3 Jan 2008 D.Jaffe, P.Ochoa 1

Determination of the MINOS e beam rate from the measured rate

• Would like to produce a MINOS publication describingthe 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.

David Jaffe and Pedro OchoaDavid Jaffe and Pedro Ochoa

3 Jan 2008 D.Jaffe, P.Ochoa 2

Summary of doc-3821 and plans

• Measured rate of beam e wrt SKZP expectation is:

total unc.stat syst

Systematic Current Projected Comment

Beam geometry 17.2 17.2

Hadron production 15.0 10.0 Improve est. from SKZP

Background <1 <1

Efficiency 8 4 W.G. studies

cross-section 1.9 1.9

Total in quad. 24.3% 20.4%

+ with total pHE MC sample, expect stat. uncertainty to drop from 24% to

~19% (mainly pHE data stats)

Systematic uncertainty in (e)/()

Projected final result, assuming no change in central value, is:

( total unc.)

• Current and Projected uncertainties:

Note: a comparable amount of pME data would greatly reduce the beam geometry and hadron prod. systematics