Moments of pion distribution amplitude using operator product expansion on the latticeWe report an exploratory study of the current-current matrix elements that are relevant to the extraction of moments of the pion light-cone distribution amplitude, employing the method of introducing…William Detmold, Issaku Kanamori, C. -J. David Lin et al.·Oct 29, 2018SaveLearn
Complex Langevin for Lattice QCDWe simulate lattice QCD at finite quark-number chemical potential, μ, using the complex-Langevin equation (CLE) with gauge-cooling and adaptive updating to prevent instabilities. The CLE is used…D. K. Sinclair, J. B. Kogut·Oct 28, 2018SaveLearn
On the definition of schemes for computing leading order isospin breaking correctionsWe discuss an alternate scheme, or a 'line of constant physics', which can be used when computing isospin breaking corrections to hadronic quantities. We show that within a certain class of…Andrea Bussone, Michele Della Morte, Tadeusz Janowski et al.·Oct 27, 2018SaveLearn
Kπ scattering and excited meson spectroscopy using the stochastic LapH methodElastic I=1/2, s- and p-wave Kπ scattering amplitudes are simultaneously calculated using a Lüscher style analysis on a single ensemble of dynamical Wilson-clover fermions at mπ 230…Ruairí Brett, John Bulava, Jacob Fallica et al.·Oct 26, 2018SaveLearn
Beyond Complex Langevin Equations: a Progress ReportAfter a short review of one of proposals to avoid complex stochastic processes in Complex Langevin studies, the recent progress in the former is reported. In particular, the new developments allow…Jacek Wosiek, Blazej Ruba·Oct 26, 2018SaveLearn
Scattering phase shift determinations from a two-scalar field theoryA field theory involving two interacting scalar fields, previously studied by Rummukainen and Gottlieb, is revisited. Our study is not restricted to the limit of large quartic couplings, and a…Daniel Darvish, Ruairí Brett, John Bulava et al.·Oct 26, 2018SaveLearn
Reliability of Taylor expansions in QCDWe investigate the reliability of the Taylor expansion method in QCD with isospin chemical potentials using lattice simulations. By comparing the expansion of the number density to direct results,…Bastian B. Brandt, Gergely Endrodi·Oct 25, 2018SaveLearn
Strange nucleon form factors with Nf = 2 + 1 O(a)-improved Wilson fermionsWe present preliminary results for strangeness form factors of the nucleon computed on the CLS ensembles with Nf=2+1 flavors of O(a)-improved Wilson fermions. Our calculations are performed at…Dalibor Djukanovic, Harvey Meyer, Konstantin Ottnad et al.·Oct 25, 2018SaveLearn
Linear confinement and stress-energy tensor around static quark and anti-quark pair -- Lattice simulation with Yang-Mills gradient flow --We study the spatial distribution of the stress tensor around static quark-anti-quark pair in SU(3) lattice gauge theory. In particular, we reveal the transverse structure of the stress tensor…Ryosuke Yanagihara, Takumi Iritani, Masakiyo Kitazawa et al.·Oct 24, 2018SaveLearn
Kähler-Dirac fermions on Euclidean dynamical triangulationsWe study Kähler-Dirac fermions on Euclidean dynamical triangulations. This fermion formulation furnishes a natural extension of staggered fermions to random geometries without requring vielbeins and…Simon Catterall, Jack Laiho, Judah Unmuth-Yockey·Oct 24, 2018SaveLearn
Evidence for charm-bottom tetraquarks and the mass dependence of heavy-light tetraquark states from lattice QCDWe continue our study of heavy-light four-quark states and find evidence from lattice QCD for the existence of a strong-interaction-stable I(JP)=0(1+) udcb tetraquark with mass in…Anthony Francis, Renwick J. Hudspith, Randy Lewis et al.·Oct 24, 2018SaveLearn
Towards a determination of the nucleon EDM from the quark chromo-EDM operator with the gradient flowIn this proceedings, we lay the foundation for computing the contribution of quark chromo-electric dipole moment (qCEDM) operator to the nucleon electric dipole moment. By applying the gradient flow…Jangho Kim, Jack Dragos, Andrea Shindler et al.·Oct 24, 2018SaveLearn
