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CP invariance of chiral gauge theories and Majorana-Yukawa couplings on
the lattice: The construction of CP-invariant lattice chiral gauge theories and the
construction of lattice Majorana fermions with chiral Yukawa couplings is
subject to topological obstructions. In the present work we suggest lattice
extensions o... | hep-lat |
Lattice Gauge Fixing, Gribov Copies and BRST Symmetry: We show that a modification of the BRST lattice quantization allows to
circumvent an old paradox, formulated by Neuberger, related to lattice Gribov
copies and non-perturbative BRST invariance. In the continuum limit the usual
BRST formulation is recovered. | hep-lat |
Lattice field theory results for hybrid static potentials at short
quark-antiquark separations and their parametrization: We present SU(3) lattice Yang-Mills data for hybrid static potentials from
five ensembles with different small lattice spacings and the corresponding
parametrizations for quark-antiquark separatio... | hep-lat |
Can axial U(1) anomaly disappear at high temperature?: In our recent study of two-flavor lattice QCD using chiral fermions, we find
strong suppression of axial U(1) anomaly above the critical temperature of
chiral phase transition. Our simulation data also indicate suppression of
topological susceptibility. In this tal... | hep-lat |
String tensions of SU(N) gauge theories in 2+1 dimensions: We calculate the energy spectrum of closed strings in SU(N) gauge theories
with N=2,3,4,6,8 in 2+1 dimensions to a high accuracy. We attempt to control
all systematic errors, and this allows us to perform a precise comparison with
different theoretical predicti... | hep-lat |
Level spacings for weakly asymmetric real random matrices and
application to two-color QCD with chemical potential: We consider antisymmetric perturbations of real symmetric matrices in the
context of random matrix theory and two-color quantum chromodynamics. We
investigate the level spacing distributions of eigenval... | hep-lat |
Thermodynamics of free Domain Wall fermions: Studying various thermodynamic quantities for the free domain wall fermions
for both finite and infinite fifth dimensional extent N_5, we find that the
lattice corrections are minimum for $N_T\geq10$ for both energy density and
susceptibility, for its irrelevant parameter M ... | hep-lat |
Matrix elements of (delta S=2) operators with Wilson fermions: We test the recent proposal of using the Ward identities to compute the
K0-K0bar mixing amplitude with Wilson fermions, without the problem of spurious
lattice subtractions. From our simulations, we observe no difference between
the results obtained with an... | hep-lat |
Searching for continuous phase transitions in 5D SU(2) lattice gauge
theory: We study the phase diagram of 5-dimensional $SU(2)$ Yang-Mills theory on the
lattice. We consider two extensions of the fundamental plaquette Wilson action
in the search for the continuous phase transition suggested by the $4+\epsilon$
expan... | hep-lat |
What the Gribov copy tells on the confinment and the theory of dynamical
chiral symmetry breaking: We performed lattice Landau gauge QCD simulation on \beta=6.0, 16^4, 24^4,
32^4 and \beta=6.4, 32^4, 48^4 and 56^4 by adopting the gauge fixing that
minimizes the norm of the gauge field, and measured the running coupli... | hep-lat |
Stout-smearing, gradient flow and $c_{\text{SW}}$ at one loop order: The one-loop determination of the coefficient $c_\text{SW}$ of the Wilson
quark action has been useful to push the leading cut-off effects for on-shell
quantities to $\mathcal{O}(\alpha^2 a)$ and, in conjunction with
non-perturbative determinations of... | hep-lat |
Gauge Invariance and Lattice Monopoles: The number and the location of monopoles in Lattice configurations depend on
the choice of the gauge, in contrast to the obvious requirement that monopoles,
as physical objects, have a gauge-invariant status.
It is proved, starting from non-abelian Bianchi identities, that mono... | hep-lat |
Lyapunov Spectra in SU(2) Lattice Gauge Theory: We develop a method for calculating the Lyapunov characteristic exponents of
lattice gauge theories. The complete Lyapunov spectrum of SU(2) gauge theory is
obtained and Kolmogorov-Sinai entropy is calculated. Rapid convergence with
lattice size is found. | hep-lat |
The pion_0 to gamma gamma decay and the chiral anomaly in the
quark-composites approach to QCD: We evaluate the pion_0 into two gammas decay amplitude by an effective action
derived from QCD in the quark composites approach, getting the standard value.
