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.
The off-Shell Electromagnetic Vertex of the Nucleon in Chiral Perturbation Theory
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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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Revisiting Gauge Ambiguities for DUNE Precision
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.