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Two independent methods are employed to measure the neutrino flux of theanti-neutrino-mode beam observed by the MiniBooNE detector. The first methodcompares data to simulated event rates in a high purity $\numu$ inducedcharged-current single $\pip$ (CC1$\pip$) sample while the second exploits thedifference between the angular distributions of muons created in $\numu$ and$\numub$ charged-current quasi-elastic (CCQE) interactions. The results fromboth analyses indicate the prediction of the neutrino flux component of thepre-dominately anti-neutrino beam is over-estimated - the CC1$\pip$ analysisindicates the predicted $\numu$ flux should be scaled by $0.76 \pm 0.11$, whilethe CCQE angular fit yields $0.65 \pm 0.23$. The energy spectrum of the fluxprediction is checked by repeating the analyses in bins of reconstructedneutrino energy, and the results show that the spectral shape is well modeled.These analyses are a demonstration of techniques for measuring the neutrinocontamination of anti-neutrino beams observed by future non-magnetizeddetectors.

Measurement of the neutrino component of an anti-neutrino beam observed by a non-magnetized detector