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Title: Pion transverse charge density and the edge of hadrons

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1180600
Grant/Contract Number:
FG02-97ER-41014
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 90; Journal Issue: 2; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Carmignotto, Marco, Horn, Tanja, and Miller, Gerald A. Pion transverse charge density and the edge of hadrons. United States: N. p., 2014. Web. doi:10.1103/PhysRevC.90.025211.
Carmignotto, Marco, Horn, Tanja, & Miller, Gerald A. Pion transverse charge density and the edge of hadrons. United States. doi:10.1103/PhysRevC.90.025211.
Carmignotto, Marco, Horn, Tanja, and Miller, Gerald A. Fri . "Pion transverse charge density and the edge of hadrons". United States. doi:10.1103/PhysRevC.90.025211.
@article{osti_1180600,
title = {Pion transverse charge density and the edge of hadrons},
author = {Carmignotto, Marco and Horn, Tanja and Miller, Gerald A.},
abstractNote = {},
doi = {10.1103/PhysRevC.90.025211},
journal = {Physical Review C},
number = 2,
volume = 90,
place = {United States},
year = {Fri Aug 29 00:00:00 EDT 2014},
month = {Fri Aug 29 00:00:00 EDT 2014}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevC.90.025211

Citation Metrics:
Cited by: 5works
Citation information provided by
Web of Science

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  • We use the world data on the pion form factor for space-like kinematics and a technique used to extract the proton transverse densities, to extract the transverse pion charge density and its uncertainty due to experimental uncertainties and incomplete knowledge of the pion form factor at large values of Q2. The pion charge density at small values of b<0.1 fm is dominated by this incompleteness error while the range between 0.1-0.3 fm is relatively well constrained. A comparison of pion and proton charge densities shows that the pion is denser than the proton for values of b<0.2 fm. The pionmore » and proton distributions seem to be the same for values of b=0.2-0.6 fm. Future data from Jlab 12 GeV and the EIC will increase the dynamic extent of the data to higher values of Q2 and thus reduce the uncertainties in the extracted pion charge density.« less
  • The transverse charge density in the pion can be represented as a dispersion integral of the imaginary part of the pion form factor in the timelike region. This formulation incorporates information from e+e- annihilation experiments and allows one to reconstruct the transverse density much more accurately than from the spacelike pion form factor data alone. We calculate the transverse density using an empirical parametrization of the timelike pion form factor and estimate that it is determined to an accuracy of ~10% at a distance b ~ 0.1 fm, and significantly better at larger distances. The density is found to bemore » close to that obtained from a zero-width rho meson pole over a wide range and shows a pronounced rise at small distances. The resulting two-dimensional image of the fast-moving pion can be interpreted in terms of its partonic structure in QCD. We argue that the singular behavior of the charge density at the center requires a substantial presence of pointlike configurations in the pion's partonic wave function, which can be probed in other high-momentum transfer processes.« less
  • The transverse charge density of the pion is studied based on a realistic effective Lagrangian approach, where the pion is regarded as a quark-antiquark pair-bound state. Corrections from the two spin-1/2 constituent particles and from the correlation function of quark and antiquark inside the pion are addressed.
  • The transverse charge density in the pion can be represented as a dispersion integral of the imaginary part of the pion form factor in the timelike region. This formulation incorporates information from e{sup +}e{sup -} annihilation experiments and allows one to reconstruct the transverse density much more accurately than from the spacelike pion form factor data alone. We calculate the transverse density using an empirical parametrization of the timelike pion form factor and estimate that it is determined to an accuracy of {approx}10% at a distance b{approx}0.1 fm, and significantly better at larger distances. The density is found to bemore » close to that obtained from a zero-width {rho} meson pole over a wide range and shows a pronounced rise at small distances. The resulting two-dimensional image of the fast-moving pion can be interpreted in terms of its partonic structure in QCD. We argue that the singular behavior of the charge density at the center requires a substantial presence of pointlike configurations in the pion's partonic wave function, which can be probed in other high-momentum transfer processes.« less
  • Cited by 15