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.
Contribution of two particle-two hole final states to the nuclear response
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abstract
The excitation of two particle-two hole final states in neutrino-nucleus scattering has been advocated by many authors as the source of the excess cross section observed by the MiniBooNE Collaboration in the quasi elastic sector. We analyse the mechanisms leading to the appearance of these final states, and illustrate their significance through the results of accurate calculations of the nuclear electromagnetic response in the transverse channel. A novel approach, allowing for a consistent treatment of the amplitudes involving one- and two-nucleon currents in the kinematical region in which the non relativistic approximation breaks down, is outlined.
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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.