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Title: A new parameterization of the nucleon elastic form factors.

Abstract

The nucleon elastic form factors are generally interpreted as a mapping of the charge and magnetic current distributions of the proton and neutron. New high Q{sup 2} measurements have opened up fundamental questions about G{sub ep} that remain to be answered. This talk will summarize current developments surrounding the nucleon form factors and explain why they are important to neutrino physicists. New parameterizations of the nucleon form factors, suitable for use by neutrino physicists, will be introduced and discussed.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
947973
Report Number(s):
ANL/PHY/CP-118053
TRN: US0901484
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Journal Name: Nucl. Phys. B (Proc. Suppl.); Journal Volume: 159; Journal Issue: 2006; Conference: 4th International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region (NuInt05); Sep. 26, 2005 - Sep. 29, 2005; Okayama, Japan
Country of Publication:
United States
Language:
ENGLISH
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; FORM FACTORS; NEUTRINOS; NUCLEONS; PROTONS

Citation Formats

Bradford, R., Bodek, A., Budd, H., Arrington, J., Physics, and Univ. of Rochester. A new parameterization of the nucleon elastic form factors.. United States: N. p., 2006. Web. doi:10.1016/j.nuclphysbps.2006.08.028.
Bradford, R., Bodek, A., Budd, H., Arrington, J., Physics, & Univ. of Rochester. A new parameterization of the nucleon elastic form factors.. United States. doi:10.1016/j.nuclphysbps.2006.08.028.
Bradford, R., Bodek, A., Budd, H., Arrington, J., Physics, and Univ. of Rochester. Sun . "A new parameterization of the nucleon elastic form factors.". United States. doi:10.1016/j.nuclphysbps.2006.08.028.
@article{osti_947973,
title = {A new parameterization of the nucleon elastic form factors.},
author = {Bradford, R. and Bodek, A. and Budd, H. and Arrington, J. and Physics and Univ. of Rochester},
abstractNote = {The nucleon elastic form factors are generally interpreted as a mapping of the charge and magnetic current distributions of the proton and neutron. New high Q{sup 2} measurements have opened up fundamental questions about G{sub ep} that remain to be answered. This talk will summarize current developments surrounding the nucleon form factors and explain why they are important to neutrino physicists. New parameterizations of the nucleon form factors, suitable for use by neutrino physicists, will be introduced and discussed.},
doi = {10.1016/j.nuclphysbps.2006.08.028},
journal = {Nucl. Phys. B (Proc. Suppl.)},
number = 2006,
volume = 159,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

Conference:
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  • The nucleon elastic form factors are generally interpreted as a mapping of the charge and magnetic current distributions of the proton and neutron. New high Q{sup 2} measurements have opened up fundamental questions about G{sub ep} that remain to be answered. This talk will summarize current developments surrounding the nucleon form factors and explain why they are important to neutrino physicists. New parameterizations of the nucleon form factors, suitable for use by neutrino physicists, will be introduced and discussed.
  • A fundamental issue in hadron physics is which degrees of freedom are appropriate to describe exclusive reactions at experimentally accessible momentum transfers, and how are models at low, medium and high Q{sup 2} related? Constituent quark models (CQM) appear to work well at the low Q{sup 2} limit, and it is widely believed that valance pQCD will be valid in the limit of high Q{sup 2}. How far the validity of these models extend in Q{sup 2} is still an open question. Many exclusive reactions exhibit constituent scaling behavior at moderate Q{sup 2} ( few GeV{sup 2}/c{sup 2}) which ismore » interpreted by some [1] as the onset of perturbative QCD. Others [2] argue that the observed scaling is not a manifestation of pQCD, and that at the experimentally accessible range of Q{sup 2} exclusive reactions are explained primarily by soft Feynman mechanism. Recently[3][4], there have been promising developments in bridging the high and low Q{sup 2} extremes for exclusive reactions in terms of a quark-parton description of exclusive reactions In this approach the perturbative hard part of the reaction, which is calculable, is isolated from the non-perturbative soft, physics which is parameterized in terms of non-forward parton distributions (NFPD). These NFPD's are generalizations of the usual parton non-spin and spin distribution functions obtained in unpolarized and polarized deep inelastic inclusive scattering, and in fact reduce to them in the limit of forward scattering. An attractive aspect of this approach is that the same NFPD can be carried over to a variety of exclusive reactions which involve the same set of hadrons, and can be constrained in a number of different experiments which are discussed in these proceedings.« less
  • The nucleon form factors are still the subject of active investigation even after an experimental effort spanning 50 years. This is because they are of critical importance to our understanding of the electromagnetic properties of nuclei and provide a unique testing ground for QCD motivated models of nucleon structure. Progress in polarized beams, polarized targets and recoil polarimetry have allowed an important and precise set of data to be collected over the last decade. I will review the experimental status of elastic electron scattering from the nucleon along with an outlook for future progress.
  • The status of the electro-excitation program to study baryon resonances at Jefferson Lab will be exemplified by the most recent results on resonance parameters and transition form factors in single and double-pion production. These results demonstrate that the separation of resonance and background contributions and therefore the extraction of the electro-coupling amplitudes of resonances become easier and cleaner at higher four-momentum transfers (Q2). Furthermore, the double-pion in comparison to the single-pion channel shows a higher sensitivity to higher excited resonances and a distinctly different Q2 dependence of the background amplitudes. The combined analysis of the single- and double-pion data reducesmore » model dependent uncertainties significantly, which allows us to extract the resonant electrocoupling amplitudes with an unprecedented quality.« less