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## Determination of the MINOS e beam rate from the measured rate

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**Determination of the MINOS e beam rate from the measured** rate David Jaffe and Pedro Ochoa • We would like to produce a MINOS publication describing • the technique and results as described in doc-3821. The method is applicable to future long-baseline neutrino experiments with a near detector capable of muon charge-sign determination (e.g. T2K). • We describe work planned to update the results in doc-3821 and proceed to a publication draft for approval by the nue working group. D.Jaffe, P.Ochoa**Systematic uncertainty due**to (e)/() Summary of doc-3821 and plans • Measured rate of beam e wrt SKZP expectation is stat syst With total pHE MC sample, expect statistical uncertainty to drop from 24% to ~19% (mainly pHE data stats) Projected final result, assuming no change in central value, is Note that a comparable amount of pME data would greatly reduce the beam geometry and hadron production systematics. D.Jaffe, P.Ochoa