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2012

Cosmic Neutrino Flavor Ratios with Broken $\nu_\mu-\nu_\tau$ Symmetry

Fu, Lingjun, Ho, Chiu Man, Weiler, Thomas J.

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Reactor neutrino experiments have now observed a nonzero value for $\theta_{13}$ at $5\sigma$, and global fits to data imply a nonzero value above $10\sigma$.

Nonzero values for $\theta_{13}$ and/or $\theta_{32}-\pi/4$ break a $\nu_\mu-\nu_\tau$ symmetry, which has qualitative as well as quantitative implications for the time-evolution of neutrino flavors.
In particular, the large-distance flavor evolution matrix, non-invertible with $\nu_\mu-\nu_\tau$ symmetry, is now invertible.
This means that measurements of neutrino flavor ratios at Earth can now be inverted to directly reveal the flavor ratios injected at cosmically distant sources.

Cosmic Neutrino Flavor Ratios with Broken $\nu_\mu-\nu_\tau$ Symmetry · Around

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P. Lipari, M. Lusignoli and D. Meloni, “Flavor Composition and Energy Spectrum of Astrophysical Neutrinos,” Phys. Rev. D 75
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S. F. King, “Parametrizing the lepton mixing matrix in terms of deviations from tri-bimaximal mixing,” arXiv:0710.0530 [hep-ph]; S. Pakvasa, W. Rodejohann and T. J. Weiler, “Unitary parametrization of perturbations to tribimaximal neutrino mixing,” Phys. Rev. Lett. 100
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S. Hummer, M. Maltoni, W. Winter and C. Yaguna, Astropart. Phys. 34
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Then

M. Ishitsuka (Double Chooz), Talk presented at XXV International Conf. on Neutrino Physics
2012
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J. Beringer et al
2012
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D. V. Forero, M. Tortola and J. W. F. Valle, “Global status of neutrino oscillation parameters after Neutrino-2012,” arXiv:1205.4018 [hep-ph]
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