• Open Access

Disentangling Genuine from Matter-Induced CP Violation in Neutrino Oscillations

José Bernabéu and Alejandro Segarra
Phys. Rev. Lett. 121, 211802 – Published 21 November 2018

Abstract

We prove that, in any flavor transition, neutrino oscillation CP-violating asymmetries in matter have two disentangled components: (i) a CPT-odd T-invariant term, non-vanishing iff there are interactions with matter, and (ii) a T-odd CPT-invariant term, non-vanishing iff there is genuine CP violation. As function of the baseline, these two terms are distinct L-even and L-odd observables to separately test (i) matter effects sensitive to the neutrino hierarchy and (ii) genuine CP violation in the neutrino sector. For the golden νμνe channel, the different energy distributions of the two components provide a signature of their separation. At long baselines, they show oscillations in the low and medium energy regions, with zeros at different positions and peculiar behavior around the zeros. We discover a magic energy E=(0.91±0.01)GeV at L=1300km with vanishing CPT-odd component and maximal genuine CP asymmetry proportional to sinδ, with δ the weak CP phase. For energies above 1.5 GeV, the sign of the CP asymmetry discriminates the neutrino hierarchy.

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  • Received 21 June 2018
  • Revised 4 September 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.211802

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

José Bernabéu and Alejandro Segarra

  • Department of Theoretical Physics, University of Valencia and IFIC, University Valencia—CSIC, Burjassot, 46100 Valencia, Spain

Article Text

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Issue

Vol. 121, Iss. 21 — 23 November 2018

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