Renormalization of Supersymmetric QCD on the LatticeWe perform a pilot study of the perturbative renormalization of a Supersymmetric gauge theory with matter fields on the lattice. As a specific example, we consider Supersymmetric N=1 QCD…Marios Costa, Haralambos Panagopoulos·Oct 13, 2017SaveLearn
ChPT loops for the lattice: pion mass and decay constant, HVP at finite volume and n n-oscillationsI present higher loop order results for several calculations in Chiral perturbation Theory. 1) Two-loop results at finite volume for hadronic vacuum polarization. 2) A three-loop calculation of the…Johan Bijnens·Oct 13, 2017SaveLearn
Satisfying positivity requirement in the Beyond Complex Langevin approachThe problem of finding a positive distribution, which corresponds to a given complex density, is studied. By the requirement that the moments of the positive distribution and of the complex density…Adam Wyrzykowski, Błażej Ruba·Oct 13, 2017SaveLearn
Smeared quasidistributions in perturbation theoryQuasi and pseudo distributions provide a new approach to determining parton distribution functions (PDFs) from first principles' calculations of quantum chromodynamics (QCD). Here I calculate the…Christopher Monahan·Oct 12, 2017SaveLearn
Vector two-point functions in finite volume using partially quenched chiral perturbation theoryWe calculate vector-vector correlation functions at two loops using partially quenched chiral perturbation theory including finite volume effects and twisted boundary conditions. We present…Johan Bijnens, Johan Relefors·Oct 12, 2017SaveLearn
Multi-hadron spectroscopy in a large physical volumeWe demonstrate the efficacy of the stochastic LapH method to treat all-to-all quark propagation on a Nf = 2+1 CLS ensemble with large linear spatial extent L = 5.5 fm, allowing us to obtain the…John Bulava, Ben Hörz, Colin Morningstar·Oct 12, 2017SaveLearn
Vector-Vector Scattering on the LatticeIn this work we present an extension of the Lüscher formalism to include the interaction of particles with spin, focusing on the scattering of two vector particles. The derived formalism will be…Fernando Romero-López, Carsten Urbach, Akaki Rusetsky·Oct 12, 2017SaveLearn
The equation of state with non-equilibrium methodsJarzynski's equality provides an elegant and powerful tool to directly compute differences in free energy in Monte Carlo simulations and it can be readily extended to lattice gauge theories to…Alessandro Nada, Michele Caselle, Marco Panero·Oct 12, 2017SaveLearn
Transversal and longitudinal gluon spectral functions from twisted mass lattice QCD with Nf=2+1+1 flavorsI report on the first application of a novel, generalized Bayesian reconstruction (BR) method for spectral functions to the characterization of QCD constituents. These spectral functions find…E. -M. Ilgenfritz, J. M. Pawlowski, A. Rothkopf et al.·Oct 12, 2017SaveLearn
Explicit positive representation for weights on RdIt is an old idea to replace averages of observables with respect to a complex weight by expectation values with respect to a genuine probability measure on complexified space. This is precisely what…Błażej Ruba, Adam Wyrzykowski·Oct 11, 2017SaveLearn
Scattering from finite-volume energies including higher partial waves and multiple decay channelsA new implementation of estimating the two-to-two K-matrix from finite-volume energies based on the Luescher formalism is described. The method includes higher partial waves and multiple decay…Ruairí Brett, John Bulava, Jacob Fallica et al.·Oct 11, 2017SaveLearn
Plasmon mass scale and quantum fluctuations of classical fields on a real time latticeClassical real-time lattice simulations play an important role in understanding non-equilibrium phenomena in gauge theories and are used in particular to model the prethermal evolution of heavy-ion…Tuomas Lappi, Aleksi Kurkela, Jarkko Peuron·Oct 11, 2017SaveLearn
