Bose gas on the lattice,
i.e., a charged scalar phi-4 field with chemical potential mu. Using a
generalized worm algorithm we perform a Monte Carlo simulation in a d... | hep-lat |
A computational system for lattice QCD with overlap Dirac quarks: We outline the essential features of a Linux PC cluster which is now being
developed at National Taiwan University, and discuss how to optimize its
hardware and software for lattice QCD with overlap Dirac quarks. At present,
the cluster constitutes of 30... | hep-lat |
Infrared fixed point in SU(2) gauge theory with adjoint fermions: We apply Schrodinger-functional techniques to the SU(2) lattice gauge theory
with N_f=2 flavors of fermions in the adjoint representation. Our use of
hypercubic smearing enables us to work at stronger couplings than did previous
studies, before encounter... | hep-lat |
A new strategy for evaluating the LO HVP contribution to $(g-2)_μ$ on
the lattice: A highly physical model of the subtracted $I=1$ vector polarization, obtained
using a dispersive representation with precise hadronic $\tau$ decay data as
input, is used to investigate systematic issues in the lattice evaluation of
the... | hep-lat |
Atomic Bose Condensation and the Lattice: I show how interaction corrections to the Bose condensation temperature of an
atomic gas can be computed using a combination of perturbative effective field
theory and lattice techniques. | hep-lat |
The Landshoff-Nachtmann Pomeron on the Lattice: We investigate the Landshoff-Nachtmann two-gluon-exchange model of the
Pomeron using gluon propagators computed in the Landau gauge within quenched
lattice QCD calculations. We first determine an effective gluon-quark coupling
by constraining the Pomeron-quark coupling to... | hep-lat |
Display of probability densities for data from a continuous distribution: Based on cumulative distribution functions, Fourier series expansion and
Kolmogorov tests, we present a simple method to display probability densities
for data drawn from a continuous distribution. It is often more efficient than
using histograms... | hep-lat |
The vector and axial vector current in Wilson ChPT: We construct the vector and axial vector currents in Wilson Chiral
Perturbation Theory (WChPT), the low-energy effective theory for lattice QCD
with Wilson fermions.
Our construction is slightly different compared to ChPT in continuum QCD,
where the currents are ess... | hep-lat |
Glueball matrix elements: a lattice calculation and applications: We compute the matrix elements of the energy-momentum tensor between glueball
states and the vacuum in SU(3) lattice gauge theory and extrapolate them to the
continuum. These matrix elements may play an important phenomenological role in
identifying glue... | hep-lat |
Lattice Simulations using OpenACC compilers: OpenACC compilers allow one to use Graphics Processing Units without having
to write explicit CUDA codes. Programs can be modified incrementally using
OpenMP like directives which causes the compiler to generate CUDA kernels to be
run on the GPUs. In this article we look at ... | hep-lat |
Approaching the chiral point in two-flavour lattice simulations: We investigate the behaviour of the pion decay constant and the pion mass in
two-flavour lattice QCD, with the physical and chiral points as ultimate goal.
Measurements come from the ensembles generated by the CLS initiative using the
O(a)-improved Wilson... | hep-lat |
Critical exponents of a three dimensional O(4) spin model: By Monte Carlo simulation we study the critical exponents governing the
transition of the three-dimensional classical O(4) Heisenberg model, which is
considered to be in the same universality class as the finite-temperature QCD
with massless two flavors. We use... | hep-lat |
(1+1)-dimensional Baryons from the SU(N) Color-Flavor Transformation: The color-flavor transformation, an identity that connects two integrals,
each of which is over one of a dual pair of Lie groups acting in the fermionic
Fock space, is extended to the case of the special unitary group. Using this
extension, a toy mod... | hep-lat |
JLQCD IroIro++ lattice code on BG/Q: We describe our experience on the multipurpose C++ code IroIro++ designed for
JLQCD to run on the BG/Q installation at KEK. We discuss some details on the
performance improvements specific for the IBM Blue Gene Q. | hep-lat |
The spin content of the proton in quenched QCD: We present preliminary results on the proton spin structure function at zero
momentum, in the quenched approximation. Our calculation makes use of a
nonperturbative means of determining the multiplicative renormalization of the
topological charge density. | hep-lat |
Degeneracy of vector-channel spatial correlators in high temperature QCD: We study spatial isovector meson correlators in $N_f=2$ QCD with dynamical
domain-wall fermions on $32^3\times 8$ lattices at temperatures up to 380 MeV
with various quark masses. We measure the correlators of spin-one isovector
