Origin of fermion masses without spontaneous symmetry breakingUsing a simple three dimensional lattice four-fermion model we argue that massless fermions can become massive due to interactions without the need for any spontaneous symmetry breaking. Using large…Venkitesh Ayyar, Shailesh Chandrasekharan·Nov 29, 2015SaveLearn
Recent progress on chiral symmetry breaking in QCDI review recent progress achieved on the lattice in the quantitative comprehension of chiral symmetry breaking in QCD. Emphasis is given to the recent precise computations of the spectral density of…Leonardo Giusti·Nov 27, 2015SaveLearn
Scale invariant behavior in a large N matrix modelEigenvalue distributions of properly regularized Wilson loop operators are used to study the transition from ultra-violet (UV) behavior to infra-red (IR) behavior in gauge theories coupled to matter…Rajamani Narayanan, Herbert Neuberger·Nov 27, 2015SaveLearn
Testing a generalized cooling procedure in the complex Langevin simulation of chiral Random Matrix TheoryThe complex Langevin method has been attracting much attention as a solution to the sign problem since the method was shown to work in finite density QCD in the deconfined phase by using the…Keitaro Nagata, Jun Nishimura, Shinji Shimasaki·Nov 27, 2015SaveLearn
Mass and Axial current renormalization in the Schrödinger functional scheme for the RG-improved gauge and the stout smeared O(a)-improved Wilson quark actionsWe present the quark mass and axial current renormalization factors for the RG-improved Iwasaki gauge action and three flavors of the stout smeared O(a)-improved Wilson quark action. We employ…K. -I. Ishikawa, N. Ishizuka, Y. Kuramashi et al.·Nov 27, 2015SaveLearn
Renormalizability of the Schrödinger FunctionalSymanzik showed that quantum field theory can be formulated on a space with boundaries by including suitable surface interactions in the action to implement boundary conditions. We show that to all…A. D. Kennedy, Stefan Sint·Nov 27, 2015SaveLearn
Dynamical Restoration of ZN Symmetry in SU(N)+Higgs TheoriesWe study the ZN symmetry in SU(N)+Higgs theories with the Higgs field in the fundamental representation. The distributions of the Polyakov loop show that the ZN symmetry is explicitly broken in the…Minati Biswal, Sanatan Digal, P. S. Saumia·Nov 26, 2015SaveLearn
Induced YM theory with auxiliary bosonsWe study pure SU(N) lattice gauge theory with a plaquette weight factor given by an inverse determinant which can be written as an integral over auxiliary bosonic fields (modifying a proposal of…Bastian B. Brandt, Robert Lohmayer, Tilo Wettig·Nov 26, 2015SaveLearn
Mass spectroscopy using Borici-Creutz fermion on 2D latticeMinimally doubled fermion proposed by Creutz and Borici is a promising chiral fermion formulation on lattice. In this work, we present excited state mass spectroscopy for the meson bound states in…J. Goswami, D. Chakrabarti, S. Basak·Nov 24, 2015SaveLearn
Nucleon electromagnetic form factors and axial charge from CLS Nf=2+1 ensemblesWe present preliminary results on the electromagnetic form factors and axial charge of the nucleon from ensembles generated by the CLS effort with Nf=2+1 flavours of non-perturbatively…Dalibor Djukanovic, Tim Harris, Georg von Hippel et al.·Nov 23, 2015SaveLearn
The size of the pion from full lattice QCD with physical u, d, s and c quarksWe present the first calculation of the electromagnetic form factor of the π meson at physical light quark masses. We use configurations generated by the MILC collaboration including the effect of…J. Koponen, F. Bursa, C. T. H. Davies et al.·Nov 23, 2015SaveLearn
Density of states techniques for lattice field theories using the functional fit approach (FFA)We discuss a variant of density of states (DoS) techniques for lattice field theories, the so-called "functional fit approach" (FFA). The DoS FFA is based on a density of states rho(x) which…Christof Gattringer, Mario Giuliani, Alexander Lehmann et al.·Nov 23, 2015SaveLearn