The η meson at the physical point with Nf=2 Wilson twisted mass fermionsWe present results for the eta prime meson and the topological susceptibility in two flavour lattice QCD. The results are obtained using Wilson twisted mass fermions at maximal twist with pion masses…Christopher Helmes, Bastian Knippschild, Bartosz Kostrzewa et al.·Oct 10, 2017SaveLearn
Beyond Complex Langevin Equations: positive representation of a class of complex measuresA positive representation for a set of complex densities is constructed. In particular, complex measures on a direct product of U(1) groups are studied. After identifying general conditions which…Erhard Seiler, Jacek Wosiek·Oct 10, 2017SaveLearn
Towards extracting the timelike pion form factor on CLS two-flavour ensemblesResults are presented from an ongoing study of the ρ resonance. The focus is on CLS 2-flavour ensembles generated using O(a) improved Wilson fermions with pion masses ranging from 265…Felix Erben, Jeremy Green, Daniel Mohler et al.·Oct 10, 2017SaveLearn
Coulomb Artifacts and Breakdown of Perturbative Matching in Lattice NRQCDBy studying an explicit analytical solution of the Coulomb problem on the lattice we demonstrate a breakdown of perturbative matching for the description of the Coulomb artifacts in lattice NRQCD,…A. A. Penin, A. Rayyan·Oct 9, 2017SaveLearn
The Search for Beauty-fully Bound Tetraquarks Using Lattice Non-Relativistic QCDMotivated by multiple phenomenological considerations, we perform the first search for the existence of a bbbb tetraquark bound state with a mass below the lowest non-interacting…Ciaran Hughes, Estia Eichten, Christine T. H. Davies·Oct 9, 2017SaveLearn
The Staggered Fermion for the Gross-Neveu Model at Non-zero Temperature and DensityThe 2+1d Gross-Neveu model with finite density and finite temperature are studied by the staggered fermion discretization. The kinetic part of this staggered fermion in momentum space is used to…Daming Li·Oct 9, 2017SaveLearn
Instanton-dyon ensembles reproduce deconfinement and chiral restoration phase transitionsParadigm shift in gauge topology at finite temperatures, from the instantons to their constituents -- instanton-dyons -- has recently lead to studies of their ensembles and very significant advances.…E. Shuryak·Oct 9, 2017SaveLearn
Confinement study of an SU(4) gauge theory with fermions in multiple representationsWe discuss the phase diagnostics used in our finite-temperature study of an SU(4) gauge theory with dynamical fermions in both the fundamental and two-index antisymmetric representations. Beyond the…Venkitesh Ayyar, Daniel Hackett, William Jay et al.·Oct 9, 2017SaveLearn
Particle Projection Using a Complex Langevin MethodUsing complex stochastic quantization, we implement a particle-number projection technique on the partition function of spin-1/2 fermions at finite temperature on the lattice. We discuss the method,…C. R. Shill, J. E. Drut·Oct 9, 2017SaveLearn
Representation of complex probabilities and complex Gibbs samplingComplex weights appear in Physics which are beyond a straightforward importance sampling treatment, as required in Monte Carlo calculations. This is the well-known sign problem. The complex Langevin…L. L. Salcedo·Oct 9, 2017SaveLearn
Berezinskii-Kosterlitz-Thouless phase transition from lattice sine-Gordon modelWe obtain nonperturbative results on the sine-Gordon model using the lattice field technique. In particular, we employ the Fourier accelerated hybrid Monte Carlo algorithm for our studies. We find…Joel Giedt, James Flamino·Oct 9, 2017SaveLearn
Global Symmetries of Naive and Staggered Fermions in Arbitrary DimensionsIt is well-known that staggered fermions do not necessarily satisfy the same global symmetries as the continuum theory. We analyze the mechanism behind this phenomenon for arbitrary dimension and…Mario Kieburg, Tim R. Würfel·Oct 9, 2017SaveLearn
Improved real-time dynamics from imaginary frequency lattice simulationsThe computation of real-time properties, such as transport coefficients or bound state spectra of strongly interacting quantum fields in thermal equilibrium is a pressing matter. Since the sign…Jan M. Pawlowski, Alexander Rothkopf·Oct 7, 2017SaveLearn