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Title: Hadron Structure from Lattice QCD

Abstract

The structure of neutrons, protons, and other strongly interacting particles is now being calculated in full, unquenched lattice QCD with quark masses entering the chiral regime. This talk describes selected examples, including the nucleon axial charge, structure functions, electromagnetic form factors, the origin of the nucleon spin, the transverse structure of the nucleon, and the nucleon to Delta transition form factor.

Authors:
;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
892153
Report Number(s):
JLAB-THY-05-462; DOE/ER/40150-4051; hep-lat/0509101
TRN: US0605551
DOE Contract Number:
AC05-84ER40150
Resource Type:
Conference
Resource Relation:
Conference: International Conference on QCD and Hadronic Physics, 16-20 Jun 2005, Beijing, China
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ELECTROMAGNETIC FORM FACTORS; FORM FACTORS; HADRONS; NEUTRONS; NUCLEONS; ORIGIN; PHYSICS; PROTONS; QUANTUM CHROMODYNAMICS; QUARKS; SPIN; STRUCTURE FUNCTIONS

Citation Formats

Robert Edwards, and David Richards. Hadron Structure from Lattice QCD. United States: N. p., 2006. Web.
Robert Edwards, & David Richards. Hadron Structure from Lattice QCD. United States.
Robert Edwards, and David Richards. Wed . "Hadron Structure from Lattice QCD". United States. doi:. https://www.osti.gov/servlets/purl/892153.
@article{osti_892153,
title = {Hadron Structure from Lattice QCD},
author = {Robert Edwards and David Richards},
abstractNote = {The structure of neutrons, protons, and other strongly interacting particles is now being calculated in full, unquenched lattice QCD with quark masses entering the chiral regime. This talk describes selected examples, including the nucleon axial charge, structure functions, electromagnetic form factors, the origin of the nucleon spin, the transverse structure of the nucleon, and the nucleon to Delta transition form factor.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2006},
month = {Wed Feb 01 00:00:00 EST 2006}
}

Conference:
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  • Electromagnetic form factors and radiative transition amplitudes of hadrons are calculated in lattice QCD formalism. Calculated results for the charge radii of pi- and rho-mesons are compared with experimental results. Also, the calcualted transition strength for radiative-decay of vector-mesons is compared with experimental results. (AIP)
  • The structure of neutrons, protons, and other strongly interacting particles in terms of their quark and gluon constituents can be calculated from first principles by solving QCD on a discrete space-time lattice. With the advent of SciDAC software and prototype clusters and of DOE supported dedicated lattice QCD computers, it is now possible to calculate physical observables using full QCD in the regime of large lattice volumes and light quark masses that can be compared with experiment. This talk will describe selected examples, including the nucleon axial charge, structure functions, electromagnetic form factors, the origin of the nucleon spin, themore » transverse structure of the nucleon, and the nucleon to Delta transition form factor.« less
  • No abstract prepared.
  • Early scattering experiments revealed that the proton was not a point particle but a bound state of many quarks and gluons. Deep inelastic scattering (DIS) experiments have accurately determined the probability of struck quarks carrying a fraction of the proton's momentum. The current generation of experiments and Lattice QCD calculations will provide detailed multi-dimensional pictures of the distributions of quarks and gluons inside the proton.
  • A variety of evidence from lattice QCD is presented revealing the dominant role of instantons in the propagation of light quarks in the QCD vacuum and in light hadron structure. The instanton content of lattice gluon configurations is extracted, and observables calculated from the instantons alone are shown to agree well with those calculated using all gluons. The lowest 128 eigenfunctions of the Dirac operator are calculated and shown to exhibit zero modes localized at the instantons. Finally, the zero mode contributions to the quark propagator alone are shown to account for essentially the full strength of the rho andmore » pion resonances in the vector and pseudoscalar correlation functions. {copyright} {ital 1997 American Institute of Physics.}« less