We also verify that our effective action correctly reproduces the... | hep-lat |
Gradient Flow Coupling in the SU(2) gauge theory with two adjoint
fermions: We study SU(2) gauge theory with two fermion flavors in the adjoint
representation. Using a clover improved HEX smeared action and the gradient
flow running coupling allows us to simulate with larger lattice size than
before. We find an infra... | hep-lat |
Physical observables from boundary artifacts: scalar glueball in
Yang-Mills theory: By relating the functional averages of a generic scalar operator in
simulations with Open (O) and Periodic (P) boundary conditions (BCs)
respectively for $SU(3)$ lattice gauge theory, we show that the scalar glueball
mass and the glue... | hep-lat |
Controlling Residual Chiral Symmetry Breaking in Domain Wall Fermion
Simulations: At stronger gauge-field couplings, the domain wall fermion (DWF) residual
mass, a measure of chiral symmetry breaking, grows rapidly. This measure is
largely due to near zero fermion eigenmodes of logarithm of the 4D transfer
matrix alo... | hep-lat |
Developing and testing the density of states FFA method in the SU(3)
spin model: The Density of States Functional Fit Approach (DoS FFA) is a recently
proposed modern density of states technique suitable for calculations in
lattice field theories with a complex action problem. In this article we
present an explorator... | hep-lat |
Non-perturbative improvement of nHYP smeared Wilson fermions: Using Schroedinger functional techniques, we determine the coefficient of the
clover term necessary for non-perturbative O(a) improvement of hypercubic
smeared Wilson fermions on a quenched plaquette action background. Unlike for
unsmeared Wilson fermions, t... | hep-lat |
Excited states of massive fermions in a chiral gauge theory: It is shown numerically, in a chiral U(1) gauge Higgs theory in which the
left and right-handed fermion components have opposite U(1) charges, that the
spectrum of gauge and Higgs fields surrounding a static fermion contains both a
ground state and at least o... | hep-lat |
Type of dual superconductivity for the $SU(2)$ Yang--Mills theory: We investigate the type of dual superconductivity responsible for quark
confinement. For this purpose, we solve the field equations of the $U(1)$
gauge-scalar model to obtain the static vortex solution in the whole range
without restricting to the long-... | hep-lat |
Critical Behavior of the Schwinger Model with Wilson Fermions: We present a detailed analysis, in the framework of the MFA approach, of the
critical behaviour of the lattice Schwinger model with Wilson fermions on
lattices up to $24^2$, through the study of the Lee-Yang zeros and the specific
heat. We find compelling e... | hep-lat |
Aharonov--Bohm Effect in 3D Abelian Higgs Theory: We study a field--theoretical analogue of the Aharonov--Bohm effect in the 3D
Abelian Higgs Model: the corresponding topological interaction is proportional
to the linking number of the vortex and the particle world trajectories. We
show that the Aharonov--Bohm effect g... | hep-lat |
Multicanonical simulation of 3D dynamical triangulation model and a new
phase structure: We apply the multicanonical technique to the three dimensional dynamical
triangulation model, which is known to exhibit a first order phase transition
with the Einstein-Hilbert action. We first clarify the first order nature of
t... | hep-lat |
Clock model interpolation and symmetry breaking in O(2) models: Motivated by recent attempts to quantum simulate lattice models with
continuous Abelian symmetries using discrete approximations, we define an
extended-O(2) model by adding a $\gamma \cos(q\varphi)$ term to the ordinary
O(2) model with angular values restr... | hep-lat |
Measurement of hadron masses in 2-color finite density QCD: We investigate hadron spectra in 2-color QCD using lattice simulation with
$N_{f}=2$ at low temperature and finite density in which there appears not only
the hadronic phase but also the superfluid phase. We first calculate the pion
and rho meson spectrum, whi... | hep-lat |
Lambda(1405) and Negative-Parity Baryons in Lattice QCD: We review briefly recent studies of the Lambda(1405) spectrum in Lattice QCD.