Lattice quantum gravity with scalar fieldsWe consider the four-dimensional Euclidean dynamical triangulations lattice model of quantum gravity based on triangulations of S4. We couple it minimally to a scalar field in the quenched…Raghav G. Jha, Jack Laiho, Judah Unmuth-Yockey·Oct 23, 2018SaveLearn
x and x2 of the pion PDF from Lattice QCD with Nf=2+1+1 dynamical quark flavoursUsing Nf=2+1+1 lattice QCD, we determine the fermionic connected contributions to the second and third moment of the pion PDF. Based on gauge configurations from the European Twisted Mass…M. Oehm, C. Alexandrou, M. Constantinou et al.·Oct 23, 2018SaveLearn
Complex Langevin: Boundary terms and application to QCDWe employ the Complex Langevin method for simulation of complex-valued actions. First, we show how to test for convergence of the method by explicitely computing boundary terms and demonstrate this…Manuel Scherzer, Erhard Seiler, Dénes Sexty et al.·Oct 23, 2018SaveLearn
Controlling Excited-State Contributions with Distillation in Lattice QCD Calculations of Nucleon Isovector Charges gSu-d, gAu-d, gTu-dWe investigate the application of the distillation smearing approach, and the use of the variational method with an extended basis of operators facilitated by this approach, on the calculation of the…Colin Egerer, David Richards, Frank Winter·Oct 23, 2018SaveLearn
Splittings of low-lying charmonium masses at the physical pointWe present high-precision results from lattice QCD for the mass splittings of the low-lying charmonium states. For the valence charm quark, the calculation uses Wilson-clover quarks in the Fermilab…Carleton DeTar, Andreas S. Kronfeld, Song-haeng Lee et al.·Oct 23, 2018SaveLearn
2018 Update on K with lattice QCD inputsWe present updated results for K determined directly from the standard model (SM) with lattice QCD inputs such as BK, |Vcb|, |Vus|, ξ0, ξ2, ξLD,…Jon A. Bailey, Sunkyu Lee, Weonjong Lee et al.·Oct 23, 2018SaveLearn
Nucleon axial charge in domain-wall QCD with physical massNucleon isovector vector, gV, and axialvector, gA, charges calculated on a 2+1-flavor dynamical domain-wall-fermions (DWF) ensemble at physical mass jointly generated by RIKEN-BNL-Columbia…Shigemi Ohta·Oct 23, 2018SaveLearn
The critical endpoint in the 2d U(1) gauge-Higgs model at topological angle θ=πWe study 2d U(1) gauge Higgs systems with a θ-term. For properly discretizing the topological charge as an integer we introduce a mixed group- and algebra-valued discretization (MGA scheme) for the…Daniel Göschl, Christof Gattringer, Tin Sulejmanpasic·Oct 23, 2018SaveLearn
Progress and prospects of lattice supersymmetrySupersymmetry plays prominent roles in the study of quantum field theory and in many proposals for potential new physics beyond the standard model, while lattice field theory provides a…David Schaich·Oct 22, 2018SaveLearn
Chiral transition via the Banks-Casher relationWe investigate the properties of the finite-temperature QCD transition towards the chiral limit using staggered quarks. Starting from the 2+1-flavor physical point, the limit of massless quarks is…Gergely Endrodi, Lukas Gonglach·Oct 22, 2018SaveLearn
Persistent homology analysis of deconfinement transition in effective Polyakov-line modelThe persistent homology analysis is applied to the effective Polyakov-line model on a rectangular lattice to investigate the confinement-deconfinement nature. The lattice data are mapped onto the…Takehiro Hirakida, Kouji Kashiwa, Junpei Sugano et al.·Oct 17, 2018SaveLearn
On pion and kaon decay constants and chiral SU(3) extrapolationsWe consider the dependence of the pion and kaon decay constants on the up, down and strange quark masses in QCD with strict isospin symmetry. The role of dynamical vector meson degrees of freedom is…Xiao-Yu Guo, Matthias F. M. Lutz·Oct 17, 2018SaveLearn
Isolating the confining color field in the SU(3) flux tubeUsing lattice Monte Carlo simulations of SU(3) pure gauge theory, we determine the spatial distribution of all components of the color fields created by a static quark and antiquark. We identify the…M. Baker, P. Cea, V. Chelnokov et al.·Oct 16, 2018SaveLearn