NuMI Beam Study ν e component the LE beam configuration Benjamin Brown University of Pittsburgh

NuMI LE Configuration Contains ν μ, ν e ν μ absolute flux ~ 8.6 * / m 2 year 2.5 * PoT/year) ν e contamination absolute flux about %1

Predicted CC Events For the Fe configuration, EDDS absorber mass ~0.4 tons, for Pb, ~0.55 tons 2.5 * PoT/year) Pb gives: 1500 CC e / year 110K CC μ / year Fe gives 1100 CC e / year 76K CC μ / year

ν e Flux Measurement Look for electron production spectrum (presently, as generated by MC)

Electron Spectrum

Electron tan(θ) distribution

ν e expected flux

Summary Almost all electrons have E >~ 100 MeV Almost all electrons are forward scattered. ~60% with tan(θ) < 0.4

Conclusion If we are restricted to electrons with: a) tan(θ) < 0.4 b) electron id efficiency of about 90% c) Pb configuration d) lose 10% due to e exiting the downstream edge of the brick Then, in 1 year, we can expect a signal of ~700 events. 2.5 * PoT/year)

References MINER ν A proposal “Request for a Test Exposure of OPERA Targets in the Numb Beam”, K. Kadoma et al “Study of electron identificationin a few GeV region by an emulsion cloud chamber”, K. Kadoma et al; Review of Scientific Instruments, Vol. 74, Number 1, January 2003