Ordinary three-quark pictures of the Lambda(1405) in quenched Lattice QCD fail
to reproduce the mass of the experimental value, which seems to support the
penta-quark picture for the La... | hep-lat |
A Noisy Monte Carlo Algorithm: We propose a Monte Carlo algorithm to promote Kennedy and Kuti's linear
accept/reject algorithm which accommodates unbiased stochastic estimates of the
probability to an exact one. This is achieved by adopting the Metropolis
accept/reject steps for both the dynamical and noise configurati... | hep-lat |
Non-perturbative results for the coefficients b_m and b_a-b_p in O(a)
improved lattice QCD: We determine the improvement coefficients b_m and b_a-bp in quenched lattice
QCD for a range of beta-values, which is relevant for current large scale
simulations. At fixed beta, the results are rather sensitive to the precise... | hep-lat |
Calculation of the pion charge radius from an improved model-independent
method: We propose a new improved model-independent method for calculating the pion
charge radius. In a recently-proposed model-independent method for the pion
charge radius, we find it difficult to compute the pion charge radius for small
pole ... | hep-lat |
Inclusion of isospin breaking effects in lattice simulations: Isospin symmetry is explicitly broken in the Standard Model by the mass and
electric charge of the up and down quarks. These effects represent a
perturbation of hadronic amplitudes at the percent level. Although these
contributions are small, they play a cru... | hep-lat |
2+1 flavour Domain Wall Fermion simulations by the RBC and UKQCD
collaborations: We review simulations of dynamical domain wall fermions at a fixed inverse
lattice spacing of 1.73GeV and with pion masses as light as 330MeV and spatial
dimensions as large as 2.7fm performed by the RBC and UKQCD collaborations.
These r... | hep-lat |
Upper Higgs boson mass bounds from a chirally invariant lattice
Higgs-Yukawa model: We establish the cutoff-dependent upper Higgs boson mass bound by means of
direct lattice computations in the framework of a chirally invariant lattice
Higgs-Yukawa model emulating the same chiral Yukawa coupling structure as in
the H... | hep-lat |
On the type of the temperature phase transition in phi-4 model: The temperature induced phase transition is investigated in the one-component
scalar field \phi^4 model on a lattice by using Monte Carlo simulations. Using
the GPGPU technology a huge amount of data is collected that gives a
possibility to determine the L... | hep-lat |
Chiral symmetry restoration in QCD with many flavours: We discuss the phases of QCD in the parameter space spanned by the number of
light flavours and the temperature with respect to the realisation of chiral
and conformal symmetries. The intriguing interplay of these symmetries is best
studied by means of lattice simu... | 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 |
Exotic phases of finite temperature SU(N) gauge theories with massive
fermions: F, Adj, A/S: The phase diagrams at high temperature of SU(N) gauge theories with massive
fermions are calculated by numerically minimizing the one-loop effective
potential. We consider fermions in the Fundamental (F), Adjoint (Adj),
Antis... | hep-lat |
From C to Parton Sea: Bjorken-x Dependence of the PDFs: Studying the structure of nucleons is not only important to understanding the
strong interactions of quarks and gluons, but also to improving the precision
of new-physics searches. Since a broad class of experiments, including the LHC
and dark-matter detection, re... | hep-lat |
Axial Nucleon form factors from lattice QCD: We present results on the nucleon axial form factors within lattice QCD using
two flavors of degenerate twisted mass fermions. Volume effects are examined
using simulations at two volumes of spatial length $L=2.1$ fm and $L=2.8$ fm.
