Measurement of Triple-Differential Cross Section of Quasielastic-like anti-ν_μ scattering with 〈E_ν〉 ≈ 6 GeV on Hydrocarbon at MINERvA

We present a method to simultaneously measure leptonic and hadronic kinematics of charged current quasielastic-like (CCQE-like) scattering of muon antineutrinos on hydrocarbon at MINERvA and preliminary measurements of the triple-differential cross section. This measurement uses the Medium Energy (ME) configuration of the wideband NuMI beam at Fermilab with a peak at 〈E_ν〉 ≈ 6 GeV. This 3D analysis uses new methods of event selection and background constraint to allow exploration of events with high recoil activity, extending previous MINERvA 2D cross section results in both the Low and Medium Energy configurations of NuMI. These new methods allow extraction of the first triple-differential cross section of QE-like antineutrino scattering as a function of muon momentum parallel (p_∥) and transverse (p_T) to the beam, and hadronic recoil observed by the detector. This higher dimensional phase space and inclusion of high recoil events examines an area where antineutrino interaction models are incomplete.