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Overlap Fermion in External Gravity: On a lattice, we construct an overlap Dirac operator which describes the
propagation of a Dirac fermion in external gravity. The local Lorentz symmetry
is manifestly realized as a lattice gauge symmetry, while the general
coordinate invariance is expected to be restored only in the ... | hep-lat |
Energies and radial distributions of B_s mesons - the effect of
hypercubic blocking: This is a follow-up to our earlier work for the energies and the charge
(vector) and matter (scalar) distributions for S-wave states in a heavy-light
meson, where the heavy quark is static and the light quark has a mass about
that of... | hep-lat |
Lattice gauge theory and gluon color-confinement in curved spacetime: The lattice gauge theory for curved spacetime is formulated. A discretized
action is derived for both gluon and quark fields which reduces to the
generally covariant form in the continuum limit. Using the Wilson action, it is
shown analytically that ... | hep-lat |
$ππ$ scattering in partially-quenched twisted-mass chiral
perturbation theory: We study pion-pion scattering in partially-quenched twisted-mass lattice QCD
using chiral perturbation theory. The specific partially-quenched setup
corresponds to that used in numerical lattice QCD calculations of the $I=0$
scattering len... | hep-lat |
Why the overlap formula does not lead to chiral fermions: We describe a conceptually simple, but important test for the overlap
approach to the construction of lattice chiral gauge theories. We explain the
equivalence of the overlap formula with a certain waveguide model for a simple
set of gauge configurations (the tr... | hep-lat |
Naive Lattice Fermion without Doublers: We discuss the naive lattice fermion without the issue of doublers. A local
lattice massless fermion action with chiral symmetry and hermiticity cannot
avoid the doubling problem from the Nielsen-Ninomiya theorem. Here we adopt the
forward finite-difference deforming the $\gamma_... | hep-lat |
Topological Susceptibility and Zero Mode Size in Lattice QCD: We use the overlap formalism to define a topological index on the lattice. We
study the spectral flow of the hermitian Wilson-Dirac operator and identify
zero crossings with topological objects. We determine the topological
susceptibility and zero mode size ... | hep-lat |
Universality and Scaling at the chiral transition in two-flavor QCD at
finite temperature: The order of the phase transition in finite-temperature QCD with two
degenerate light quarks is still an open problem and corresponds to the last
question mark in the zero-density phase diagram of QCD. We argue that
establishin... | hep-lat |
The strong-coupling limit of minimal lattice Landau gauge: We study the gluon and ghost propagators of lattice Landau gauge in the
strong coupling limit $\beta = 0$ in pure SU(2) lattice gauge theory to find
evidence of the conformal infrared behaviour of these propagators as predicted
by a variety of functional contin... | hep-lat |
Lattice investigation of the phase diagram of the 1+1 dimensional
Gross-Neveu model at finite number of fermion flavors: We explore the phase structure of the 1+1 dimensional Gross-Neveu model at
finite number of fermion flavors using lattice field theory. Besides a chirally
symmetric phase and a homogeneously broken... | hep-lat |
Dynamics of Phase Transitions: The 3D 3-state Potts model: In studies of the QCD deconfining phase transition or cross-over by means of
heavy ion experiments, one ought to be concerned about non-equilibrium effects
due to heating and cooling of the system. In this paper we extend our previous
study of Glauber dynamics ... | hep-lat |
A Study of Charmonium Systems across the Deconfinement Transition: We present results from lattice studies of charmonium systems near the
deconfinement transition temperature. On quenched isotropic lattices with
lattice spacings between 0.02 and 0.05 fm, bar{q} q systems with quark masses
close to the charm mass and wi... | hep-lat |
Two-Dimensional Dynamical Triangulation using the Grand-canonical
Ensemble: The string susceptibility exponents of dynamically triangulated two
dimensional surfaces with sphere and torus topology were calculated using the
grand-canonical Monte Carlo method. We also simulated the model coupled to
d-Ising spins (d=1,2,... | hep-lat |
Tests of the lattice index theorem: We investigate the lattice index theorem and the localization of the
zero-modes for thick classical center vortices. For non-orientable spherical
vortices, the index of the overlap Dirac operator differs from the topological
charge although the traces of the plaquettes deviate only b... | hep-lat |
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... | hep-lat |
The finite temperature QCD using 2+1 flavors of domain wall fermions at
N_t = 8: We study the region of the QCD phase transition using 2+1 flavors of domain
wall fermions (DWF) and a $16^3 \times 8$ lattice volume with a fifth dimension
of $L_s = 32$. The disconnected light quark chiral susceptibility, quark number
s... | hep-lat |
Light meson decay constants beyond the quenched approximation: We calculate the effects of including dynamical fermion loops in the lattice
QCD estimates of meson decay constants, by extrapolating the results from
negative flavour numbers after a suitable matching of the pion and rho mass.