Cut-off effects are investigated using thr... | hep-lat |
Lattice calculation of matrix elements relevant for Delta I=1/2 rule and
epsilon-prime: We have gained enough statistical precision to distinguish signal from noise
in matrix elements of all operators relevant for the Delta I=1/2 rule in kaon
decays and for the direct CP violation parameter epsilon-prime. We confirm
... | hep-lat |
Acceleration of the Arnoldi method and real eigenvalues of the
non-Hermitian Wilson-Dirac operator: In this paper, we present a method for the computation of the low-lying real
eigenvalues of the Wilson-Dirac operator based on the Arnoldi algorithm. These
eigenvalues contain information about several observables. We ... | hep-lat |
How the Quark Number fluctuates in QCD at small chemical potential: We discuss the distribution of the quark number over the gauge fields for QCD
at nonzero quark chemical potential. As the quark number operator is
non-hermitian, the distribution is over the complex plane. Moreover, because of
the fermion determinant, ... | hep-lat |
A calculation of the $B_{B}$ parameter in the static limit: We calculate the $B_{B}$ parameter, relevant for $\overline{B}^0$ -- $B^0$
mixing, from a lattice gauge theory simulation at $\beta = 6.0$. The bottom
quarks are simulated in the static theory, the light quarks with Wilson
fermions. Improved smearing functions... | hep-lat |
UV divergence of the quasi-PDF operator under the lattice regularization: Even since the "quasi" parton distribution function (PDF) was proposed under
the large-momentum effective theory (LaMET) framework, its renormalization
under the lattice regularization has been a central challenge to be solved due
to the linear d... | hep-lat |
Partially Quenched QCD with Non-Degenerate Dynamical Quarks: We discuss the importance of using partially quenched theories with three
degenerate quarks for extrapolating to QCD, and present some relevant results
from chiral perturbation theory. | hep-lat |
The Weak-Coupling Limit of Simplicial Quantum Gravity: In the weak-coupling limit, kappa_0 going to infinity, the partition function
of simplicial quantum gravity is dominated by an ensemble of triangulations
with the ratio N_0/N_D close to the upper kinematic limit. For a combinatorial
triangulation of the D--sphere t... | hep-lat |
Perturbative renormalization functions of local operators for staggered
fermions with stout improvement: In this paper we present the perturbative computation of the renormalization
functions for the quark field and for a complete set of ultra-local fermion
bilinears. The computation of the relevant Green's functions... | hep-lat |
Light-quark connected intermediate-window contributions to the muon
$g-2$ hadronic vacuum polarization from lattice QCD: We present a lattice-QCD calculation of the light-quark connected
contribution to window observables associated with the leading-order hadronic
vacuum polarization contribution to the anomalous mag... | hep-lat |
Study of the finite temperature transition in 3-flavor QCD using the R
and RHMC algorithms: We study the finite temperature transition in QCD with three flavors of equal
masses using the R and RHMC algorithm on lattices with temporal extent
N_{\tau}=4 and 6. For the transition temperature in the continuum limit we fi... | hep-lat |
Fast Partitioning of Pauli Strings into Commuting Families for
Expectation Value Measurements of Dense Operators: The cost of measuring quantum expectation values of an operator can be
reduced by grouping the Pauli string ($SU(2)$ tensor product) decomposition of
the operator into maximally commuting sets. We detail ... | hep-lat |
Domain-wall and overlap fermions at nonzero quark chemical potential: We have recently given a construction of the overlap Dirac operator at
nonzero quark chemical potential. Here, we introduce a quark chemical potential
in the domain-wall fermion formalism and show that our earlier result is
reproduced if the extent o... | hep-lat |
Vacuum structure of gauge theory on lattice with two parallel plaquette
action: We perform Monte Carlo simulations of a lattice gauge system with an action
which contains two parallel plaquettes. The action is defined as a product of
gauge group variables over two parallel plaquettes belonging to a given
three-dimens... | hep-lat |
$Λ(1405)$ from lattice QCD: Low-lying $\Lambda$ baryons with spin 1/2 are analyzed in two-flavor lattice
QCD. In order to extract two low-lying states for each parity, we construct $2
\times 2$ cross correlators from flavor SU(3) ``octet'' and ``singlet'' baryon
operators, and diagonalize them. Two-flavor CP-PACS gauge... | hep-lat |
Applying Integrability to Gauge Theories: Lattice Yang-Mills theories in any dimension may be regarded as coupled
1+1-dimensional integrable field theories. These integrable systems decouple at
large center-of-mass energies, where the action becomes effectively
anisotropic. This effective action is the high-energy cent... | hep-lat |
Flavor Twisted Boundary Conditions in the Breit Frame: We use a generalization of chiral perturbation theory to account for the
effects of flavor twisted boundary conditions in the Breit frame. The relevant
framework for two light flavors is an SU(6|4) partially quenched theory, where
the extra valence quarks differ on... | hep-lat |
Formal Developments for Lattice QCD with Applications to Hadronic
Systems: Lattice quantum chromodynamics (QCD) will soon become the primary theoretical
tool in rigorous studies of single- and multi-hadron sectors of QCD. It is
truly ab initio meaning that its only parameters are those of standard model.
