Accelerating lattice QCD simulations with 2 flavours of staggered fermions on multiple GPUs using OpenACC - a first attemptWe present the results of an effort to accelerate a Rational Hybrid Monte Carlo (RHMC) program for lattice quantum chromodynamics (QCD) simulation for 2 flavours of staggered fermions on multiple…Sourendu Gupta, Pushan Majumdar·Oct 25, 2017SaveLearn
BSM Kaon Mixing at the Physical PointWe present a progress update on the calculation of beyond the standard model (BSM) kaon mixing matrix elements at the physical point. Simulations are performed using 2+1 flavour domain wall lattice…Peter Boyle, Nicolas Garron, Julia Kettle et al.·Oct 25, 2017SaveLearn
Semileptonic B-meson decays to light pseudoscalar mesons on the HISQ ensemblesWe report the status of an ongoing lattice-QCD calculation of form factors for exclusive semileptonic decays of B mesons with both charged currents (Bπν, Bs Kν) and neutral…Zechariah Gelzer, C. Bernard, C. DeTar et al.·Oct 25, 2017SaveLearn
Performance Portability Strategies for Grid C++ Expression TemplatesOne of the key requirements for the Lattice QCD Application Development as part of the US Exascale Computing Project is performance portability across multiple architectures. Using the Grid C++…Peter A. Boyle, M. A. Clark, Carleton DeTar et al.·Oct 25, 2017SaveLearn
Light-by-light forward scattering amplitudes in Lattice QCDWe present our preliminary results on the calculation of hadronic light-by-light forward scattering amplitudes using vector four-point correlation functions computed on the lattice. Using a…Antoine Gerardin, Jeremy Green, Oleksii Gryniuk et al.·Oct 25, 2017SaveLearn
Updates on the Columbia plot and its extended/alternative versionsWe report on the status of ongoing investigations aiming at locating the deconfinement critical point with standard Wilson fermions and Nf=2 flavors towards the continuum limit (standard Columbia…Francesca Cuteri, Christopher Czaban, Owe Philipsen et al.·Oct 25, 2017SaveLearn
Extended investigation of the twelve-flavor β-functionWe report new results from high precision analysis of an important BSM gauge theory with twelve massless fermion flavors in the fundamental representation of the SU(3) color gauge group. The range of…Zoltan Fodor, Kieran Holland, Julius Kuti et al.·Oct 25, 2017SaveLearn
QCD in a moving frame: an exploratory studyThe framework of shifted boundary conditions has proven to be a very powerful tool for the non-perturbative investigation of thermal quantum field theories. For instance, it has been successfully…Mattia Dalla Brida, Leonardo Giusti, Michele Pepe·Oct 25, 2017SaveLearn
Flux tubes in Nf=2+1 QCD with external magnetic fieldsWe study the behavior of the confining flux tube in Nf=2+1 QCD at the physical point, discretized with the stout smearing improved staggered quark action and the tree level Symanzik gauge action.…Claudio Bonati, Salvatore Cali, Massimo D'Elia et al.·Oct 25, 2017SaveLearn
Continuum extrapolation of quarkonium correlators at non-zero temperatureIn the investigation of in-medium modifications of quarkonia and for determining heavy quark diffusion coefficients, correlation functions play a crucial role. For the first time we perform a…Heng-Tong Ding, Olaf Kaczmarek, Anna-Lena Kruse et al.·Oct 24, 2017SaveLearn
RI/MOM and RI/SMOM renormalization of overlap quark bilinears on domain wall fermion configurationsRenormalization constants (RCs) of overlap quark bilinear operators on 2+1-flavor domain wall fermion configurations are calculated by using the RI/MOM and RI/SMOM schemes. The scale independent RC…Yujiang Bi, Hao Cai, Ying Chen et al.·Oct 24, 2017SaveLearn
Preliminary QCD phase transition line for 695 MeV dynamical staggered fermions from effective Polyakov line actionsWe present a phase diagram for SU(3) lattice gauge theory with 695 MeV dynamical staggered fermions, in the plane of temperature and chemical potential, obtained from effective Polyakov line actions.…Roman Höllwieser, Jeff Greensite·Oct 24, 2017SaveLearn