For moderately light quarks, ... | hep-lat |
Properties of U(1) lattice gauge theory with monopole term: In 4D compact U(1) lattice gauge theory with a monopole term added to the
Wilson action we first reveal some properties of a third phase region at
negative $\beta$. Then at some larger values of the monopole coupling $\lambda$
by a finite-size analysis we find... | hep-lat |
Dirac Spectra of 2-dimensional QCD-like theories: We analyze Dirac spectra of two-dimensional QCD like theories both in the
continuum and on the lattice and classify them according to random matrix
theories sharing the same global symmetries. The classification is different
from QCD in four dimensions because the anti-... | hep-lat |
Propagators in lattice Coulomb gauge and confinement mechanisms: We discuss the gluon propagator in 3- and 4-dimensional Yang-Mills theories
in Coulomb gauge and compare it with the corresponding Landau gauge propagator,
showing that for both the relevant IR mass scale coincides. We also report
preliminary results on C... | hep-lat |
Simulations of Discrete Random Geometries: Simplicial Quantum Gravity
and Quantum String Theory: I investigate two discrete models of random geometries, namely simplicial
quantum gravity and quantum string theory. In four-dimensional simplicial
quantum gravity, I show that the addition of matter gauge fields to the m... | hep-lat |
Employing the perturbative definition of the Higgs mass in a
non-perturbative calculation: In perturbative calculations the masses of the Higgs, the Ws and the Z are
usually determined from the pole position of the corresponding gauge-dependent
propagators. In full non-perturbative lattice calculations it is much mor... | hep-lat |
Strange quark contribution to nucleon form factors: We discuss methods for the calculation of disconnected diagrams and their
application to various form factors of the nucleon. In particular, we present
preliminary results for the strange contribution to the scalar and axial form
factors, calculated with N_f=2 dynamic... | hep-lat |
Moving NRQCD for B Form Factors at High Recoil: We derive the continuum and lattice tree-level moving NRQCD (mNRQCD) through
order 1/m^2. mNRQCD is a generalization of NRQCD for dealing with hadrons with
nonzero velocity u_mu. The quark's total momentum is written as P^mu=Mu^mu+k^mu
where k^mu << Mu^mu is discretized a... | hep-lat |
Worm Algorithm for CP(N-1) Model: The CP(N-1) model in 2D is an interesting toy model for 4D QCD as it
possesses confinement, asymptotic freedom and a non-trivial vacuum structure.
Due to the lower dimensionality and the absence of fermions, the computational
cost for simulating 2D CP(N-1) on the lattice is much lower ... | hep-lat |
Non-renormalization theorem in a lattice supersymmetric theory and the
cyclic Leibniz rule: N=4 supersymmetric quantum mechanical model is formulated on the lattice. Two
supercharges, among four, are exactly conserved with the help of the cyclic
Leibniz rule without spoiling the locality. In use of the cohomological
... | hep-lat |
Symmetries of mesons after unbreaking of chiral symmetry and their
string interpretation: Using the chirally invariant overlap Dirac operator we remove its
lowest-lying quasizero modes from the valence quark propagators and study
evolution of isovector mesons with J=1. At the truncation level about 50 MeV
SU(2)_L \ti... | hep-lat |
Can lattice data for two heavy-light mesons be understood in terms of
simply two-quark potentials?: By comparing lattice data for the two heavy-light meson system (Q^2 qbar^2)
with a standard many-body approach employing only interquark potentials, it is
shown that the use of unmodified two-quark potentials leads to ... | hep-lat |
