| This work attempts to measure or set a limit on sin2(2theta 13), the parameter which describes numu→nu e oscillations. The MINOS detectors at Fermilab are used to perform a search for the oscillations utilizing a beam of nu mu neutrinos created in the NuMI beamline by the collisions of 120 GeV protons with a carbon target. These collisions create pi +/- and K+/- which are focused with magnetic horns, are allowed to decay, and result in a beam of numu in the energy range of 1 to 30 GeV. Two functionally identical steel-scintillator calorimetric detectors are utilized to measure the interactions of the generated neutrinos. A detector close to the NuMI beam. located 104 m underground and 1040 m from the target, is used to measure the properties of the neutrino beam, including the flux, composition, and energy spectrum. This information is used in part to generate a predicted spectrum of neutrinos in absence of numu→nu e oscillations in the detector located far from the target, at a distance of 705 in underground and 735.5 km from the target. An excess of predicted nue charged current events in this far detector will be interpreted as numu→nu eoscillations, and a measurement of sin2(2theta 13) will be made using a Feldman-Cousins analysis.;The measurement of numu→nue requires the separation of nue candidates from background events. New reconstruction software was developed with a focus on identifying nue candidate events in order to reduce systematic errors. The event parameters measured by this software were used as an input to an artificial neutral network event discriminator. The details of this reconstruction software and the other steps of the analysis necessary to making the measurement will be discussed.;This work builds on a previous measurement made with this experiment. After two years of running with 3.14x1020 protons-on-target (POT), a limit was set at deltaCP=0 for the normal (inverted) hierarchy of sin2(2theta13)<0.29 (0.42) at 90% C.L. This study finds after four years of data with an accumulated intensity of 7x1020 POT that sin2(2theta 13)<0.12 (0.20) with deltaCP=0 at 90% C.L. for the normal (inverted) hierarchy. |
