Diagrammatic representation of scalar QCD and sign problem at nonzero chemical potentialWe consider QCD at strong coupling with scalar quarks coupled to a chemical potential. Performing the link integrals we present a diagrammatic representation of the path integral weight. It is based…Falk Bruckmann, Jacob Wellnhofer·Oct 23, 2017SaveLearn
Accurate simulation of the finite density lattice Thirring modelWe present a study of the finite density lattice Thirring model in 1+1 dimensions using the world-line/fermion-bag algorithm. The model has features similar to QCD and provides a test case for…Jarno Rantaharju·Oct 23, 2017SaveLearn
Phases of a strongly coupled four-fermion theoryWe present ongoing investigations of a four-dimensional lattice field theory with four massless reduced staggered fermions coupled through an SU(4)-invariant four-fermion interaction. As in previous…David Schaich, Simon Catterall·Oct 23, 2017SaveLearn
Continuum extrapolation of critical point for finite temperature QCD with Nf=3We study the critical point for finite temperature Nf=3 QCD using several temporal lattice sizes up to 10. In the study, the Iwasaki gauge action and non-perturbatively O(a) improved Wilson fermions…Xiao-Yong Jin, Yoshinobu Kuramashi, Yoshifumi Nakamura et al.·Oct 23, 2017SaveLearn
Flavor-singlet meson decay constants from Nf=2+1+1 twisted mass lattice QCDWe present an improved analysis of our lattice data for the η--η' system, including a correction of the relevant correlation functions for residual topological finite size effects and…Konstantin Ottnad, Carsten Urbach·Oct 22, 2017SaveLearn
Comparative studies of the deformation techniques for the singular-drift problem in the complex Langevin methodIn application of the complex Langevin method to QCD at high density and low temperature, the singular-drift problem occurs due to the appearance of near-zero eigenvalues of the Dirac operator. In…Yuta Ito, Jun Nishimura·Oct 22, 2017SaveLearn
Nucleon average quark momentum fraction with Nf=2+1 Wilson fermionsWe report on an analysis of the average quark momentum fraction of the nucleon and related quantities using Nf=2+1 Wilson fermions. Computations are performed on four CLS ensembles…Konstantin Ottnad, Tim Harris, Harvey Meyer et al.·Oct 21, 2017SaveLearn
Reversibility Violation in the Hybrid Monte Carlo AlgorithmWe investigate reversibility violations in the Hybrid Monte Carlo algorithm. Those violations are inevitable when computers with finite numerical precision are being used. In SU(2) gauge theory, we…Carsten Urbach·Oct 20, 2017SaveLearn
Parton distribution functions on the lattice and in the continuumIoffe-time distributions, which are functions of the Ioffe-time ν, are the Fourier transforms of parton distribution functions with respect to the momentum fraction variable x. These…Joseph Karpie, Kostas Orginos, Anatoly Radyushkin et al.·Oct 20, 2017SaveLearn
Degeneracy of vector-channel spatial correlators in high temperature QCDWe study spatial isovector meson correlators in Nf=2 QCD with dynamical domain-wall fermions on 323× 8 lattices at temperatures up to 380 MeV with various quark masses. We measure the…Christian Rohrhofer, Yasumichi Aoki, Guido Cossu et al.·Oct 20, 2017SaveLearn
Decoupling of charm beyond leading orderWe study the effective theory of decoupling of a charm quark at low energies. We do this by simulating a model, QCD with two mass-degenerate charm quarks. At leading order the effective theory is a…Francesco Knechtli, Tomasz Korzec, Björn Leder et al.·Oct 20, 2017SaveLearn
Dual Formulation and Phase Diagram of Lattice QCD in the Strong Coupling RegimeWe present the computation of invariants that arise in the strong coupling expansion of lattice QCD. These invariants are needed for Monte Carlo simulations of Lattice QCD with staggered fermions in…Giuseppe Gagliardi, Jangho Kim, Wolfgang Unger·Oct 20, 2017SaveLearn
Light meson form factors at high Q2 from lattice QCDMeasurements and theoretical calculations of meson form factors are essential for our understanding of internal hadron structure and QCD, the dynamics that bind the quarks in hadrons. The pion…Jonna Koponen, André Zimermmane-Santos, Christine Davies et al.·Oct 20, 2017SaveLearn