Genetic Algorithm for SU(2) Gauge Theory on a 2-dimensional Lattice: An algorithm is proposed for the simulation of pure SU(N) lattice gauge
theories based on Genetic Algorithms(GAs). We apply GAs to SU(2) pure gauge
theory on a 2 dimensional lattice and show the results, the action per
plaquette and Wilson loops, are ... | hep-lat |
QCD-like technicolor on the lattice: This talk gives an overview, aimed at non-experts, of the recent progress on
the studies of technicolor models on the lattice. Phenomenologically successful
technicolor models require walking coupling; thus, an emphasis is put on the
determination of the beta-function of various mod... | hep-lat |
Screening masses in quenched (2+1)d Yang-Mills theory: universality from
dynamics?: We compute the spectrum of gluonic screening-masses in the $0^{++}$ channel
of quenched 3d Yang-Mills theory near the phase-transition. Our
finite-temperature lattice simulations are performed at scaling region, using
state-of-art tec... | hep-lat |
The kaon B-parameter from unquenched mixed action lattice QCD: We present a preliminary calculation of B_K using domain-wall valence quarks
and 2+1 flavors of improved staggered sea quarks. Both the size of the residual
quark mass, which measures the amount of chiral symmetry breaking, and of the
mixed meson splitting ... | hep-lat |
Meson masses in electromagnetic fields with Wilson fermions: We determine the light meson spectrum in QCD in the presence of background
magnetic fields using quenched Wilson fermions. Our continuum extrapolated
results indicate a monotonous reduction of the connected neutral pion mass as
the magnetic field grows. The v... | hep-lat |
Continuum Limit of Scalar Masses and Mixing Energies: We evaluate the continuum limit of the valence approximation to the mass of
scalar quarkonium and to the scalar quarkonium-glueball mixing energy for a
range of different quark masses. Our results answer several questions raised by
the proposed identification of $f_... | hep-lat |
Deflated GMRES with Multigrid for Lattice QCD: Lattice QCD solvers encounter critical slowing down for fine lattice spacings
and small quark mass. Traditional matrix eigenvalue deflation is one approach
to mitigating this problem. However, to improve scaling we study the effects of
deflating on the coarse grid in a hie... | hep-lat |
Confinement in non-Abelian lattice gauge theory via persistent homology: We investigate the structure of confining and deconfining phases in SU(2)
lattice gauge theory via persistent homology, which gives us access to the
topology of a hierarchy of combinatorial objects constructed from given data.
Specifically, we use... | hep-lat |
Anisotropic Improved Gauge Actions; --Perturbative and Numerical Studies
--: The $\Lambda$ parameter on the anisotropic lattice, the spatial and
temperature coupling constant $g_{\sigma}$, $g_{\tau}$ and their derivative
with respaect to the the anisotropy parameter $\xi$ are studied perturbatively
for the class of i... | hep-lat |
Flavour blindness and patterns of flavour symmetry breaking in lattice
simulations of up, down and strange quarks: QCD lattice simulations with 2+1 flavours (when two quark flavours are mass
degenerate) typically start at rather large up-down and strange quark masses
and extrapolate first the strange quark mass and t... | hep-lat |
Two-Dimensional Compact N=(2,2) Lattice Super Yang-Mills Theory with
Exact Supersymmetry: We construct two-dimensional N=(2,2) lattice super Yang-Mills theory, where
the gauge and Higgs fields are all represented by U(N) compact variables, with
keeping one exact supercharge along the line of the papers [1,2,3].
