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Title: Covariance dynamics and symmetries, and hadron form factors.

Abstract

We summarize applications of Dyson-Schwinger equations to the theory and phenomenology of hadrons. Some exact results for pseudoscalar mesons are highlighted with details relating to the U{sub A}(1) problem. We describe inferences from the gap equation relating to the radius of convergence for expansions of observables in the current-quark mass. We recapitulate upon studies of nucleon electromagnetic form factors, providing a comparison of the ln-weighted ratios of Pauli and Dirac form factors for the neutron and proton.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
970796
Report Number(s):
ANL/PHY/CP-60302
TRN: US1000915
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: Exclusive Reactions at High Momentum Transfer; May 21, 2007 - May 24, 2007; Newport News, VA
Country of Publication:
United States
Language:
ENGLISH
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CONVERGENCE; DIRAC FORM FACTORS; ELECTROMAGNETIC FORM FACTORS; FORM FACTORS; HADRONS; MOMENTUM TRANSFER; NEUTRONS; NUCLEONS; PSEUDOSCALAR MESONS

Citation Formats

Bhagwat, M. S., Cloet, I. C., Roberts, C. D., and Physics. Covariance dynamics and symmetries, and hadron form factors.. United States: N. p., 2007. Web. doi:10.1142/9789812796950_0010.
Bhagwat, M. S., Cloet, I. C., Roberts, C. D., & Physics. Covariance dynamics and symmetries, and hadron form factors.. United States. doi:10.1142/9789812796950_0010.
Bhagwat, M. S., Cloet, I. C., Roberts, C. D., and Physics. Mon . "Covariance dynamics and symmetries, and hadron form factors.". United States. doi:10.1142/9789812796950_0010.
@article{osti_970796,
title = {Covariance dynamics and symmetries, and hadron form factors.},
author = {Bhagwat, M. S. and Cloet, I. C. and Roberts, C. D. and Physics},
abstractNote = {We summarize applications of Dyson-Schwinger equations to the theory and phenomenology of hadrons. Some exact results for pseudoscalar mesons are highlighted with details relating to the U{sub A}(1) problem. We describe inferences from the gap equation relating to the radius of convergence for expansions of observables in the current-quark mass. We recapitulate upon studies of nucleon electromagnetic form factors, providing a comparison of the ln-weighted ratios of Pauli and Dirac form factors for the neutron and proton.},
doi = {10.1142/9789812796950_0010},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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  • We provide a snapshot of Dyson-Schwinger equation applications to the theory and phenomenology of hadrons. Exact results for pseudoscalar mesons are highlighted, with details relating to the U A(1) problem. Calculated masses of the lightest J=0,1 states are discussed. We recapitulate upon studies of nucleon properties and give a perspective on the contribution of quark orbital angular momentum to the spin of a nucleon at rest.
  • We discuss the electromagnetic form factors, axial form factors, and structure functions of a nucleon bound in the quark-meson coupling (QMC) model. Free space nucleon form factors are calculated using the improved cloudy bag model (ICBM). After describing finite nuclei and nuclear matter in the quark-based (EMC) model, the in-medium modification of the bound nucleon form factors is calculated in the same model. Finally, the bound nucleon structure function, F2, is extracted using the calculated in-medium electromagnetic form factors and Bloom-Gilman (quark-hadron) duality.
  • No abstract prepared.
  • We study the large-Q{sup 2} behavior of the meson form factor F{sub M} (Q{sup 2}) constructed using the holographic light-front wave functions.
  • We present several recent results from the BaBar collaboration in the areas of initial state radiation physics and transition form factors. An updated study of the processes e{sup +}e{sup -} {yields} K{sup +}K{sup -}{pi}{sup +}{pi}{sup -} and e{sup +}e{sup -} {yields} K{sup +}K{sup -}{pi}{sup 0}{pi}{sup 0} provides an improved understanding of the Y (2175) meson. A very precise study of the process e{sup +}e{sup -} {yields} {pi}{sup +}{pi}{sup -} improves the precision on the calculated anomalous magnetic moment of the muon and provides by far the best information on excited {rho} states. Our previous measurements of the timelike transition formmore » factors (TFF) of the {eta} and {eta}' mesons at Q{sup 2} = 112 GeV{sup 2}, combined with new measurements of the their spacelike TFFs and those of the {pi}{sup 0} and {eta}{sub c} mesons, provide powerful tests of QCD and models of the distribution amplitudes of quarks inside these mesons. The {eta}{sub c} TFF shows the expected behavior over the Q{sup 2} range 1-50 GeV{sup 2}, and we are sensitive to next-to-leading-order QCD corrections. The {eta} and {eta}' TFFs are consistent with expected behavior, but those for the {pi}{sup 0} are not. Extracting the strange and nonstrange components of the {eta} and {eta}' TFFs, we find the nonstrange component to be consistent with theoretical expectations and inconsistent with the measured {pi}{sup 0} TFF.« less