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.
A New Method for Helicity Calculations
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abstract
We propose a new helicity formalism based on the formal insertion in spinor lines of a complete set of states build up with unphysical spinors. The method is developed both for massless and massive fermions for which it turns out to be particularly fast. All relevant formulae are given.
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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.