Tensor representations of lattice vertices from hypercubic symmetryWe present a symmetry-based method for obtaining suitable tensor descriptions of lattice vertex functions without spinor components. The approach is based on finding the polynomial functions of…Milan Vujinovic·May 2, 2019SaveLearn
Absence of chiral symmetry breaking in Thirring models in 1+2 dimensionsThe Thirring model is an interacting fermion theory with current-current interaction. The model in 1+2 dimensions has applications in condensed-matter physics to describe the electronic excitations…Julian Lenz, Björn Wellegehausen, Andreas Wipf·Apr 30, 2019SaveLearn
Conformal perturbation theory confronts lattice results in the vicinity of a critical pointWe study the accuracy and predictive power of conformal perturbation theory by a comparison with lattice results in the neighborhood of the finite-temperature deconfinement transition of SU(2)…Michele Caselle, Nicodemo Magnoli, Alessandro Nada et al.·Apr 29, 2019SaveLearn
Pion generalized parton distribution from lattice QCDWe present the first lattice calculation of the valence-quark generalized parton distribution (GPD) of the pion using the large-momentum effective theory (LaMET) approach. We focus on the…Jiunn-Wei Chen, Huey-Wen Lin, Jian-Hui Zhang·Apr 28, 2019SaveLearn
Flow-based generative models for Markov chain Monte Carlo in lattice field theoryA Markov chain update scheme using a machine-learned flow-based generative model is proposed for Monte Carlo sampling in lattice field theories. The generative model may be optimized (trained) to…M. S. Albergo, G. Kanwar, P. E. Shanahan·Apr 26, 2019SaveLearn
Short Range Operator Contributions to 0νββ decay from LQCDThe search for neutrinoless double beta decay of nuclei is believed to be one of the most promising means to search for new physics. Observation of this very rare nuclear process, which violates…Henry Monge-Camacho, Evan Berkowitz, David Brantley et al.·Apr 26, 2019SaveLearn
Path optimization in 0+1 dimensional QCD at finite densityWe investigate the sign problem in 0+1 dimensional QCD at finite chemical potential by using the path optimization method. The SU(3) link variable is complexified to the SL(3,C) link…Yuto Mori, Kouji Kashiwa, Akira Ohnishi·Apr 25, 2019SaveLearn
Towards lattice-assisted hadron physics calculations based on QCD n-point functionsWe present preliminary lattice results for the nonperturbative tensor structure of the vector and axial-vector quark-antiquark vertices in QCD. Our lattice calculations are for Nf=2…André Sternbeck, Milena Leutnant, Gernot Eichmann·Apr 24, 2019SaveLearn
Magnetic catalysis and inverse catalysis for heavy pionsWe investigate the QCD phase diagram for nonzero background magnetic fields using first-principles lattice simulations. At the physical point (in terms of quark masses), the thermodynamics of this…Gergely Endrodi, Matteo Giordano, Sandor D. Katz et al.·Apr 23, 2019SaveLearn
Investigating volume effects for Nf=2 twisted clover fermions at the physical pointIn this work we present preliminary results on the nucleon axial and tensor charges, the quark momentum fraction and the first moment of the helicity distribution. The simulations have been performed…Constantia Alexandrou, Simone Bacchio, Martha Constantinou et al.·Apr 22, 2019SaveLearn
Finite-volume effects in (g-2)HVP,LOμAn analytic expression is derived for the leading finite-volume effects arising in lattice QCD calculations of the hadronic-vacuum-polarization contribution to the muon's magnetic moment,…Maxwell T. Hansen, Agostino Patella·Apr 22, 2019SaveLearn
Status and Future Perspectives for Lattice Gauge Theory Calculations to the Exascale and BeyondIn this and a set of companion whitepapers, the USQCD Collaboration lays out a program of science and computing for lattice gauge theory. These whitepapers describe how calculation using lattice QCD…Bálint Joó, Chulwoo Jung, Norman H. Christ et al.·Apr 22, 2019SaveLearn
