Search for Differences in Oscillation Parameters for Atmospheric Neutrinos and Antineutrinos at Super-Kamiokande
Super-Kamiokande Collaboration: K. Abe, Y. Hayato, T. Iida, M. Ikeda,, K. Iyogi, J. Kameda, Y. Koshio, Y. Kozuma, M. Miura, S. Moriyama, M., Nakahata, S. Nakayama, Y. Obayashi, H. Sekiya, M. Shiozawa, Y. Suzuki, A., Takeda, Y. Takenaga, Y. Takeuchi, K. Ueno, K. Ueshima
TL;DR
This study searches for differences in atmospheric neutrino and antineutrino oscillation parameters at Super-Kamiokande, finding no significant differences and confirming consistency with previous measurements.
Contribution
It provides the first direct comparison of neutrino and antineutrino oscillation parameters using Super-Kamiokande atmospheric data.
Findings
No evidence for differences in oscillation parameters.
Best fit antineutrino parameters are (2.0x10^-3 eV^2, 1.0).
Results are consistent with previous measurements.
Abstract
We present a search for differences in the oscillations of antineutrinos and neutrinos in the Super-Kamiokande -I, -II, and -III atmospheric neutrino sample. Under a two-flavor disappearance model with separate mixing parameters between neutrinos and antineutrinos, we find no evidence for a difference in oscillation parameters. Best fit antineutrino mixing is found to be at (dm2bar, sin2 2 thetabar) = (2.0x10^-3 eV^2, 1.0) and is consistent with the overall Super-K measurement.
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