Inter... | hep-lat |
Lattice calculations of the spectroscopy of baryons with broken flavor
SU(3) symmetry and 3, 5, or 7 colors: Lattice Monte Carlo calculations of baryon spectroscopy in gauge groups
SU(N), N=3, 5, 7, are presented. The quenched valence fermions come in three
flavors, two degenerate mass ones and a third heavier flavor... | hep-lat |
Lattice Results for Heavy Light Matrix Elements: Lattice results for heavy light matrix elements are reviewed and some of
their implications are very briefly discussed. Despite the fact that in most
cases the lattice results for weak matrix elements at the moment have only a
modest accuracy of about 20--30\% they alrea... | hep-lat |
Infrared Gluon and Ghost Propagators from Lattice QCD. Results from
large asymmetric lattices: We report on the infrared limit of the quenched lattice Landau gauge gluon
and ghost propagators as well as the strong coupling constant computed from
large asymmetric lattices. The infrared lattice propagators are compared... | hep-lat |
Two loop lattice expansion of the Schroedinger functional coupling in
improved QCD: The contributions of the improved fermion action of Sheikholeslami and
Wohlert to the two loop coefficient of the expansion of the Schroedinger
functional coupling in terms of the lattice coupling are calculated for the
gauge group SU... | hep-lat |
Meron-Cluster Simulation of a Chiral Phase Transition with Staggered
Fermions: We examine a (3+1)-dimensional model of staggered lattice fermions with a
four-fermion interaction and Z(2) chiral symmetry using the Hamiltonian
formulation. This model cannot be simulated with standard fermion algorithms
because those su... | hep-lat |
An Experimenter's View of Lattice QCD: Lattice QCD has the potential this decade to maximize the sensitivity of the
entire flavor physics program to new physics and pave the way for understanding
physics beyond the Standard Model at the LHC in the coming decade. However, the
challenge for the Lattice is to demonstrate ... | hep-lat |
Non-Perturbative Renormalization for Staggered Fermions (Self-energy
Analysis): We present preliminary results of data analysis for the non-perturbative
renormalization (NPR) on the self-energy of the quark propagators calculated
using HYP improved staggered fermions on the MILC asqtad lattices. We use the
momentum s... | hep-lat |
Screening at finite temperature and density: We present lattice QCD results on heavy quark free energies, extract from its
temperature dependence entropy and internal energy contributions, and discuss
the onset of medium effects that lead to screening of static quark-antiquark
sources in a thermal medium. Most results ... | hep-lat |
Polymer-Chain Adsorption Transition at a Cylindrical Boundary: In a recent letter, a simple method was proposed to generate solvable models
that predict the critical properties of statistical systems in hyperspherical
geometries. To that end, it was shown how to reduce a random walk in $D$
dimensions to an anisotropic ... | hep-lat |
Hunting the static energy renormalon: We employ Numerical Stochastic Perturbation Theory (NSPT) together with
twisted boundary conditions (TBC) to search for the leading renormalon in the
perturbative expansion of the static energy. This renormalon is expected to
emerge four times faster than the one for the gluon cond... | hep-lat |
Form factor ratios for $B_s \rightarrow K \, \ell \, ν$ and $B_s
\rightarrow D_s \, \ell \, ν$ semileptonic decays and $|V_{ub}/V_{cb}|$: We present a lattice quantum chromodynamics determination of the ratio of the
scalar and vector form factors for two semileptonic decays of the $B_s$ meson:
$B_s \rightarrow K \ell... | hep-lat |
Behavior near $θ=π$ of the mass gap in the 2D O(3) non-linear
sigma model: The validity of the Haldane's conjecture entails that the mass gap of the
2-dimensional O(3) non-linear sigma model with a $\theta$-term must tend to
zero as $\theta$ approaches the value $\pi$ by following a precise law. In the
present paper ... | hep-lat |
Lattice QCD Determination of $g_A$: The nucleon axial coupling, $g_A$, is a fundamental property of protons and
neutrons, dictating the strength with which the weak axial current of the
Standard Model couples to nucleons, and hence, the lifetime of a free neutron.
The prominence of $g_A$ in nuclear physics has made it ... | 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 $m_l = 0.05m_s... | hep-lat |
The scalar, vector and tensor form factors for the pion and kaon from
lattice QCD: We present a calculation of the scalar, vector, and tensor form factors for
the pion and kaon in lattice QCD. We use an ensemble of two degenerate light, a
strange and a charm quark ($N_f=2+1+1$) of maximally twisted mass fermions with... | hep-lat |
Signal/noise enhancement strategies for stochastically estimated
correlation functions: We develop strategies for enhancing the signal/noise ratio for stochastically
sampled correlation functions. The techniques are general and offer a wide
range of applicability. We demonstrate the potential of the approach with a
g... | hep-lat |
Infinite volume and continuum limits for gluon propagator in 3d SU(2)
lattice gauge theory: We study the Landau gauge gluon propagator D(p) in the 3d SU(2) lattice gauge
theory. We show that in the infinite-volume limit the expectation values over
the Gribov region \Omega, are different (in the infrared) from that ca... | hep-lat |
Measure dependence of 2D simplicial quantum gravity: We study pure 2D Euclidean quantum gravity with $R^2$ interaction on
spherical lattices, employing Regge's formulation. We attempt to measure the
string susceptibility exponent $\gamma_{\rm str}$ by using a finite-size
scaling Ansatz in the expectation value of $R^2$... | hep-lat |
Lattice Background Effective Action: a Proposal: We propose a method based on the Schr\"odinger functional for computing on
the lattice the gauge invariant effective action for external background
fields. We check this method by studying the U(1) lattice gauge theory in
presence of a constant magnetic background field. | hep-lat |
A precise determination of T_c in QCD from scaling: Existing lattice data on the QCD phase transition are analyzed in
renormalized perturbation theory. In quenched QCD it is found that T_c scales
for lattices with only 3 time slices, and that T_c/Lambda_msbar=1.15 \pm 0.05.
