Constraint of the MINER nu A medium energy neutrino flux using neutrino-electron elastic scattering

Elastic neutrino scattering on electrons is a precisely known purely leptonic process that provides a standard candle for measuring neutrino flux in conventional neutrino beams. Using a total sample of 810 neutrino-electron scatters after background subtraction, the measurement reduces the normalization uncertainty on the nu(mu) NuMI beam flux between 2 and 20 GeV from 7.6 to 3.9%. This is the mostprecise measurement of neutrino-electron scattering to date, will reduce uncertainties on MINER nu A's absolute cross section measurements, and demonstrates a technique that can be used in future neutrino beams such as long baseline neutrino facility.