Pion electromagnetic form factor from full lattice QCDWe present the first calculation of the pion electromagnetic form factor at physical light quark masses. This form factor parameterises the deviations from the behaviour of a point-like particle when…Jonna Koponen, Francis Bursa, Christine T. H. Davies et al.·Oct 20, 2017SaveLearn
Supermultiplets in N=1 SUSY SU(2) Yang-Mills TheoryWe study N=1 supersymmetric Yang-Mills theory (SYM) on the lattice. The non-perturbative nature of supersymmetric field theories is still largely unknown. Similarly to QCD, SYM is…Sajid Ali, Georg Bergner, Henning Gerber et al.·Oct 20, 2017SaveLearn
Complex Langevin simulation of QCD at finite density and low temperature using the deformation techniqueWe study QCD at finite density and low temperature by using the complex Langevin method. We employ the gauge cooling to control the unitarity norm and introduce a deformation parameter in the Dirac…Keitro Nagata, Jun Nishimura, Shinji Shimasaki·Oct 20, 2017SaveLearn
Leading isospin-breaking effects on the latticeIsospin is an almost exact symmetry of strong interactions and the corrections to the isosymmetric limit are, in general, at the percent level. For several hadronic quantities, such as pseudoscalar…D. Giusti·Oct 19, 2017SaveLearn
D → Klν semileptonic decay using lattice QCD with HISQ at physical pion massesThe quark flavor sector of the Standard Model is a fertile ground to look for new physics effects through a unitarity test of the Cabbibo-Kobayashi-Maskawa (CKM) matrix. We present a lattice QCD…Bipasha Chakraborty, Christine Davies, Jonna Koponen et al.·Oct 19, 2017SaveLearn
Alternatives to the stochastic "noise vector" approachSeveral important observables, like the quark condensate and the Taylor coefficients of the expansion of the QCD pressure with respect to the chemical potential, are based on the trace of the inverse…Philippe de Forcrand, Benjamin Jaeger·Oct 19, 2017SaveLearn
Numerical experiments using deflation with the HISQ actionWe report on numerical experiments using deflation to compute quark propagators for the highly improved staggered quark (HISQ) action. The method is tested on HISQ gauge configurations, generated by…Christine Davies, Carleton DeTar, Craig McNeile et al.·Oct 19, 2017SaveLearn
Update on SU(2) gauge theory with NF = 2 fundamental flavoursWe present a non perturbative study of SU(2) gauge theory with two fundamental Dirac flavours. This theory provides a minimal template which is ideal for a wide class of Standard Model extensions…Vincent Drach, Tadeusz Janowski, Claudio Pica·Oct 19, 2017SaveLearn
Isospin Breaking Corrections to the HVP with Domain Wall FermionsWe present results for the QED and strong isospin breaking corrections to the hadronic vacuum polarization using Nf=2+1 Domain Wall fermions. QED is included in an electro-quenched setup using two…Peter Boyle, Vera Gülpers, James Harrison et al.·Oct 19, 2017SaveLearn
Dπ and D K semileptonic form factors with Nf=2+1+1 twisted mass fermionsWe present a lattice determination of the vector and scalar form factors of the Dπ(K)ν semileptonic decays, which are relevant for the extraction of the CKM matrix elements |Vcd| and…Vittorio Lubicz, Lorenzo Riggio, Giorgio Salerno et al.·Oct 19, 2017SaveLearn
Tensor form factor for the D π(K) transitions with Twisted Mass fermionsWe present a preliminary lattice calculation of the D π and D K tensor form factors fT(q2) as a function of the squared 4-momentum transfer q2. ETMC recently computed the vector…Vittorio Lubicz, Lorenzo Riggio, Giorgio Salerno et al.·Oct 19, 2017SaveLearn
Improved results for the mass spectrum of N=1 supersymmetric SU(3) Yang-Mills theoryThis talk summarizes the results of the DESY-Münster collaboration for N=1 supersymmetric Yang-Mills theory with the gauge group SU(3). It is an updated status report with respect to our…Sajid Ali, Georg Bergner, Henning Gerber et al.·Oct 19, 2017SaveLearn