Two Particle-Hole Excitations in Charged Current Quasielastic Antineutrino--Nucleus Scattering
J. Nieves, I. Ruiz Simo, M.J. Vicente Vacas
TL;DR
This paper evaluates quasielastic and multinucleon contributions to antineutrino-nucleus scattering cross sections using a local Fermi gas model with RPA correlations, comparing results with MiniBooNE data and analyzing 2p2h event relevance.
Contribution
It introduces a systematic many-body expansion approach for multinucleon contributions in antineutrino scattering without new parameters, extending previous neutrino models.
Findings
Model agrees with MiniBooNE data for antineutrino scattering
Multinucleon effects significantly impact energy reconstruction
2p2h events are relevant for accurate antineutrino energy estimation
Abstract
We evaluate the quasielastic and multinucleon contributions to the antineutrino nucleus scattering cross section and compare our results with the recent MiniBooNE data. We use a local Fermi gas model that includes RPA correlations and gets the multinucleon part from a systematic many body expansion of the boson selfenergy in the nuclear medium. The same model had been quite successful for the neutrino cross section and contains no new parameters. We have also analysed the relevance of 2p2h events for the antineutrino energy reconstruction.
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