A preliminary estimate in QCD with two flavou... | hep-lat |
Strange quark momentum fraction from overlap fermion: We present a calculation of $< x >_s$ for the strange quark in the nucleon.
We also report the ratio of the strange $< x >$ to that of $u/d$ in the
disconnected insertion which will be useful in constraining the global fit of
parton distribution functions at small $... | hep-lat |
A lattice potential investigation of quark mass and volume dependence of
the $Υ$ spectrum: We investigate bottomonia splittings by solving a Schrodinger-Pauli-type
equation with parametrisations of QCD potentials around those that have been
determined previously in lattice simulations. This is done both, in the
conti... | hep-lat |
Confinement and Topological Charge in the Abelian Gauge of QCD: We study the relation between instantons and monopoles in the abelian gauge.
First, we investigate the monopole in the multi-instanton solution in the
continuum Yang-Mills theory using the Polyakov gauge. At a large instanton
density, the monopole trajecto... | hep-lat |
$1^{-+}$ Hybrid in $J/ψ$ Radiative Decays from Lattice QCD: We present the first theoretical prediction of the production rate of
$1^{-+}$ light hybrid meson $\eta_1$ in $J/\psi$ radiative decays. In the
$N_f=2$ lattice QCD formalism with the pion mass $m_\pi\approx 350$ MeV, the
related electromagnetic multipole form ... | hep-lat |
Improved Hamiltonians for Quantum Simulations: Quantum simulations of lattice gauge theories for the foreseeable future will
be hampered by limited resources. The historical success of improved lattice
actions in classical simulations strongly suggests that Hamiltonians with
improved discretization errors will reduce q... | hep-lat |
Moving from continuous to discrete symmetry in the 2D XY model: We study the effects of discretization on the U(1) symmetric XY model in two
dimensions using the Higher Order Tensor Renormalization Group (HOTRG)
approach. Regarding the $Z_N$ symmetric clock models as specific
discretizations of the XY model, we compare... | hep-lat |
The Quantized $O(1,2)/O(2)\times Z_2$ Sigma Model Has No Continuum Limit
in Four Dimensions. II. Lattice Simulation: A lattice formulation of the $O(1,2)/O(2)\times Z_2$ sigma model is
developed, based on the continuum theory presented in the preceding paper.
Special attention is given to choosing a lattice action (t... | hep-lat |
Curvature of the QCD critical line with 2+1 HISQ fermions: We present results on the curvature of the critical line of QCD with 2+1 HISQ
fermions at nonzero temperature and quark density obtained by analytic
continuation from imaginary chemical potentials. Monte Carlo simulations are
performed by means of the MILC code... | hep-lat |
A class of chiral fermion models: We study the relation between the Roma and Zaragoza proposals for chiral
fermions on the lattice. The fermion action in the Roma approach is shown to be
equivalent to one of the Zaragoza type. This result is used to perform a
mean-field study of the phase diagram for chiral Yukawa mode... | hep-lat |
Scaling in SU(3) Pure Gauge Theory with a Renormalization Group Improved
Action: We study the scaling properties of the static quark potential and the ratio
of the critical temperature $T_c$ to the square root of the string tension
$\sigma$ in the SU(3) pure gauge theory using a renormalization group improved
action.... | hep-lat |
Bound states for Overlap and Fixed Point Actions close to the chiral
limit: We study the overlap and the fixed point Dirac operators for massive fermions
in the two-flavor lattice Schwinger model. The masses of the triplet (pion) and
singlet (eta) bound states are determined down to small fermion masses and the
mass ... | hep-lat |
The spin structure of the Lambda hyperon in quenched lattice QCD: It has been suggested to use the production of Lambda hyperons for
investigating the nucleon spin structure. The viability of this idea depends
crucially on the spin structure of the Lambda. Using nonperturbatively O(a)
improved Wilson fermions in the qu... | hep-lat |
Polyakov loop in 2+1 flavor QCD: We study the temperature dependence of the renormalized Polyakov loop in 2+1
flavor QCD for temperatures T<210 MeV. We extend previous calculations by the
HotQCD collaboration using the highly improved staggered quark action and
perform a continuum extrapolation of the renormalized Poly... | hep-lat |
Implicit schemes for real-time lattice gauge theory: We develop new gauge-covariant implicit numerical schemes for classical
real-time lattice gauge theory. A new semi-implicit scheme is used to cure a
numerical instability encountered in three-dimensional classical Yang-Mills
simulations of heavy-ion collisions by all... | hep-lat |
How far can you go ? Surprises and pitfalls in three-flavour chiral
extrapolations: The presence of strange sea quark pairs may have a significant impact of the
pattern of chiral symmetry breaking : in particular large differences can occur
between the chiral limits of two and three massless flavours (i.e., whether
$... | hep-lat |
The derivative expansion of the renormalization group: By writing the flow equations for the continuum Legendre effective action
(a.k.a. Helmholtz free energy) with respect to a particular form of smooth
cutoff, and performing a derivative expansion up to some maximum order, a set
of differential equations are obtained... | hep-lat |
Electromagnetic Corrections in Staggered Chiral Perturbation Theory: To reduce errors in light-quark mass determinations, it is now necessary to
consider electromagnetic contributions to light-meson masses. Calculations
using staggered quarks and quenched photons are currently underway.