The result o... | hep-lat |
A Study of PCAC for the Nonperturbative Improvement of the Wilson Action: We present an exploratory study for the nonperturbative determination of the
coefficient of the ${\cal O}(a)$ improvement term to the Wilson action,
$c_{SW}$. Following the work by L\"{u}scher et al., we impose the PCAC relation
as a nonperturbat... | hep-lat |
Spectrum of the Hermitian Wilson Dirac operator: Recent results on the spectral properties of the Hermitian Wilson-Dirac
operator are presented. | hep-lat |
QCD Thermodynamics with an almost realistic quark mass spectrum: We will report on the status of a new large scale calculation of
thermodynamic quantities in QCD with light up and down quarks corresponding to
an almost physical light quark mass value and a heavier strange quark mass.
These calculations are currently be... | hep-lat |
Moments of Ioffe time parton distribution functions from non-local
matrix elements: We examine the relation of moments of parton distribution functions to matrix
elements of non-local operators computed in lattice quantum chromodynamics. We
argue that after the continuum limit is taken, these non-local matrix element... | hep-lat |
B-Bbar Mixing and Matching with Fermilab Heavy Quarks: We discuss the matching procedure for heavy-light 4-quark operators using the
Fermilab method for heavy quarks and staggered fermions for light quarks. These
ingredients enable us to construct the continuum-limit operator needed to
determine the oscillation frequen... | hep-lat |
A Numerical Test of KPZ Scaling: Potts Models Coupled to Two-Dimensional
Quantum Gravity: We perform Monte Carlo simulations using the Wolff cluster algorithm of the
q=2 (Ising), 3, 4 and q=10 Potts models on dynamical phi-cubed graphs of
spherical topology with up to 5000 nodes. We find that the measured critical
ex... | hep-lat |
Relativistic Lattice Boltzmann Methods: Theory and Applications: We present a systematic account of recent developments of the relativistic
Lattice Boltzmann method (RLBM) for dissipative hydrodynamics. We describe in
full detail a unified, compact and dimension-independent procedure to design
relativistic LB schemes c... | hep-lat |
Improved thermodynamics of SU(2) gauge theory: In this work we present the results of our investigation about the
thermodynamics of SU(2) gauge theory. We employ a Symanzik improved action to
reduce strongly the discretisations effects, and we use the scaling relations
to take into account the finite volume effects clo... | hep-lat |
Three dimensional vacuum domains in four dimensional SU(2) gluodynamics: Performing lattice simulations of the four dimensional SU(2)gluodynamics we
find evidence for existence of three-dimensional domains whose total volume
scales in physical units. Technically, the domains are defined in terms of the
minimal density ... | hep-lat |
$|V_{cb}|$ using lattice QCD: Lattice QCD calculations of hadronic matrix elements allow one to draw
inferences about quark flavor interactions from measurements of hadron decays.
Within the context of the Standard Model, the magnitude of the charm-bottom
quark coupling $V_{cb}$ can be determined from semileptonic deca... | hep-lat |
A no-go theorem for the Majorana fermion on a lattice: A variant of the Nielsen--Ninomiya no-go theorem is formulated. This theorem
states that, under several assumptions, it is impossible to write down a
doubler-free Euclidean lattice action of a single Majorana fermion in $8k$ and
$8k+1$ dimensions. | hep-lat |
N=1 super Yang-Mills on the lattice: We present results from a numerical study of N=1 supersymmetric Yang-Mills
theory using domain wall fermions. A set of dynamical simulations were
performed for the gauge group SU(2) using the Wilson gauge action on 8^3x8 and
16^3x32 lattices. We considered a range of gluino masses (... | hep-lat |
Spectral Functions of Hadrons in Lattice QCD: Using the maximum entropy method, spectral functions of the pseudo-scalar and
vector mesons are extracted from lattice Monte Carlo data of the imaginary time
Green's functions. The resonance and continuum structures as well as the ground
state peaks are successfully obtaine... | hep-lat |
Determination of the renormalized heavy-quark mass in Lattice QCD: We study on the lattice the correlator of heavy-quark currents in the
vicinity of vanishing momentum. The renormalized charmed quark mass, the
renormalized strong coupling constant and gluon condensate can be defined in
terms of the derivatives of that ... | hep-lat |
Field Theory Simulations on a Fuzzy Sphere - an Alternative to the
