CP violation in neutrino oscillations and L/E flatness of the e-like event ratio at Super-Kamiokande

Details CP violation in neutrino oscillations and L/E flatness of the e-like event ratio at Super-Kamiokande CP violation in neutrino oscillations and L/E flatness of the e-like event ratio at Super-Kamiokande

2000-08-29

arxiv.org/abs/hep-ph/0008303v2

Mod. Phys. Lett. A 17, 13-21 (2002)

Physics

High Energy Physics

High Energy Physics - Phenomenology

Published version

Scientific paper

10.1142/S0217732302006138

We show that if the presently observed L/E-flatness of the electron-like event ratio in the Super-Kamiokande atmospheric neutrino data is confirmed then the indicated ratio must be {\em unity}. Further, it is found that once CP is violated the exact L/E flatness implies: (a) The CP-violating phase, in the standard parameterization, is narrowed down to two possibilities pm pi/2, and (b) The mixing between the second and the third generations must be maximal. With these results at hand, we argue that a dedicated study of the L/E-flatness of the electron-like event ratio by Super-Kamiokande can serve as an initial investigatory probe of CP violation in the neutrino sector. The assumptions under which these results hold are explicitly stated.

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