Applications of the Feynman-Hellmann theorem in hadron structureThe Feynman-Hellmann (FH) relation offers an alternative way of accessing hadronic matrix elements through artificial modifications to the QCD Lagrangian. In particular, a FH-motivated method…A. J. Chambers, R. Horsley, Y. Nakamura et al.·Nov 23, 2015SaveLearn
LQCD: Flavor Physics and SpectroscopyI review highlights of recent results in quark-flavor physics and heavy-quark spectroscopy from lattice QCD, with emphasis on B-meson decays and excited and exotic charmonium states.Carleton DeTar·Nov 21, 2015SaveLearn
Hadronic form factors for rare semileptonic B decaysWe discuss first results for the computation of short distance contributions to semileptonic form factors for the rare B decays B K* +- and Bs ϕ+ -. Our…Jonathan Flynn, Andreas Jüttner, Taichi Kawanai et al.·Nov 20, 2015SaveLearn
Generalized Gradient Flow Equation and Its ApplicationsWe propose a generalization of the gradient flow equation for quantum field theories with nonlinearly realized symmetry. Applying the equation to N=1 SU(N) super Yang-Mills theory in…Sinya Aoki, Kengo Kikuchi, Tetsuya Onogi·Nov 20, 2015SaveLearn
NPR determination of quark masses from the HISQ actionI report on a calculation of bilinear Z-factors needed for determining Zm using non-perturbative renormalization (NPR) on nf=2+1+1 HISQ ensembles. RI/MOM and RI/SMOM schemes are studied. These will…Andrew T. Lytle·Nov 20, 2015SaveLearn
Fluctuations at finite temperature and densityFluctuations of conserved charges in a grand canonical ensemble can be calculated as derivatives of the free energy with respect to the respective chemical potential. They are directly related to…Szabolcs Borsanyi·Nov 20, 2015SaveLearn
Study of the conformal region of the SU(3) gauge theory with domain-wall fermionsWe investigate the phase structure of the SU(3) gauge theory with Nf=8 by numerical simulations employing the massless Domain-Wall fermions.Our aim is to study directly the massless quark region,…J. Noaki, G. Cossu, K-I. Ishikawa et al.·Nov 20, 2015SaveLearn
Exploring the nature of chiral phase transition in two-flavor QCD using extra heavy quarksChiral phase transition of two flavor QCD at finite quark masses is known to be crossover except near the chiral limit, but it can turn to a first order transition when adding many extra flavors.…Shinji Ejiri, Ryo Iwami, Norikazu Yamada·Nov 19, 2015SaveLearn
Resonance Parameters for the rho-meson from Lattice QCDWe present a calculation of the phase-shift for π-π scattering in isospin-1, spin-1 channel in the elastic region. The mass and width of the rho resonance is extracted by fitting these…Dehua Guo, Andrei Alexandru·Nov 19, 2015SaveLearn
ChPT meets lattice: finite volume and partial quenching for masses, decay constants and VEVs at NNLOWe discuss finite volume effects and partial quenching for Chiral Perturbation Theory in the mesonic sector. The effects are computed in terms of analytical expressions for masses, decay constants…Thomas Rössler, Johan Bijnens·Nov 19, 2015SaveLearn
Lattice gradient flow with tree-level O(a4) improvement in pure Yang-Mills theoryFollowing a recent paper by Fodor et al. (arXiv:1406.0827), we reexamine several types of tree-level improvements on the flow action with various gauge actions in order to reduce the lattice…Norihiko Kamata, Shoichi Sasaki·Nov 19, 2015SaveLearn
What is QFT? Resurgent trans-series, Lefschetz thimbles, and new exact saddlesThis is an introductory level review of recent applications of resurgent trans-series and Picard-Lefschetz theory to quantum mechanics and quantum field theory. Resurgence connects local perturbative…Gerald V. Dunne, Mithat Unsal·Nov 18, 2015SaveLearn
Convergent Perturbation Theory for the lattice ϕ4-modelThe standard lattice perturbation theory leads to the asymptotic series because of the incorrect interchange of the summation and integration. However, changing the initial approximation of the…Vladimir V. Belokurov, Aleksandr S. Ivanov, Vasily K. Sazonov et al.·Nov 18, 2015SaveLearn