Abstract
We present double-differential measurements of anti-neutrino quasi-elastic scattering in the MINERvA detector. This study improves on a previous single differential measurement by using updated reconstruction algorithms and interaction models, and provides a complete description of observed muon kinematics in the form of a double-differential cross section with respect to muon transverse and longitudinal momentum. We include in our signal definition zero-meson final states arising from multi-nucleon interactions and from resonant pion production followed by pion absorption in the primary nucleus. We find that model agreement is considerably improved by a model tuned to MINERvA inclusive neutrino scattering data that incorporates nuclear effects such as weak nuclear screening and two-particle, two-hole enhancements.
Highlights
Quasielastic neutrino interactions are a key signal process for accelerator-based oscillation experiments, models of these interactions on nuclei have large (∼30%) uncertainties [1,2]
We report alternate results where the signal definition consists of interactions that were initially generated in GENIE as quasielastic, regardless of the final-state particles produced
Bkgd αβ is the estimated number of background events reconstructed in bin ðα; βÞ, U is an unfolding operation transforming reconstructed bin ðα; βÞ to true bin ði; jÞ, εij is the product of reconstruction efficiency and detector acceptance for events in true bin ði; jÞ, Φ is the flux of incoming antineutrinos, T is the number of scattering targets, and Δxi (Δyj) is the width of bin i (j)
Summary
Quasielastic neutrino interactions are a key signal process for accelerator-based oscillation experiments, models of these interactions on nuclei have large (∼30%) uncertainties [1,2] These arise from several sources, including nucleon form factors and final-state interactions wherein the produced particles interact further before exiting the primary nucleus. We include in our measurement events consistent with zero-meson final states arising from resonant pion production followed by pion absorption in the nucleus and from interactions on multinucleon states (frequently referred to as two-particle, two-hole or 2p2h). The Appendixes present additional results, including cross sections with alternate signal definitions; those planning to use the data are encouraged to use the Supplemental Material [14], which provide higher numerical precision
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