scholarly journals Lattice Quantum Chromodynamics (SPI, mapping, site ordering, and QPX in Lattice QCD code on Mira): ALCF-2 Early Science Program Technical Report

2013 ◽  
Author(s):  
H. Na ◽  
J. Osborn
Keyword(s):  
Quantum Chromodynamics ◽  
Lattice Qcd ◽  
Science Program ◽  
Lattice Quantum Chromodynamics ◽  
Technical Report ◽  
Lattice Quantum

The pion form factor from twisted-mass lattice quantum chromodynamics

2006 ◽  
Vol 84 (6-7) ◽  
pp. 661-668
Author(s):  
A M Abdel-Rehim ◽  
R Lewis
Keyword(s):  
Form Factor ◽  
Quantum Chromodynamics ◽  
Lattice Qcd ◽  
Pion Form Factor ◽  
Explicit Computation ◽  
Lattice Quantum Chromodynamics ◽  
Zero Modes ◽  
Twisted Mass ◽  
Lattice Quantum ◽  
Insight Into

The pion form factor offers insight into the transition from perturbative to nonperturbative quantum chromodynamics (QCD), and is of current experimental interest. Twisted-mass lattice QCD is a method for eliminating unphysical zero modes from Wilson lattice simulations; it also allows for removal of the leading lattice spacing artifacts through a momentum-averaging prescription. In our study of the pion form factor, we performed the first explicit computation with momentum averaging in twisted-mass lattice QCD, and the first use of the GMRES-DR algorithm for twisted fermion matrix inversion.PACS No.: 12.38.Gc

UKQCD software for lattice quantum chromodynamics

2009 ◽  
Vol 367 (1897) ◽  
pp. 2585-2594
Author(s):  
P.A. Boyle ◽  
R.D. Kenway ◽  
C.M. Maynard
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Quantum Chromodynamics ◽  
Lattice Qcd ◽  
Nuclear Interaction ◽  
Quantum Field ◽  
Lattice Quantum Chromodynamics ◽  
The Us ◽  
Lattice Quantum ◽  
Familiar Objects

Quantum chromodynamics (QCD) is the quantum field theory of the strong nuclear interaction and it explains how quarks and gluons are bound together to make more familiar objects such as the proton and neutron, which form the nuclei of atoms. UKQCD is a collaboration of eight UK universities that have come together to obtain and pool sufficient resources, both computational and manpower, to perform lattice QCD calculations. This paper explains how UKQCD uses and develops this software, how performance critical kernels for diverse architectures such as quantum chromodynamics-on-a-chip, BlueGene and XT4 are developed and employed and how UKQCD collaborates both internally and externally, with, for instance, the US SciDAC lattice QCD community.

scholarly journals The sigma meson from lattice QCD with two-pion interpolating operators

2017 ◽  
Vol 28 (10) ◽  
pp. 1750124 ◽  
Author(s):  
Dean Howarth ◽  
Joel Giedt
Keyword(s):  
Quantum Chromodynamics ◽  
Lattice Qcd ◽  
Correlation Functions ◽  
Momentum Space ◽  
Physical Point ◽  
Lattice Quantum Chromodynamics ◽  
Novel Technique ◽  
Lattice Quantum ◽  
Sigma Meson

In this paper, we describe our studies of the sigma meson, [Formula: see text], using two-pion correlation functions. We use lattice quantum chromodynamics in the quenched approximation with so-called clover fermions. By working at unphysical pion masses we are able to identify a would-be resonance with mass less than [Formula: see text], and then extrapolate to the physical point. We include the most important annihilation diagram, which is “partially disconnected” or “single annihilation”. Because this diagram is quite expensive to compute, we introduce a somewhat novel technique for the computation of all-to-all diagrams, based on momentum sources and a truncation in momentum space. In practice, we use only [Formula: see text] modes, so the method reduces to wall sources. At the point where the mass of the pion takes its physical value, we find a resonance in the [Formula: see text] two-pion channel with a mass of approximately [Formula: see text] MeV, consistent with the expected properties of the sigma meson, given the approximations we are making.

Lattice QCD on GPU clusters, using the QUDA library and the Chroma software system

2012 ◽  
Vol 26 (4) ◽  
pp. 386-398 ◽  
Author(s):  
Bálint Joó ◽  
Mike A. Clark
Keyword(s):  
Quantum Chromodynamics ◽  
Graphics Processing Units ◽  
Lawrence Livermore National Laboratory ◽  
National Laboratory ◽  
Application Framework ◽  
Software System ◽  
Nuclear Forces ◽  
Lattice Quantum Chromodynamics ◽  
Lattice Quantum ◽  
Strong Scaling

The QUDA library for optimized lattice quantum chromodynamics using GPUs, combined with a high-level application framework such as the Chroma software system, provides a powerful tool for computing quark propagators, a key step in current calculations of hadron spectroscopy, nuclear structure, and nuclear forces. In this contribution we discuss our experiences, including performance and strong scaling of the QUDA library and Chroma on the Edge Cluster at Lawrence Livermore National Laboratory and on various clusters at Jefferson Lab. We highlight some scientific successes and consider future directions for graphics processing units in lattice quantum chromodynamics calculations.

scholarly journals Magnetic Moments of Light Nuclei from Lattice Quantum Chromodynamics

2014 ◽  
Vol 113 (25) ◽  
Author(s):  
S. R. Beane ◽  
E. Chang ◽  
S. Cohen ◽  
W. Detmold ◽  
H. W. Lin ◽  
...  
Keyword(s):  
Quantum Chromodynamics ◽  
Magnetic Moments ◽  
Light Nuclei ◽  
Lattice Quantum Chromodynamics ◽  
Lattice Quantum

scholarly journals Baryon-baryon interactions and spin-flavor symmetry from lattice quantum chromodynamics

2017 ◽  
Vol 96 (11) ◽  
Author(s):  
Michael L. Wagman ◽  
Frank Winter ◽  
Emmanuel Chang ◽  
Zohreh Davoudi ◽  
William Detmold ◽  
...  
Keyword(s):  
Quantum Chromodynamics ◽  
Flavor Symmetry ◽  
Lattice Quantum Chromodynamics ◽  
Lattice Quantum

scholarly journals THE ELECTROMAGNETIC FORM FACTOR OF THE PION: RESULTS FROM THE LATTICE

2013 ◽  
Vol 22 (12) ◽  
pp. 1330030 ◽  
Author(s):  
BASTIAN B. BRANDT
Keyword(s):  
Form Factor ◽  
Quantum Chromodynamics ◽  
Quality Criteria ◽  
Vector Form ◽  
Physical Point ◽  
Lattice Quantum Chromodynamics ◽  
Lattice Quantum ◽  
Future Challenges ◽  
Recent Developments ◽  
Systematic Effects

This review contains an overview over recent results for the electromagnetic iso-vector form factor of the pion obtained in lattice quantum chromodynamics (QCD) with dynamical fermions. Particular attention is given to the extrapolation to the physical point and an easy assessment of the control over the main systematic effects by imposing quality criteria and an associated sign code, similar to the ones used by the FLAG working group. Also included is a brief discussion of recent developments and future challenges concerning the accurate extraction of the form factor in the lattice framework.

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