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NuMI Beam Study

This study investigates the neutrino electron (νe) component of the NuMI beam configuration, focusing on the absolute fluxes and expected contamination from νμ. The setup at the University of Pittsburgh demonstrates significant flux measurements, revealing that the fluxes for iron and lead configurations yield distinct charged current events. The study anticipates around 700 detectable events per year under specified conditions, emphasizing the importance of electron production spectra and identification efficiency. Key references cite foundational proposals and studies in the field.

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NuMI Beam Study

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  1. NuMI Beam Study νe component the LE beam configuration Benjamin Brown University of Pittsburgh

  2. NuMI LE Configuration • Contains νμ, νe • νμ absolute flux ~ 8.6 * 1016 / m2 year (@ 2.5 * 1020 PoT/year) • νe contamination absolute flux about %1

  3. Predicted CC Events • For the Fe configuration, EDDS absorber mass ~0.4 tons, for Pb, ~0.55 tons (@ 2.5 * 1020 PoT/year) • Pb gives:1500 CC e / year110K CC μ / year • Fe gives1100 CC e / year76K CC μ / year

  4. νe Flux Measurement • Look for electron production spectrum (presently, as generated by MC)

  5. Electron Spectrum

  6. Electron tan(θ) distribution

  7. νe expected flux

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

  9. Conclusion • If we are restricted to electrons with: a) tan(θ) < 0.4b) electron id efficiency of about 90%c) Pb configurationd) 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 * 1020 PoT/year)

  10. References • MINERνA 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

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