operators includi... | 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 |
A multigrid accelerated eigensolver for the Hermitian Wilson-Dirac
operator in lattice QCD: Eigenvalues of the Hermitian Wilson-Dirac operator are of special interest in
several lattice QCD simulations, e.g., for noise reduction when evaluating
all-to-all propagators. In this paper we present a Davidson-type eigensol... | hep-lat |
Investigating the critical properties of beyond-QCD theories using Monte
Carlo Renormalization Group matching: Monte Carlo Renormalization Group (MCRG) methods were designed to study the
non-perturbative phase structure and critical behavior of statistical systems
and quantum field theories. I adopt the 2-lattice mat... | hep-lat |
Progress on the QCD deconfinement critical point for $N_\text{f}=2$
staggered fermions: The global center symmetry of quenched QCD at zero baryonic chemical
potential is broken spontaneously at a critical temperature $T_c$ leading to a
first-order phase transition. Including heavy dynamical quarks breaks the
center s... | hep-lat |
QCD Thermodynamics: Recent results on QCD thermodynamics are presented. The nature of the T>0
transition is determined, which turns out to be an analytic cross-over. The
absolute scale for this transition is calculated. The temperature dependent
static potential is given. The results were obtained by using a Symanzik
i... | hep-lat |
A Wilson-Majorana Regularization for Lattice Chiral Gauge Theories: We discuss the regularization of chiral gauge theories on the lattice
introducing only physical degrees of freedom. This is obtained by writing the
Wilson term in a Majorana form, at the expense of the U(1) symmetry related to
fermion number conservati... | hep-lat |
Fighting topological freezing in the two-dimensional CP$^{N-1}$ model: We perform Monte Carlo simulations of the CP$^{N-1}$ model on the square
lattice for $N=10$, $21$, and $41$. Our focus is on the severe slowing down
related to instantons. To fight this problem we employ open boundary conditions
as proposed by L\"us... | hep-lat |
Numerical study of lattice index theorem usingimproved cooling and
overlap fermions: We investigate topological charge and the index theorem on finite lattices
numerically. Using mean field improved gauge field configurations we calculate
the topological charge Q using the gluon field definition with ${\cal
O}(a^4)$-... | hep-lat |
The pi-N Sigma term - an evaluation using staggered fermions: A lattice calculation of the pi-N sigma term is described using dynamical
staggered fermions. Preliminary results give a sea term comparable in magnitude
to the valence term. | hep-lat |
CP violation and Kaon weak matrix elements from Lattice QCD: In this short review, I present the recent lattice computations of kaon weak
matrix elements relevant to $K \to \pi\pi$ decays and neutral kaon mixing.
These matrix elements are key to the theoretical determination of the CP
violation parameters $\epsilon$ an... | hep-lat |
Anatomy of the sign-problem in heavy-dense QCD: QCD at finite densities of heavy quarks is investigated using the
density-of-states method. The phase factor expectation value of the quark
determinant is calculated to unprecedented precision as a function of the
chemical potential. Results are validated using those from... | hep-lat |
Finite-Size Scaling at Phase Coexistence: {}From a finite-size scaling (FSS) theory of cumulants of the order parameter
at phase coexistence points, we reconstruct the scaling of the moments.
Assuming that the cumulants allow a reconstruction of the free energy density
no better than as an asymptotic expansion, we find... | hep-lat |
Correlation Function in Ising Models: We simulated the fourier transform of the correlation function of the Ising
model in two and three dimensions using a single cluster algorithm with
improved estimators. The simulations are in agreement with series expansion and
the available exact results in $d=2$, which shows, tha... | hep-lat |
Quark orbital dynamics in the proton from Lattice QCD -- from Ji to
Jaffe-Manohar orbital angular momentum: Given a Wigner distribution simultaneously characterizing quark transverse
positions and momenta in a proton, one can directly evaluate their
cross-product, i.e., quark orbital angular momentum. The aforementio... | hep-lat |
The topological structures in strongly coupled QGP with chiral fermions
on the lattice: The nature of chiral phase transition for two flavor QCD is an interesting
but unresolved problem. One of the most intriguing issues is whether or not the
anomalous U(1) symmetry in the flavor sector is effectively restored along ... | hep-lat |
High performance Beowulf computer for lattice QCD: We describe the construction of a high performance parallel computer composed
of PC components, as well as the performance test in lattice QCD. | hep-lat |
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