Determination of the MINOS  e beam rate from the measured   rate

1. Determination of the MINOS e beam rate from the measured  rate David Jaffe and Pedro Ochoa • 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

2. Summary of doc-3821 and plans • Measured rate of beam e wrt SKZP expectation is: total unc. stat Systematicuncertainty in (e)/() syst • Current and Projected uncertainties: + with total pHE MC sample, expect stat. uncertainty to drop from 24% to ~19% (mainly pHE data stats) • Projected final result, assuming no change in central value, is: • ( total unc.) Note: a comparable amount of pME data would greatly reduce the beam geometry and hadron prod. systematics D.Jaffe, P.Ochoa