A search for the appearance of tau neutrinos from numu a nu tau oscillations in the atmospheric neutrinos has been conducted using the atmospheric neutrino data from the Super-Kamiokande-I and the Super-Kamiokande-II experiment. A tau neutrino enriched event sample is selected by using the event topologies of the decay of tau leptons produced in charged-current weak interactions. An excess of tau neutrino signals is observed, and a best-fit tau neutrino appearance signal of 162 +/- 59 (stat.) +21-56 (sys.), which disfavors the no tau neutrino appearance hypothesis by 2.1 sigma. This is consistent with the expected number of tau neutrino events, 121 +/- 39 (sys.) for Deltam2 = 2.4 x 10-3eV2, assuming the full mixing in numu a nutau oscillations. The Super-Kamiokande atmospheric neutrino data are consistent with tau neutrino appearance from numu a nutau oscillations.As shown in a schematic diagram of the ID DAQ system of Figure 2.16, each ATM board accepts signals from 12 PMTs. Total of 948 ATM boards ... Two VME crates are installed in each electronics hut, and each VME is connected to 6 SMPs. The SMP ... The OD DAQ are rather simple compared to the ID DAQ. A schematicanbsp;...
|Title||:||Tau Neutrino Appearance Via Neutrino Oscillations in Atmospheric Neutrinos|
|Publisher||:||ProQuest - 2007|