Step scaling in coordinate space: running of the quark massWe perform a benchmark study of the step scaling procedure for the ratios of renormalization constants extracted from position space correlation functions. We work in the quenched approximation and…Krzysztof Cichy, Karl Jansen, Piotr Korcyl·Oct 25, 2016SaveLearn
In-medium dispersion relations of charmonia studied by maximum entropy methodWe study in-medium spectral properties of charmonia in the vector and pseudoscalar channels at nonzero momenta on quenched lattices, especially focusing on their dispersion relation and weight of the…Atsuro Ikeda, Masayuki Asakawa, Masakiyo Kitazawa·Oct 25, 2016SaveLearn
Parity doubling of nucleons and Delta baryons across the deconfinement phase transitionAt zero temperature the negative-parity ground states of the nucleon and delta baryons are non-degenerate with the positive-parity partners due to spontaneous breaking of chiral symmetry. However,…Gert Aarts, Chris Allton, Davide De Boni et al.·Oct 24, 2016SaveLearn
Chiral transition, eigenmode localisation and Anderson-like modelsWe discuss chiral symmetry restoration and eigenmode localisation in finite-temperature QCD by looking at the lattice Dirac operator as a random Hamiltonian. We argue that the features of QCD…Matteo Giordano, Tamas G. Kovacs, Ferenc Pittler·Oct 24, 2016SaveLearn
Particle Mesh Ewald's Method and Non-Interacting Dyon GasWe study the free energy of a quark-antiquark pair near the deconfinement temperature by particle mesh Ewald's method for non-interacting dyon ensemble. We show that the free energy of the…Motahareh Kiamari, Sedigheh Deldar·Oct 23, 2016SaveLearn
Light flavor-singlet scalars and walking signals in Nf=8 QCD on the latticeBased on the highly improved staggered quark action, we perform lattice simulations of Nf=8 QCD and confirm our previous observation of a flavor-singlet scalar meson (denoted as σ) as light as…Yasumichi Aoki, Tatsumi Aoyama, Ed Bennett et al.·Oct 22, 2016SaveLearn
Beyond complex Langevin equationsA simple integral relation between a complex weight and the corresponding positive distribution is derived by introducing a second complex variable. Together with the positivity and normalizability…Jacek Wosiek·Oct 21, 2016SaveLearn
Singlet vs Nonsinglet Perturbative Renormalization of Fermion BilinearsIn this paper we present the perturbative evaluation of the difference between the renormalization functions of flavor singlet and nonsinglet bilinear quark operators on the lattice. The computation…M. Constantinou, M. Hadjiantonis, H. Panagopoulos et al.·Oct 21, 2016SaveLearn
First numerical experiences with overlap fermions based on the Brillouin kernelNumerical experiences are reported with overlap fermions which employ the Brillouin action as a kernel. After discussing the dispersion relations of both the kernel and the resulting chiral action,…Stephan Durr, Giannis Koutsou·Oct 21, 2016SaveLearn
Towards Partial Compositeness on the Lattice: Baryons with Fermions in Multiple RepresentationsWe describe our recent lattice study of SU(4) gauge theory with fermions in the fundamental and sextet representations. In this theory, a new type of baryon consists of quarks in both…Thomas A. DeGrand, Daniel Hackett, William I. Jay et al.·Oct 20, 2016SaveLearn
Relative weights approach to dynamical fermions at finite densitiesThe method of relative weights, coupled with mean field theory, is applied to the problem of simulating gauge theories with dynamical staggered fermions at finite densities. We present initial…Jeff Greensite, Roman Höllwieser·Oct 19, 2016SaveLearn
Confinement from Center Vortices: A review of old and new resultsI briefly review the numerical evidence, some old and some quite recent, in favor of the center vortex theory of confinement.Jeff Greensite·Oct 19, 2016SaveLearn
Radiative contribution to the effective potential in a composite Higgs modelThe SU(4) gauge theory with two flavors of Dirac fermions in the sextet representation shares features of a candidate for a composite Higgs model. The analogue of the Higgs multiplet of the Standard…T. A. DeGrand, M. Golterman, W. I. Jay et al.·Oct 19, 2016SaveLearn
