Measurements of two flavor νµ disappearance were made using K2K, the KEK to Kamioka long baseline neutrino oscillation experiment, data for three fiducial volume definitions at the far detector, Super-Kamiokande. A study was conducted on expanding the fiducial volume at Super-Kamiokande to show it is possible to expand it both symmetrically and shifted in the incoming neutrino beam direction. For the fiducial volume definitions, 112, 143, and 140 events are observed with an expectation of [special characters omitted], [special characters omitted], and [special characters omitted] events, respectively. A distortion is also seen in the reconstructed energy spectrum for single ring muon-like events for each fiducial volume. The probability that the observations are explained by no neutrino oscillations are 0.0021% (4.3σ), 0.018% (3.7σ), and 0.042% (3.5σ). The best fit values are sin2 2&thetas;=1.0 for all definitions and Δm2=0.0027 eV 2, 0.0025 eV2, and 0.0024 eV2, respectively. All results are consistent with other disappearance measurements.
|School:||State University of New York at Stony Brook|
|School Location:||United States -- New York|
|Source:||DAI-B 69/11, Dissertation Abstracts International|
|Keywords:||Fiducial volume, Neutrinos|
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