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High Energy Physics - Lattice papers — page 186

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Reply to "Comment on `Relation between scattering amplitude and Bethe-Salpeter wave function in quantum field theory"'
We reemphasize the momentum dependence of the coefficients of the derivative expansion as already explained in our paper [1]. We also discuss how the momentum dependence plagues the time-dependent…
Takeshi Yamazaki, Yoshinobu KuramashiAug 20, 2018
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Three Dirac operators on two architectures with one piece of code and no hassle
A simple minded approach to implement three discretizations of the Dirac operator (staggered, Wilson, Brillouin) on two architectures (KNL and core i7) is presented. The idea is to use a high-level…
Stephan DurrAug 16, 2018
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Complex Langevin and boundary terms
As is well known the Complex Langevin (CL) method sometimes fails to converge or converges to the wrong limit. We identified one reason for this long ago: insufficient decay of the probability…
Manuel Scherzer, Erhard Seiler, Dénes Sexty et al.Aug 15, 2018
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The I=1 pion-pion scattering amplitude and timelike pion form factor from N f = 2+1 lattice QCD
The elastic I=1 p-wave ππ scattering amplitude is calculated together with the isovector timelike pion form factor using lattice QCD with N f=2+1 dynamical quark flavors. Wilson clover…
Christian Andersen, John Bulava, Ben Hörz et al.Aug 15, 2018
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On the removal of the trace mode in lattice N=4 super Yang-Mills theory
Twisted and orbifold formulations of lattice N=4 super Yang-Mills theory which possess an exact supersymmetry require a U(N)=SU(N) U(1) gauge group. In the naive continuum limit,…
Simon Catterall, Joel Giedt, Raghav G. JhaAug 14, 2018
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Dynamical stabilisation of complex Langevin simulations of QCD
The ability to describe strongly interacting matter at finite temperature and baryon density provides the means to determine, for instance, the equation of state of QCD at non-zero baryon chemical…
Felipe Attanasio, Benjamin JägerAug 13, 2018
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A calculation of the gauge anomaly with the chiral overlap operator
We investigate the property of the effective action with the chiral overlap operator, which was derived by Grabowska and Kaplan. They proposed a lattice formulation of four-dimensional chiral gauge…
Taichi AgoAug 8, 2018
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The Calculation of Force in Lattice Quantum Chromodynamics
The calculation of force is most difficult part in lattice Quantum Chromodynamics (QCD). This lecture gives the details of the force calculation in one-loop Symanzik improved action, Wilson fermion…
Daming LiAug 7, 2018
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Gluon Quasi-PDF From Lattice QCD
We present the first attempt to access the x-dependence of the gluon unpolarized parton distribution function (PDF), based on lattice simulations using the large-momentum effective theory (LaMET)…
Zhou-You Fan, Yi-Bo Yang, Adam Anthony et al.Aug 6, 2018
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RHMC with Block Solvers and Multiple Pseudofermions
The dominant cost of most lattice QCD simulations is the inversion of the Dirac operator required to calculate the force term in the RHMC update. One way to improve this situation is to use multiple…
Philippe de Forcrand, Liam KeeganAug 6, 2018
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The light-quark contribution to the leading HVP term of the muon g - 2 from twisted-mass fermions
We present a lattice calculation of the leading Hadronic Vacuum Polarization (HVP) contribution of the light u- and d-quarks to the anomalous magnetic moment of the muon, aμ HVP(ud),…
D. Giusti, F. Sanfilippo, S. SimulaAug 2, 2018
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Anatomy of a strong residual sign problem on the thimbles
Using a simple Gaussian-like Ansatz for the phase distribution of a theory with a complex action, we show how the thimble integration for the average phase factor can be plagued by a strong residual…
Jacques BlochAug 2, 2018
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QCD+QED lattice calculation of hadronic decay rates
Isospin is an almost exact symmetry of strong interactions and the corrections to the isosymmetric limit are, in general, at the percent level. For several hadronic quantities relevant for flavour…
D. GiustiJul 31, 2018
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NSPT estimate of the improvement coefficient cA to two loops
By using Numerical Stochastic Perturbation Theory (NSPT), we carry out a quenched two-loop computation of the improvement coefficient cA associated to the isovector axial current. Within the…
Christian TorreroJul 31, 2018
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Topological properties of CPN-1 models in the large-N limit
We investigate, by numerical simulations on a lattice, the θ-dependence of 2d CPN-1 models for a range of N going from 9 to 31, combining imaginary θ and simulated tempering techniques…
Claudio Bonanno, Claudio Bonati, Massimo D'EliaJul 30, 2018
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Nucleon spin structure from lattice QCD
In this lattice QCD study we evaluate the nucleon spin decomposition to quarks and gluons contributions. We employ one gauge ensemble of maximally twisted mass fermions with two degenerate light…
Constantia Alexandrou, Martha Constantinou, Kyriakos Hadjiyiannakou et al.Jul 30, 2018
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Connected and disconnected contributions to nucleon axial form factors using Nf=2 twisted mass fermions at the physical point
We present results on the isovector and isoscalar nucleon axial form factors including disconnected contributions,using an ensemble of Nf =2 twisted mass clover- improved Wilson fermions simulated…
Constantia Alexandrou, Martha Constantinou, Kyriakos Hadjiyiannakou et al.Jul 30, 2018
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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…
Joseph Karpie, Kostas Orginos, Savvas ZafeiropoulosJul 28, 2018
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Determining the Efficacy of Different Parameterizations of the z-expansion
We develop a methodology to test the accuracy of lattice extrapolations of the form factors in B decays only using experimental data. We test this methodology by comparing the BGL parameterization…
Erik Gustafson, Yannick MeuriceJul 26, 2018
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Examples of renormalization group transformations for image sets
Using the example of configurations generated with the worm algorithm for the two-dimensional Ising model, we propose renormalization group (RG) transformations, inspired by the tensor RG, that can…
Samuel Foreman, Joel Giedt, Yannick Meurice et al.Jul 26, 2018
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The curvature of the chiral pseudocritical line from LQCD: analytic continuation and Taylor expansion compared
We present a determination of the curvature κ of the chiral pseudocritical line from Nf=2+1 lattice QCD at the physical point obtained by adopting the Taylor expansion approach. Numerical…
Claudio Bonati, Massimo D'Elia, Francesco Negro et al.Jul 26, 2018
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Large-order NSPT for lattice gauge theories with fermions: the plaquette in massless QCD
Numerical Stochastic Perturbation Theory (NSPT) allows for perturbative computations in quantum field theory. We present an implementation of NSPT that yields results for high orders in the…
Luigi Del Debbio, Francesco Di Renzo, Gianluca FilaciJul 25, 2018
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Searching for a CEP signal with lattice QCD simulations
We discuss the reliability of available methods to constrain the location of the QCD critical endpoint with lattice simulations. In particular we calculate the baryon fluctuations up to χB8 using…
Zoltan Fodor, Matteo Giordano, Jana N. Guenther et al.Jul 25, 2018
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Accessing high-momentum nucleons with dilute stochastic sources
A novel stochastic technique combining a dilute source grid of Z3 noise with iterative momentum-smearing is used to study the proton correlation function at rest and in boosted frames on…
J. -J. Wu, W. Kamleh, D. ~B. Leinweber et al.Jul 25, 2018
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Lattice QCD and the anomalous magnetic moment of the muon
The anomalous magnetic moment of the muon, amu, has been measured with an overall precision of 540 ppb by the E821 experiment at BNL. Since the publication of this result in 2004 there has been a…
Harvey B. Meyer, Hartmut WittigJul 24, 2018
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