Lattice: We explore a new way to simulate quantum field theory, without introducing a
spatial lattice. As a pilot study we apply this method to the 3d \lambda \phi^4
model. The regularisation consists of a fuzzy sphere with radius R for the two
spatia... | hep-lat |
Lattice QCD calculation of hadronic light-by-light scattering: We perform a lattice QCD calculation of the hadronic light-by-light
scattering amplitude in a broad kinematical range. At forward kinematics, the
results are compared to a phenomenological analysis based on dispersive sum
rules for light-by-light scattering... | hep-lat |
Multigrid for Chiral Lattice Fermions: Domain Wall: Critical slowing down for the Krylov Dirac solver presents a major obstacle
to further advances in lattice field theory as it approaches the continuum
solution. We propose a new multi-grid approach for chiral fermions, applicable
to both the 5-d domain wall or 4-d Ove... | hep-lat |
Effective Monopole Potential for SU(2) Lattice Gluodynamics in Spatial
Maximal Abelian Gauge: We investigate the dual superconductor hypothesis in finite-temperature SU(2)
lattice gluodynamics in the Spatial Maximal Abelian gauge. This gauge is more
physical than the ordinary Maximal Abelian gauge due to absence of
n... | 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 |
Dirac sheets and gauge fixing in $U(1)$ lattice gauge theory: Photon correlators in $~U(1)~$ pure gauge theory for different lattice
actions are considered under the Lorentz gauge condition. They are shown to
depend strongly on the gauge fixing ambiguity and on the corresponding
existence of Dirac sheets. For the Coulo... | hep-lat |
Non-Perturbative Gauge-Higgs Unification in Five Dimensions: We study the phase diagram and mass spectrum of an $SU(2)$ Gauge-Higgs
Unification scenario on a five-dimensional orbifold.We observe spontaneous
symmetry breaking within the Higgs phase of the theory and, in the vicinity of
a newly discovered phase, we find ... | hep-lat |
Models of Walking Technicolor on the Lattice: We study QCD with 2 colour-sextet quarks as a walking-Technicolor candidate.
As such it provides a description of the Higgs sector of the standard model, in
which the Higgs field is replaced by the Goldstone `pions' of this QCD-like
theory, and the Higgs itself is the $\sig... | hep-lat |
Lattice study of the simplified model of M-theory for larger gauge
groups: Lattice discretization of the supersymmetric Yang-Mills quantum mechanics is
dis cussed. First results of the quenched Monte Carlo simulations, for D=4 and
with higher g auge groups (3 <= N <= 8), are presented. We confirm an earlier
(N=2) evi... | hep-lat |
SU(3)-breaking ratios for $D_{(s)}$ and $B_{(s)}$ mesons: We present results for the $SU(3)$ breaking ratios of decay constants
$f_{D_s}/f_D$ and $f_{B_s}/f_B$ and - for the first time with physical pion
masses - the ratio of bag parameters $B_{B_s}/B_{B_d}$, as well as the ratio
$\xi$, forming the ratio of the nonpetu... | hep-lat |
Euclidean lattice simulation for the dynamical supersymmetry breaking: The global supersymmetry is spontaneously broken if and only if the
ground-state energy is strictly positive. We propose to use this fact to
observe the spontaneous supersymmetry breaking in euclidean lattice
simulations. For lattice formulations th... | hep-lat |
Staggered domain wall fermions: Staggered Domain Wall Fermions (SDWF) combine the attractive chiral
properties of staggered fermions with those of domain wall fermions. SDWF
describe four flavors with exact U(1)xU(1) flavor chiral symmetry. An extra
lattice dimension is introduced and the full SU(4)xSU(4) flavor chiral... | hep-lat |
I=2 $π$-$π$ scattering length with dynamical overlap fermion: We report on a lattice QCD calculation of the I=2 $\pi\pi$ scattering length
using the overlap fermion formulation for both sea and valence quarks. We
investigate the consistency of the lattice data with the prediction of the
next-to-next-to-leading order ch... | hep-lat |
Role of chiral symmetry in the nucleon excitation spectrum: The origin of the low-lying nature of the $N$*(1440), or Roper resonance, has
been the subject of significant interest for many years, including several
investigations using lattice QCD. The majority of lattice studies have not
observed a low-lying excited sta... | hep-lat |
Matching effective chiral Lagrangians with dimensional and lattice
regularization: We compute the free energy in the presence of a chemical potential coupled to
a conserved charge in effective O($n$) scalar field theory (without explicit
