Measurement of the Neutrino Neutral-Current Elastic Differential Cross Section

Abstract

We report a measurement of the flux-averaged neutral-current elastic differential cross section for neutrinos scattering on mineral oil (CH${}_2$) as a function of four-momentum transferred squared. It is obtained by measuring the kinematics of recoiling nucleons with kinetic energy greater than 50~MeV which are readily detected in MiniBooNE. This differential cross-section distribution is fit with fixed nucleon form factors apart from an axial mass, $M_A$, that provides a best fit for $M_A=1.39\pm 0.11$~GeV. Additionally, single protons with kinetic energies above 350 MeV can be distinguished from neutrons and multiple nucleon events. Using this marker, the strange quark contribution to the neutral-current axial vector form factor at $Q^2=0$, $\hat{I}”s$, is found to be $\hat{I}”s=0.08\pm 0.26$.

17 pages, 15 figures and 4 tables