Suitably-extended chiral perturb... | hep-lat |
Towards continuum limit of screening lengths with chiral Fermions: We investigate mesonic screening correlators at T=2T_c using the overlap
Fermions in the quenched approximation, where T_c is the QCD phase transition
temperature. Using lattices with temporal extent up to 8, we found that both
pseudoscalar and vector c... | hep-lat |
The rate of photon production in the quark-gluon plasma from lattice QCD: We calculate the thermal rate of real-photon production in the quark-gluon
plasma at a temperature of $T=254$ MeV using lattice QCD. The calculation is
based on the difference between the spatially transverse and longitudinal parts
of the polariz... | hep-lat |
Localised Dirac eigenmodes and Goldstone's theorem at finite temperature: I show that a finite density of near-zero localised Dirac modes can lead to
the disappearance of the massless excitations predicted by the
finite-temperature version of Goldstone's theorem in the chirally broken phase
of a gauge theory. | hep-lat |
Vacuum energy of two-dimensional N=(2,2) super Yang-Mills theory: We measure the vacuum energy of two-dimensional N=(2,2) super Yang-Mills
theory using lattice simulation. The obtained vacuum energy density is
E_0=0.09(9)(+10-8) g^2, where the first error is the systematic and the second
is the statistical one, measure... | hep-lat |
Machine-learning physics from unphysics: Finding deconfinement
temperature in lattice Yang-Mills theories from outside the scaling window: We study the machine learning techniques applied to the lattice gauge
theory's critical behavior, particularly to the confinement/deconfinement phase
transition in the SU(2) and S... | hep-lat |
Energy--momentum tensor on the lattice: recent developments: It is conceivable that the construction of the energy--momentum tensor (EMT)
in lattice field theory enlarges our ability in lattice field theory and also
deepens our understanding on EMT at the non-pertubative level. In this talk, I
will review recent develo... | hep-lat |
A Critical Surface of Chiral-invariant System with Gauge Boson and
Fermions: In the chirally-invariant context of the $U_{em}(1)$ gauge interaction and
four-fermion interactions for ordinary and mirror fermions, the Schwinger-Dyson
equation for the fermion self-energy function is studied on a lattice. We find
that a ... | hep-lat |
End-to-end distribution function for dilute polymers: We study the end-to-end distribution function for dilute polymers. We present
a computation to order $O(\epsilon^2)$, $\epsilon = 4 - d$, and discuss in
detail its asymptotic behaviour for small and large distances. The theoretical
predictions are compared with Mont... | hep-lat |
Imaginary chemical potential and finite fermion density on the lattice: Standard lattice fermion algorithms run into the well-known sign problem at
real chemical potential. In this paper we investigate the possibility of using
imaginary chemical potential, and argue that it has advantages over other
methods, particular... | hep-lat |
Calculation of Moments of Structure Functions: The progress on the lattice computation of low moments of both the
unpolarised and polarised nucleon structure functions is reviewed with
particular emphasis on continuum and chiral extrapolations and comparison
between quenched and unquenched fermions. | hep-lat |
Near-Physical Point Lattice Calculation of Isospin-Breaking Corrections
to $K_{\ell2}/π_{\ell2}$: In recent years, lattice determinations of non-perturbative quantities such
as $f_K$ and $f_\pi$, which are relevant for $V_{us}$ and $V_{ud}$, have
reached an impressive precision of $\mathcal{O}(1\%)$ or better. To mak... | hep-lat |
Kaon decays and other hadronic processes in lattice QCD: This thesis deals with the study of properties and interactions of light
mesons. Specifically, we focus on hadronic decay and scattering processes,
which are dominated by effects of the strong interaction in the low-energy
