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Probing CP violation in neutrino oscillations with neutrino telescopes · Around

2007

Probing CP violation in neutrino oscillations with neutrino telescopes

Blum, Kfir, Nir, Yosef, Waxman, Eli

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Measurements of flavor ratios of astrophysical neutrino fluxes are sensitive to the two yet unknown mixing parameters $\theta_{13}$ and $\delta$ through the combination $\sin\theta_{13}\cos\delta$.

We extend previous studies by considering the possibility that neutrino fluxes from more than a single type of sources will be measured.
We point out that, if reactor experiments establish a lower bound on $\theta_{13}$, then neutrino telescopes might establish an upper bound on $|\cos\delta|$ that is smaller than one, and by that prove that CP is violated in neutrino oscillations.
Such a measurement requires several favorable ingredients to occur: (i) $\theta_{13}$ is not far below the present upper bound; (ii) The uncertainties in $\theta_{12}$ and $\theta_{23}$ are reduced by a factor of about two; (iii) Neutrino fluxes from muon-damped sources are identified, and their flavor ratios measured with accuracy of order 10% or better.

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