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Title: Pion transverse charge density and the edge of hadrons

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 pion 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.
 [1] ;  [1] ;  [2]
  1. Catholic University of America
  2. University of Washington
Publication Date:
OSTI Identifier:
Report Number(s):
JLAB-THY-14-1932; DOE/OR/23177-3168; arXiv:1404.1539
Journal ID: ISSN 0556--2813; NSF grants PHY-1019521, PHY-1306227, and USDOE Grant no. DE-FG02-97ER-41014
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys.Rev.C; Journal Volume: 90; Journal Issue: 02
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States