Double-Differential Cross Section and 2p2h Contribution using ν_{µ} CC Interactions in the NOvA Near Detector

This Poster presents two related measurements. Firstly, the inclusive, charged-current double-differential cross section for, νμ scattering on the predominantly hydrocarbon medium of the Nova, near detector is obtained, expressed in terms of three-momentum transfer and available hadronic energy: d2σ/d|q⃗ |dEavail. The cross section is compared to GENIE-based Monte Carlo predictions that utilize four different models of the 2-particle-2-hole (2p2h) contribution. Secondly, the composition of the selected event sample across the |q⃗ | versus Eavail phase space is characterized using GENIE-based event distributions (templates) that represent scattering processes on single bound nucleons (1p1h), namely baryon-resonance production (RES), inelastic scattering (DIS), quasi-elastic scattering (QE), and Other (ν¯¯¯μ, NC, coherent scattering). The normalizations of the RES and DIS templates are adjusted by fitting to a control sample comprised of RES and DIS and devoid of QE, Other, and 2p2h reactions. A bin-by-bin subtraction of the templates from the selected event sample yields an estimate for the distribution of 2p2h events over the plane of |q⃗ | versus Eavail. The distribution is then converted into a differential cross section for 2p2h reactions. Significant 2p2h rate is observed in the contiguous region 0.3 ≤,qthree,≤, 1.0 GeV/c with 0.0 ≤,eavail,≤ 0.35 GeV.