Nucleon in a periodic magnetic fieldThe energy shift of a nucleon in a static periodic magnetic field is evaluated at second order in the external field strength in perturbation theory. It is shown that the measurement of this energy…Andria Agadjanov, Ulf-G. Meißner, Akaki Rusetsky·Oct 18, 2016SaveLearn
Gauge engineering and propagatorsBeyond perturbation theory gauge-fixing becomes more involved due to the Gribov-Singer ambiguity: The appearance of additional gauge copies requires to define a procedure how to handle them. For the…Axel Maas·Oct 18, 2016SaveLearn
Computing the static potential using non-string-like trial statesWe present a method for computing the static quark-antiquark potential, which is not based on Wilson loops, but where the trial states are formed by eigenvector components of the covariant lattice…Tobias Neitzel, Janik Kämper, Owe Philipsen et al.·Oct 17, 2016SaveLearn
Proton-proton fusion and tritium β-decay from lattice quantum chromodynamicsThe nuclear matrix element determining the pp d e+ ν fusion cross section and the Gamow-Teller matrix element contributing to tritium β-decay are calculated with lattice Quantum…Martin J. Savage, Phiala E. Shanahan, Brian C. Tiburzi et al.·Oct 14, 2016SaveLearn
Results on the heavy-dense QCD phase diagram using complex LangevinComplex Langevin simulations have been able to successfully reproduce results from Monte Carlo methods in the region where the sign problem is mild and make predictions when it is exponentially hard.…Gert Aarts, Felipe Attanasio, Benjamin Jäger et al.·Oct 14, 2016SaveLearn
Connected and leading disconnected hadronic light-by-light contribution to the muon anomalous magnetic moment with physical pion massWe report a lattice QCD calculation of the hadronic light-by-light contribution to the muon anomalous magnetic moment at physical pion mass. The calculation includes the connected diagrams and the…Thomas Blum, Norman Christ, Masashi Hayakawa et al.·Oct 14, 2016SaveLearn
Calculation of the Nucleon Axial Form Factor Using Staggered Lattice QCDThe nucleon axial form factor is a dominant contribution to errors in neutrino oscillation studies. Lattice QCD calculations can help control theory errors by providing first-principles information…Aaron S. Meyer, Richard J. Hill, Andreas S. Kronfeld et al.·Oct 14, 2016SaveLearn
Towards Critical Physics in 2+1d with U(2N)-Invariant FermionsInteracting theories of N relativistic fermion flavors in reducible spinor representations in 2+1 spacetime dimensions are formulated on a lattice using domain wall fermions (DWF), for which a U(2N)…Simon Hands·Oct 14, 2016SaveLearn
Testing gauge-invariant perturbation theoryGauge-invariant perturbation theory for theories with a Brout-Englert-Higgs effect, as developed by Fröhlich, Morchio and Strocchi, starts out from physical, exactly gauge-invariant quantities as…Pascal Törek, Axel Maas·Oct 13, 2016SaveLearn
On the effect of excited states in lattice calculations of the nucleon axial chargeExcited-state contamination is one of the dominant uncertainties in lattice calculations of the nucleon axial-charge, gA. Recently published results in leading-order chiral perturbation theory…Maxwell T. Hansen, Harvey B. Meyer·Oct 12, 2016SaveLearn
Updated Lattice Results for Parton DistributionsWe provide an analysis of the x-dependence of the bare unpolarized, helicity and transversity iso-vector parton distribution functions (PDFs) from lattice calculations employing (maximally) twisted…Constantia Alexandrou, Krzysztof Cichy, Martha Constantinou et al.·Oct 12, 2016SaveLearn
Across the deconfinementThe deconfinement transition at vanishing chemical potential can be reliably studied by lattice simulations and its general features are by now well known. On the contrary, what happens at finite…Claudio Bonati, Massimo D'Elia, Marco Mariti et al.·Oct 11, 2016SaveLearn