Measurement of the Charged Pion Electromagnetic Form Factor

Phys. Rev. Lett. 86, 1713 – Published 26 February 2001
J. Volmer et al. (The Jefferson Lab Fπ Collaboration)


Separated longitudinal and transverse structure functions for the reaction 1H(e,eπ+)n were measured in the momentum transfer region Q2=0.61.6 (GeV/c)2 at a value of the invariant mass W=1.95 GeV. New values for the pion charge form factor were extracted from the longitudinal cross section by using a recently developed Regge model. The results indicate that the pion form factor in this region is larger than previously assumed and is consistent with a monopole parametrization fitted to very low Q2 elastic data.


  • Received 17 October 2000
  • Published in the issue dated 26 February 2001

© 2001 The American Physical Society

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