Recent progress in hadron structure from Lattice QCDWe review recent progress in hadron structure using lattice QCD simulations, with main focus in the evaluation of nucleon quantities such as the axial and tensor charges, and the spin con- tent of…Martha Constantinou·Nov 1, 2015SaveLearn
Application of the Lefschetz thimble formulation to the (0+1) dim. Thirring model at finite densityBased on the Lefschetz thimble formulation of path-integration, we analyze the (0+1) dimensional Thirring model at finite chemical potentials and perform hybrid Monte Carlo (HMC) simulations. We…Hirotsugu Fujii, Syo Kamata, Yoshio Kikukawa·Oct 31, 2015SaveLearn
Performance of GTX Titan X GPUs and Code OptimizationRecently Nvidia has released a new GPU model: GTX Titan X (TX) in a linage of the Maxwell architecture. We use our conjugate gradient code and non-perturbative renormalization code to measure the…Hwancheol Jeong, Sangbaek Lee, Weonjong Lee et al.·Oct 31, 2015SaveLearn
Gibbs sampling of complex valued distributionsA new technique is explored for the Monte Carlo sampling of complex-valued distributions. The method is based on a heat bath approach where the conditional probability is replaced by a positive…L. L. Salcedo·Oct 30, 2015SaveLearn
Static quark-antiquark pair free energy and screening masses: continuum results at the QCD physical pointWe study the correlators of Polyakov loops, and the corresponding gauge invariant free energy of a static quark-antiquark pair in 2+1 flavor QCD at finite temperature. Our simulations were carried…Szabolcs Borsanyi, Zoltan Fodor, Sandor D. Katz et al.·Oct 30, 2015SaveLearn
The microscopic Twisted Mass Dirac spectrum and the spectral determination of the LECs of Wilson χ-PTWe present the comparison of the analytical microscopic spectral density for lattice QCD with N f=2 twisted mass fermions with the one obtained on the lattice utilizing configurations…Krzysztof Cichy, Elena Garcia-Ramos, K. Splittorff et al.·Oct 30, 2015SaveLearn
X(3872) and Y(4140) using diquark-antidiquark operators with lattice QCDWe discuss a recent lattice study of charmonium-like mesons with JPC=1++ and three quark contents cc du, cc( uu + dd) and cc ss, where the latter two can…M. Padmanath, C. B. Lang, S. Prelovsek·Oct 30, 2015SaveLearn
Nf=2+1+1 renormalisation of four-quark operatorsWhen several four-quark operators are allowed to mix through renormalisation, this can considerably amplify the problems coming from perturbative truncation and discretisation effects. In this work…Julien Frison, Peter Boyle, Nicolas Garron·Oct 30, 2015SaveLearn
Insights into the heavy dense QCD phase diagram using Complex Langevin simulationsComplex Langevin simulations provide an alternative to sample path integrals with complex weights and therefore are suited to determine the phase diagram of QCD from first principles. Adaptive…Gert Aarts, Felipe Attanasio, Benjamin Jäger et al.·Oct 30, 2015SaveLearn
Towards the heavy dense QCD phase diagram using Complex Langevin simulationsMonte Carlo methods cannot probe far into the QCD phase diagram with a real chemical potential, due to the famous sign problem. Complex Langevin simulations, using adaptive step-size scaling and…Gert Aarts, Felipe Attanasio, Benjamin Jäger et al.·Oct 30, 2015SaveLearn
Testing the SU(4) degeneracy after low-mode removal with J=2 mesonsRecent lattice results on Dirac low-mode removed J=1,2 mesons and J=12 baryons reveal the appearance of a new SU(4) symmetry of confinement. Here the degeneracy of all J=2 iso-vector…M. Denissenya, L. Glozman, M. Pak·Oct 30, 2015SaveLearn
Anatomy of SU(3) flux tubes at finite temperatureAn attempt to adapt the study of color flux tubes to the case of finite temperature has been made. The field is measured both through the correlator of two Polyakov loops, one of which connected to a…Paolo Cea, Leonardo Cosmai, Francesca Cuteri et al.·Oct 30, 2015SaveLearn