Ensemble Quasi-Newton HMCWe present a modification of the Hybrid Monte Carlo algorithm for tackling the critical slowing down of generating Markov chains of lattice gauge configurations towards the continuum limit. We…Xiao-Yong Jin, James C. Osborn·Apr 22, 2019SaveLearn
Lattice Gauge Theory for Physics Beyond the Standard ModelThis document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for lattice field theory research to make an impact on models of new physics beyond the…Richard C. Brower, Anna Hasenfratz, Ethan T. Neil et al.·Apr 22, 2019SaveLearn
Hot-dense Lattice QCD: USQCD whitepaper 2018This document is one of a series of whitepapers from the USQCD collaboration. Here, we outline the opportunities for, prospects of and challenges to the lattice QCD calculations relevant for the…Alexei Bazavov, Frithjof Karsch, Swagato Mukherjee et al.·Apr 22, 2019SaveLearn
Lattice QCD and Neutrino-Nucleus ScatteringThis document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for lattice QCD in neutrino-oscillation physics, which inevitably entails nucleon and…Andreas S. Kronfeld, David G. Richards, William Detmold et al.·Apr 22, 2019SaveLearn
The Role of Lattice QCD in Searches for Violations of Fundamental Symmetries and Signals for New PhysicsThis document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for Lattice Quantum Chromodynamics (LQCD) in the research frontier in fundamental…Vincenzo Cirigliano, Zohreh Davoudi, Tanmoy Bhattacharya et al.·Apr 22, 2019SaveLearn
I=2 ππ potential in the HAL QCD method with all-to-all propagatorsIn this paper, we perform the first application of the hybrid method (exact low modes plus stochastically estimated high modes) for all-to-all propagators to the HAL QCD method. We calculate the HAL…Yutaro Akahoshi, Sinya Aoki, Tatsumi Aoyama et al.·Apr 21, 2019SaveLearn
Opportunities for lattice QCD in quark and lepton flavor physicsThis document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for lattice QCD in quark and lepton flavor physics. New data generated at Belle II, LHCb,…Christoph Lehner, Stefan Meinel, Tom Blum et al.·Apr 20, 2019SaveLearn
How to extract the dominant part of the Wilson loop average in higher representationsIn previous works, we have proposed a new formulation of Yang-Mills theory on the lattice so that the so-called restricted field obtained from the gauge-covariant decomposition plays the dominant…Ryutaro Matsudo, Akihiro Shibata, Seikou Kato et al.·Apr 20, 2019SaveLearn
Hadrons and NucleiThis document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for lattice QCD calculations related to the structure and spectroscopy of hadrons and…William Detmold, Robert G. Edwards, Jozef J. Dudek et al.·Apr 20, 2019SaveLearn
Numerical analyses of N=2 supersymmetric quantum mechanics with cyclic Leibniz rule on latticeWe study a cyclic Leibniz rule, which provides a systematic approach to lattice supersymmetry, using a numerical method with a transfer matrix. The computation is carried out in N=2 supersymmetric…Daisuke Kadoh, Takeru Kamei, Hiroto So·Apr 19, 2019SaveLearn
Strong dynamics with matter in multiple representations: SU(4) gauge theory with fundamental and sextet fermionsWe present a non-perturbative lattice study of SU(4) gauge theory with two flavors of fermions in the fundamental representation and two in the two-index antisymmetric representation: a theory…Guido Cossu, Luigi Del Debbio, Marco Panero et al.·Apr 18, 2019SaveLearn
Light-meson leptonic decay rates in lattice QCD+QEDThe leading electromagnetic (e.m.) and strong isospin-breaking corrections to the π+ μ+ ν[γ] and K+ μ+ ν[γ] leptonic decay rates are evaluated for the first time on the lattice. The…M. Di Carlo, D. Giusti, V. Lubicz et al.·Apr 18, 2019SaveLearn
Phase ambiguity of the measure for continuum Majorana fermionsIntegrating over a continuum Majorana fermion formally yields a functional pfaffian. We show that the phase of this pfaffian is ambiguous, as it depends on the choice of basis. This ambiguity is…Maarten Golterman, Yigal Shamir·Apr 18, 2019SaveLearn