symmetry breaking terms) to NNL order for asymmetric volumes in general
$d$--dim... | hep-lat |
2+1 Flavor QCD simulated in the epsilon-regime in different topological
sectors: We generated configurations with the parametrized fixed-point Dirac operator
D_{FP} on a (1.6 fm)^4 box at a lattice spacing a=0.13 fm. We compare the
distributions of the three lowest k=1,2,3 eigenvalues in the nu= 0,1,2
topological sec... | 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 |
Non-perturbative renormalisation of left-left four-fermion operators
with Neuberger fermions: We outline a general strategy for the non-perturbative renormalisation of
composite operators in discretisations based on Neuberger fermions, via a
matching to results obtained with Wilson-type fermions. As an application, w... | hep-lat |
Transversity PDFs of the proton from lattice QCD with physical quark
masses: We present a lattice QCD calculation of the transversity isovector- and
isoscalar-quark parton distribution functions (PDFs) of the proton utilizing a
perturbative matching at next-to-leading-order (NLO) accuracy. Additionally, we
determine ... | hep-lat |
Influence of Fermions on Vortices in SU(2)-QCD: Gauge fields control the dynamics of fermions, also a back reaction of
fermions on the gauge field is expected. This back reaction is investigated
within the vortex picture of the QCD vacuum. We show that the center vortex
model reproduces the string tension of the full t... | hep-lat |
Provenance for Lattice QCD workflows: We present a provenance model for the generic workflow of numerical Lattice
Quantum Chromodynamics (QCD) calculations, which constitute an important
component of particle physics research. These calculations are carried out on
the largest supercomputers worldwide with data in the m... | hep-lat |
Complete Monopole Dominance of the Yang-Mills Confining Potential: We continue our investigation of quark confinement using a particular variant
of the Cho-Duan-Ge gauge independent Abelian decomposition. The decomposition
splits the gauge field into a restricted Abelian part and a coloured part in a
way that preserves... | hep-lat |
Quarkonium mass splittings in three-flavor lattice QCD: We report on calculations of the charmonium and bottomonium spectrum in
lattice QCD. We use ensembles of gauge fields with three flavors of sea quarks,
simulated with the asqtad improved action for staggered fermions. For the heavy
quarks we employ the Fermilab in... | hep-lat |
Linear Covariant Gauges on the Lattice: Linear covariant gauges, such as Feynman gauge, are very useful in
perturbative calculations. Their nonperturbative formulation is, however,
highly non-trivial. In particular, it is a challenge to define linear covariant
gauges on a lattice. We consider a class of gauges in latti... | hep-lat |
Hyperon sigma terms for 2+1 quark flavours: QCD lattice simulations determine hadron masses as functions of the quark
masses. From the gradients of these masses and using the Feynman-Hellmann
theorem the hadron sigma terms can then be determined. We use here a novel
approach of keeping the singlet quark mass constant i... | hep-lat |
Towards an algebraic approach to the discretisation of fermions: A discretisation scheme for differential geometry is applied to the problem
of constructing lattice actions, the naive and staggered action are thus
derived. It is found that after specifying an ansatz for the space of fields,
the corresponding lattice ac... | hep-lat |
Improved Perturbation Theory for Improved Lattice Actions: We study a systematic improvement of perturbation theory for gauge fields on
the lattice; the improvement entails resumming, to all orders in the coupling
constant, a dominant subclass of tadpole diagrams.
This method, originally proposed for the Wilson gluon... | hep-lat |
High-accuracy two-loop computation of the critical mass for Wilson
fermions: We test an algebraic algorithm based on the coordinate-space method,
evaluating with high accuracy the critical mass for Wilson fermions in lattice
QCD at two loops. We test the results by using different types of infrared
regularization. | 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 |
Neutron Electric Dipole Moment on the Lattice: a Theoretical Reappraisal: We present a strategy for a lattice evaluation of the neutron electric dipole
moment induced by the strong CP violating term of the QCD Lagrangian. Our
strategy is based on the standard definition of the electric dipole moment,
involving the char... | hep-lat |
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