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arxiv: hep-ph/0107127 · v2 · submitted 2001-07-11 · ✦ hep-ph · hep-ex

Electromagnetic corrections to gamma pi(+) -> pi(0) pi(+)

classification ✦ hep-ph hep-ex
keywords gammacontributioncorrectionselectromagneticagreementamplitudeanalyzedanomalous
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The amplitude for the anomalous transitions gamma pi(+) -> pi(0) pi(+) is analyzed within Chiral Perturbation Theory including electromagnetic interactions. The presence of a t-channel one-photon exchange contribution induces sizeable e^2 corrections which enhance the cross-section in the threshold region and bring the theoretical prediction into agreement with available data. In the case of the crossed reaction gamma pi(0) -> pi(+) pi(-), the same contribution appears in the s-channel and its effects are small.

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