regime. A peculiarity of the strong inte... | hep-lat |
A non-perturbative mechanism for elementary particle mass generation: Taking inspiration from lattice QCD data, we argue that a finite
non-perturbative contribution to the quark mass is generated as a consequence
of the dynamical phenomenon of spontaneous chiral symmetry breaking, in turn
triggered by the explicitly br... | hep-lat |
Quark chiral condensate from the overlap quark propagator: From the overlap lattice quark propagator calculated in the Landau gauge, we
determine the quark chiral condensate by fitting operator product expansion
formulas to the lattice data. The quark propagators are computed on domain wall
fermion configurations gener... | hep-lat |
The QCD phase diagram for small chemical potentials: We compute derivatives of thermodynamic quantities with respect to $\mu$, at
$\mu=0$ for 2 and 3 flavors of degenerate quark masses. This allows us to
estimate the phase transition line in the $T,\mu$ plane and quantify the
influence of a non vanishing chemical poten... | hep-lat |
Lattice QCD with Classical and Quantum Electrodynamics: We are doubtlessly familiar with some edition of Jackson's tome on
electrodynamics, and Schwinger's calculation of the anomalous magnetic moment
of the electron in QED. From the perspective of strong interactions, however,
electromagnetic effects usually amount to... | hep-lat |
Hadron Spectrum from Dynamical Lattice QCD Simulations: Recent progress in unquenched lattice QCD simulations is reviewed with
emphasis on understanding of chiral behavior for light quark masses. | hep-lat |
Higher representations on the lattice: perturbative studies: We present analytical results to guide numerical simulations with Wilson
fermions in higher representations of the colour group. The ratio of $\Lambda$
parameters, the additive renormalization of the fermion mass, and the
renormalization of fermion bilinears ... | hep-lat |
A guide to light-cone PDFs from Lattice QCD: an overview of approaches,
techniques and results: Within the theory of Quantum Chromodynamics (QCD), the rich structure of
hadrons can be quantitatively characterized, among others, using a basis of
universal non-perturbative functions: parton distribution functions (PDFs... | hep-lat |
Localized eigenmodes of covariant Laplacians in the Yang-Mills vacuum: As a probe of the Yang-Mills vacuum, we study numerically the eigenmode
spectrum of the covariant lattice Laplacian operator. We find that the
eigenmodes at the low and high ends of the spectrum are localized in finite
regions whose volume is insens... | hep-lat |
Extraction of $|V_{cd}|$ and $|V_{cs}|$ from experimental decay rates
using lattice QCD $D \to π(K) \ell ν$ form factors: We present a determination of the Cabibbo-Kobayashi-Maskawa matrix elements
$|V_{cd}|$ and $|V_{cs}|$ obtained by combining the momentum dependence of the
semileptonic vector form factors $f_+^{D ... | hep-lat |
Memory efficient finite volume schemes with twisted boundary conditions: In this paper we explore a finite volume renormalization scheme that combines
three main ingredients: a coupling based on the gradient flow, the use of
twisted boundary conditions and a particular asymmetric geometry, that for
$SU(N)$ gauge theori... | hep-lat |
Quenched hadron spectroscopy with improved staggered quark action: We investigate light hadron spectroscopy with an improved quenched staggered
quark action. We compare the results obtained with an improved gauge plus an
improved quark action, an improved gauge plus standard quark action, and the
standard gauge plus st... | hep-lat |
Hadron Spectrum in QCD with Valence Wilson Fermions and Dynamical
Staggered Fermions at $6/g^2=5.6: We present an analysis of hadronic spectroscopy for Wilson valence quarks
with dynamical staggered fermions at lattice coupling $6/g^2 = \beta=5.6$ at
sea quark mass $am_q=0.01$ and 0.025, and of Wilson valence quarks ... | hep-lat |
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