Proton mass decompositionWe report the results on the proton mass decomposition and also on the related quark and glue momentum fractions. The results are based on overlap valence fermions on four ensembles of Nf = 2+1…Yi-Bo Yang, Ying Chen, Terrence Draper et al.·Oct 24, 2017SaveLearn
Investigating BSM Models with Large Scale SeparationMass-split systems based on a conformal infrared fixed point provide a low-energy effective description of beyond the standard model systems with large scale separation. We report results of…Anna Hasenfratz, Claudio Rebbi, Oliver Witzel·Oct 24, 2017SaveLearn
openQ*D simulation code for QCD+QEDThe openQ*D code for the simulation of QCD+QED with C boundary conditions is presented. This code is based on openQCD-1.6, from which it inherits the core features that ensure its efficiency:…Isabel Campos, Patrick Fritzsch, Martin Hansen et al.·Oct 24, 2017SaveLearn
Simulations of QCD and QED with C* boundary conditionsWe present exploratory results from dynamical simulations of QCD in isolation, as well as QCD coupled to QED, with C* boundary conditions. In finite volume, the use of C* boundary conditions allows…Martin Hansen, Biagio Lucini, Agostino Patella et al.·Oct 24, 2017SaveLearn
BaHaMAS: A Bash Handler to Monitor and Administrate SimulationsNumerical QCD is often extremely resource demanding and it is not rare to run hundreds of simulations at the same time. Each of these can last for days or even months and it typically requires a…Alessandro Sciarra·Oct 24, 2017SaveLearn
SU(3) sextet model with Wilson fermionsWe present our final results for the SU(3) sextet model with the non-improved Wilson fermion discretization. We find evidence for several phases of the lattice model, including a bulk phase with…Martin Hansen, Claudio Pica·Oct 24, 2017SaveLearn
Worldlines and worldsheets for non-abelian lattice field theories: Abelian color fluxes and Abelian color cyclesWe discuss recent developments for exact reformulations of lattice field theories in terms of worldlines and worldsheets. In particular we focus on a strategy which is applicable also to non-abelian…Christof Gattringer, Daniel Göschl, Carlotta Marchis·Oct 24, 2017SaveLearn
Thermal modifications of charmonia and bottomonia from spatial correlation functionsWe present our study on the thermal modifications of charmonia and bottomonia from spatial correlation functions at zero and nonzero momenta in quenched QCD. To accommodate the heavy quarks on the…Heng-Tong Ding, Olaf Kaczmarek, Anna-lena Kruse et al.·Oct 24, 2017SaveLearn
Comparison of different source calculations in two-nucleon channel at large quark massWe investigate a systematic error coming from higher excited state contributions in the energy shift of light nucleus in the two-nucleon channel by comparing two different source calculations with…Takeshi Yamazaki, Ken-ichi Ishikawa. Yoshinobu Kuramashi·Oct 23, 2017SaveLearn
Can a Linear Sigma Model Describe Walking Gauge Theories at Low Energies?In recent years, many investigations of confining Yang Mills gauge theories near the edge of the conformal window have been carried out using lattice techniques. These studies have revealed that the…Andrew Gasbarro·Oct 23, 2017SaveLearn
Performance of Complex Langevin Simulation in 0+1 dimensional massive Thirring model at finite densityStatistical sampling with the complex Langevin (CL) equation is applied to (0+1)-dimensional Thirring model, and its uniform-field variant, at finite fermion chemical potential μ. The CL simulation…Hirotsugu Fujii, Syo Kamata, Yoshio Kikukawa·Oct 23, 2017SaveLearn
Complex Langevin Simulations of QCD at Finite Density -- Progress ReportWe simulate lattice QCD at finite quark-number chemical potential to study nuclear matter, using the complex Langevin equation (CLE). The CLE is used because the fermion determinant is complex so…D. K. Sinclair, J. B. Kogut·Oct 23, 2017SaveLearn
Medium effects and parity doubling of hyperons across the deconfinement phase transitionWe analyse the behaviour of hyperons with strangeness S=-1,-2,-3 in the hadronic and quark gluon plasma phases, with particular interest in parity doubling and its emergence as the temperature…Gert Aarts, Chris Allton, Davide De Boni et al.·Oct 23, 2017SaveLearn