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Two-photon exchange corrections to the pion form factor

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arxiv 0911.3619 v2 pith:AINC7IVJ submitted 2009-11-18 nucl-th hep-phnucl-ex

Two-photon exchange corrections to the pion form factor

classification nucl-th hep-phnucl-ex
keywords correctionspionexchangefactorformtwo-photonaccountangles
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We compute two-photon exchange corrections to the electromagnetic form factor of the pion, taking into account the finite size of the pion. Compared to the soft-photon approximation for the infrared divergent contribution which neglects hadron structure effects, the corrections are found to be < 1% for small Q^2 (Q^2 < 0.1 GeV^2), but increase to several percent for Q^2 > 1 GeV^2 at extreme backward angles.

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