Phys. Rev. C 62, 028201 (2000) [3 pages]Pion charge radius from charged pion electroproductionReceived 29 March 2000; published 10 July 2000 We analyze a low-energy theorem of threshold pion electroproduction which allows one to determine the charge radius of the pion. We show that at the same order where the radius appears, pion loops induce a correction to the momentum dependence of the longitudinal dipole amplitude L0+(-). This model-independent correction amounts to an increase of the pion charge radius squared from the electroproduction data by about 0.27 fm2. It sheds light on the apparent discrepancy between the recent determination of the pion radius from electroproduction data and the one based on pion-electron scattering. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.62.028201
DOI:
10.1103/PhysRevC.62.028201
PACS:
25.30.Rw, 14.40.Aq, 12.39.Fe
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