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The off-Shell Electromagnetic Vertex of the Nucleon in Chiral Perturbation Theory

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arxiv hep-ph/9305233 v1 pith:2IFCWHP3 submitted 1993-05-10 hep-ph

classification hep-ph
keywords vertexchiralelectromagneticmassnucleonoff-shellperturbationtheory
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abstract

We study the electromagnetic vertex of a nucleon in next-to-leading order chiral perturbation theory (CPT). We consider the case where one of the nucleons at the $\gamma$NN vertex is off its mass shell. We define relevant measures for the off-shell dependence in the limited kinematical range allowed, and analyze their expansion in the pion mass. The leading nonanalytic contributions are calculated to estimate their size.

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  1. Revisiting Gauge Ambiguities for DUNE Precision

    hep-ph 2025-02 conditional novelty 6.0 of 10

    Gauge-restoration and form-factor-scale ambiguities in the plane-wave impulse approximation produce 2-10% shifts in quasielastic cross sections, exceeding DUNE's few-percent target; an off-shell spinor method is proposed.

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