Summary of Super Doubler Approach on Exact Lattice SupersymmetryWe have proposed a lattice SUSY formulation which we may call super doubler approach, where chiral fermion species doublers and their bosonic counter parts are either identified as super partners or…Alessandro D'Adda, Noboru Kawamoto, Jun Saito·Oct 30, 2015SaveLearn
Background field method in the gradient flowThe Yang--Mills gradient flow and its extension to the fermion field provide a very general method to obtain renormalized observables in gauge theory. The method is applicable also with…Hiroshi Suzuki·Oct 29, 2015SaveLearn
Lattice study of the Higgs-Yukawa model in and beyond the Standard ModelWe derive finite-size scaling formulae for four-dimensional Higgs-Yukawa models near the Gaussian fixed point. These formulae will play an essential role in future, detailed investigation of such…David Y. -J. Chu, Karl Jansen, Bastian Knippschild et al.·Oct 29, 2015SaveLearn
Accelerating Twisted Mass LQCD with QPhiXWe present the implementation of twisted mass fermion operators for the QPhiX library. We analyze the performance on the Intel Xeon Phi (Knights Corner) coprocessor as well as on Intel Xeon Haswell…Mario Schröck, Silvano Simula, Alexei Strelchenko·Oct 29, 2015SaveLearn
Non-Gaussianity of the topological charge distribution in SU(3) Yang-Mills theoryIn Yang-Mills theory, the cumulants of the naïve lattice discretization of the topological charge evolved with the Yang-Mills gradient flow coincide, in the continuum limit, with those of the…Marco Cè·Oct 29, 2015SaveLearn
Combining ordinary and topological finite volume effects for fixed topology simulationsIn lattice quantum field theories with topological sectors, simulations at fine lattice spacings --- with typical algorithms --- tend to freeze topologically. In such cases, specific topological…Arthur Dromard, Wolfgang Bietenholz, Urs Gerber et al.·Oct 29, 2015SaveLearn
Supermultiplets of the N=1 supersymmetric Yang-Mills theory in the continuum limitThe spectrum of N=1 supersymmetric Yang-Mills theory, calculated on the lattice, is presented. The masses have been determined on three different lattice spacings and extrapolated towards vanishing…Georg Bergner, Pietro Giudice, Istvan Montvay et al.·Oct 29, 2015SaveLearn
(Dimensional) twisted reduction in large N gauge theoriesWe show that the spontaneous breaking of center symmetry can be avoided on a L2× 12 lattice with the appropriate choice of twisted boundary conditions. In order for this to work it is…Liam Keegan, Alberto Ramos·Oct 28, 2015SaveLearn
The Yang-Mills gradient flow and lattice effective actionRecently, the Yang-Mills gradient flow is found to be a useful concept not only in lattice simulations but also in continuous field theories. Since its smearing property is similar to the Wilsoninan…Ryo Yamamura·Oct 28, 2015SaveLearn
Proposal for the Quantum Simulation of the CP(2) Model on Optical LatticesThe 2d CP(N-1) models share a number of features with QCD, like asymptotic freedom, a dynamically generated mass gap and topological sectors. They have been formulated and analysed successfully in…Catherine Laflamme, Wynne Evans, Marcello Dalmonte et al.·Oct 28, 2015SaveLearn
More on the properties of the first Gribov region in Landau gaugeComplete gauge-fixing beyond perturbation theory in non-Abelian gauge theories is a non-trivial problem. This is particularly evident in covariant gauges, where the Gribov-Singer ambiguity gives an…Axel Maas·Oct 28, 2015SaveLearn
Direct calculation of hadronic light-by-light scatteringWe report calculations of hadronic light-by-light scattering amplitudes via lattice QCD evaluation of Euclidean four-point functions of vector currents. These initial results include only the fully…Jeremy Green, Nils Asmussen, Oleksii Gryniuk et al.·Oct 28, 2015SaveLearn
Lattice computation of the nucleon scalar quark contents at the physical pointWe present a QCD calculation of the u, d and s scalar quark contents of nucleons based on 47 lattice ensembles with Nf = 2+1 dynamical sea quarks, 5 lattice spacings down to…S. Durr, Z. Fodor, C. Hoelbling et al.·Oct 27, 2015SaveLearn