Abstract
The T2K experiment has observed electron neutrino appearance in a muon neutrino beam produced 295 km from the Super-Kamiokande detector with a peak energy of 0.6 GeV. A total of 28 electron neutrino events were detected with an energy distribution consistent with an appearance signal, corresponding to a significance of when compared to expected background events. In the Pontecorvo-Maki-Nakagawa-Sakata mixing model, the electron neutrino appearance signal depends on several parameters including three mixing angles , , , a mass difference and a violating phase . In this neutrino oscillation scenario, assuming , , and (), a best-fit value of () is obtained at . When combining the result with the current best knowledge of oscillation parameters including the world average value of from reactor experiments, some values of are disfavored at the 90% C.L.
- Received 19 November 2013
DOI:https://doi.org/10.1103/PhysRevLett.112.061802
© 2014 American Physical Society
Viewpoint
Neutrino Experiments Come Closer to Seeing Violation
Published 10 February 2014
The T2K experiment has measured the largest number of events associated with muon neutrinos oscillating into electron neutrinos, an important step toward seeing violation in neutrino interactions.
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