CP-Violation in Neutrino Oscillations and L/E Flatness of the E-like Event Ratio at Super-Kamiokande
Abstract
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 unity. Further, it is found that once CP is violated the exact L/E flatness implies: (a) the CP-violating phase, in the standard parametrization, is narrowed down to two possibilities +/-π/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.
- Publication:
-
Modern Physics Letters A
- Pub Date:
- 2002
- DOI:
- 10.1142/S0217732302006138
- arXiv:
- arXiv:hep-ph/0008303
- Bibcode:
- 2002MPLA...17...13A
- Keywords:
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- 14.60.Pg;
- 11.30.Er;
- Charge conjugation parity time reversal and other discrete symmetries;
- High Energy Physics - Phenomenology
- E-Print:
- Published version