Watabe, Masaki (2010-05). Using Quasi-elastic Events to Measure Neutrino Oscillations with MINOS Detectors in the NuMI Neutrino Beam. Doctoral Dissertation. Thesis uri icon

abstract

  • MINOS (Main Injector Neutrino Oscillation Search) experiment has been designed to search for a change in the avor composition of a beam of muon neutrinos as they travel between the Near Detector at Fermi National Accelerator Laboratory and the Far Detector in the Soudan mine in Minnesota, 735 km from the target. The MINOS oscillation analysis is mainly performed with the charged current (CC) events and sensitive to constrain high-delta m2 values. However, the quasi-elastic (QEL) charged current interaction is dominant in the energy region important to access low-delta m2 values. For further improvement, the QEL oscillation analysis is performed in this dissertation. A data sample based on a total of 2.50 x 1020 POT is used for this analysis. In summary, 55 QEL-like events are observed at the Far detector while 87.06 +/- 13.17 (syst:) events are expected with null oscillation hypothesis. These data are consistent with vm disappearance via oscillation with delta m2 = 2.10 +/- 0.37 (stat:) +/- 0.24 (syst:) eV2 and the maximal mixing angle.
  • MINOS (Main Injector Neutrino Oscillation Search) experiment has been designed
    to search for a change in the
    avor composition of a beam of muon neutrinos
    as they travel between the Near Detector at Fermi National Accelerator Laboratory
    and the Far Detector in the Soudan mine in Minnesota, 735 km from the target.
    The MINOS oscillation analysis is mainly performed with the charged current
    (CC) events and sensitive to constrain high-delta m2 values. However, the quasi-elastic
    (QEL) charged current interaction is dominant in the energy region important to
    access low-delta m2 values. For further improvement, the QEL oscillation analysis is performed
    in this dissertation. A data sample based on a total of 2.50 x 1020 POT
    is used for this analysis. In summary, 55 QEL-like events are observed at the
    Far detector while 87.06 +/- 13.17 (syst:) events are expected with null oscillation
    hypothesis. These data are consistent with vm disappearance via oscillation with
    delta m2 = 2.10 +/- 0.37 (stat:) +/- 0.24 (syst:) eV2 and the maximal mixing angle.

publication date

  • May 2010