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Information on the structure of the rho meson from the pion form-factor · Around

2009

Information on the structure of the rho meson from the pion form-factor

Leupold, Stefan

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The electromagnetic pion form-factor is calculated in a Bethe-Salpeter approach which accounts for pion rescattering.

In the scattering kernel the pion-pion contact interaction from lowest-order chiral perturbation theory is considered together with an optional vector meson in the s-channel.
Correspondingly the virtual photon couples to a two-pion state and optionally to the vector meson.
It is shown that for reasonable ranges of input parameters the experimentally observed pion form-factor cannot be described by the iterated pion-pion contact interaction alone, i.e.

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