Abstract
The T2K Collaboration reports a precision measurement of muon neutrino disappearance with an off-axis neutrino beam with a peak energy of 0.6 GeV. Near detector measurements are used to constrain the neutrino flux and cross section parameters. The Super-Kamiokande far detector, which is 295 km downstream of the neutrino production target, collected data corresponding to protons on target. In the absence of neutrino oscillations, (syst) events are expected to be detected while only 58 muon neutrino event candidates are observed. A fit to the neutrino rate and energy spectrum, assuming three neutrino flavors and normal mass hierarchy yields a best-fit mixing angle and mass splitting . Our result corresponds to the maximal oscillation disappearance probability.
- Received 31 July 2013
DOI:https://doi.org/10.1103/PhysRevLett.111.211803
© 2013 American Physical Society